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  • 1. Baghbanan, A.
    et al.
    Sookhak, A.
    Hashemalhosseini, H.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Block stability analysis around a large cavern using probabilistic approach2010Inngår i: Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst - Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009, 2010, s. 435-440Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Block stability analysis around a large excavation is analyzed with both Probabilistic Kinematics Limit Equilibrium (PKLE) and Discrete Fracture Network-Distinct Element Method (DFNDEM) approaches. Different combination of geometric parameters of fracture sets are selected in PKLE method and a series of numerical DEM modeling are performed on generated and validated DFN models in DFN-DEM approach to measure volume of potential unstable blocks and also minimum required support patterns. The mean volume of unstable blocks for PKLE with limited joint length assumption is fairly close to DFN models and they are far from mean value of PKLE when the joint length is extended infinitely. The minimum required support pattern for PKLE is smaller than DEM models which means that the PKLE design tool is underestimated compared with DFN-DEM method which benefits more realistic conceptual model and facilitates more sophisticate simulation tool.

  • 2.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Block stability analysis using deterministic and probabilistic methods2011Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    This thesis presents a discussion of design tools for analysing block stability around a tunnel. First, it was determined that joint length and field stress have a significant influence on estimating block stability. The results of calculations using methods based on kinematic limit equilibrium (KLE) were compared with the results of filtered DFN-DEM, which are closer to reality. The comparison shows that none of the KLE approaches– conventional, limited joint length, limited joint length with stress and probabilistic KLE – could provide results similar to DFN-DEM. This is due to KLE’s unrealistic assumptions in estimating either volume or clamping forces.

    A simple mechanism for estimating clamping forces such as continuum mechanics or the solution proposed by Crawford-Bray leads to an overestimation of clamping forces, and thus unsafe design. The results of such approaches were compared to those of DEM, and it was determined that these simple mechanisms ignore a key stage of relaxation of clamping forces due to joint existence. The amount of relaxation is a function of many parameters, such as stiffness of the joint and surrounding rock, the joint friction angle and the block half-apical angle.

    Based on a conceptual model, the key stage was considered in a new analytical solution for symmetric blocks, and the amount of joint relaxation was quantified. The results of the new analytical solution compared to those of DEM and the model uncertainty of the new solution were quantified.

    Further numerical investigations based on local and regional stress models were performed to study initial clamping forces. Numerical analyses reveal that local stresses, which are a product of regional stress and joint stiffness, govern block stability. Models with a block assembly show that the clamping forces in a block assembly are equal to the clamping forces in a regional stress model. Therefore, considering a single block in massive rock results in lower clamping forces and thus safer design compared to a block assembly in the same condition of in-situ stress and properties.

    Furthermore, a sensitivity analysis was conducted to determine which is  the most important parameter by assessing sensitivity factors and studying the applicability of the partial coefficient method for designing block stability.

    It was determined that the governing parameter is the dispersion of the half-apical angle. For a dip angle with a high dispersion, partial factors become very large and the design value for clamping forces is close to zero. This suggests that in cases with a high dispersion of the half-apical angle, the clamping forces could be ignored in a stability analysis, unlike in cases with a lower dispersion. The costs of gathering more information about the joint dip angle could be compared to the costs of overdesign. The use of partial factors is uncertain, at least without dividing the problem into sub-classes. The application of partial factors is possible in some circumstances but not always, and a FORM analysis is preferable.

  • 3.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Model uncertainty of design tools to analyze block stability2009Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Block failure is one of the most common failure modes in tunnels. Design tools have some simplifications and, therefore, they also have some model uncertainties. The purpose of this licentiate thesis is to assess the model uncertainty for different design tools in order to estimate block stability.

    Different approaches of kinematic limit equilibrium (KLE) including conventional KLE, limited joint length, limited joint length and stress field consideration and probabilistic KLE were compared to that of DFN-DEM. In this approach, the results of the calibrated DFN-DEM with field mapping were considered to be of true value. The results show that the conventional KLE is overdesign due to it’s over simplification. By considering fracture length and stress field, the volume of predicted unstable blocks is reduced. The probabilistic approach of KLE by considering finite joint length and stress field predicts the volume of unstable blocks to be lower than DFN-DEM approach. Therefore there is a great model uncertainty of our standard design tools for block stability analysis.

    The assumption made in this study is that the results from DEM were considered to have a true value; the results from analytical solution based on joint relaxation process were compared to those of DEM in a different condition of depth, K0, apical and friction angle, Kn and Ks value, and ratio of Kn/Ks. The comparison shows that for shallow depth with K0 less than 1, analytical solution leads to an overestimation of block stability. The analytical solution predicts that the block is stable, while the analyses from numerical solution show the block is unstable. The analyses show that by increasing K0, accuracy of analytical solution also increases. Moreover, for the cases with close value of friction angle to semi-apical angle, the use of analytical solution is not recommended. As the ratio of Kn/Ks increases, the accuracy of analytical solution decreases. Increasing the angle ratio (ratio between semi-apical angle to friction angle) is one source of increasing uncertainty in the model. The analytical solution is very uncertain in cases with a low value of K0, and a high value of stiffness ratio and angle ratio. On the other hand, the analytical solution is more certain in conditions with a high value of K0 and a low value of stiffness ratio and angle ratio. According to current information (K0, angle ratio, stiffness ratio), one can determine the value of model uncertainty by using the diagrams presented in Chapter 6 of the thesis. The analyses show that by having more information about the key parameters, the model uncertainty could be identified more precisely. However, having more information means spending more money, and this increase in cost must be compared to the cost of failure or delay in the project or overdesign.

     

     

  • 4.
    Bagheri, Mehdi
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap.
    Baghbanan, Alireza
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap.
    Some aspects on model uncertainty in the calculation of block stability using Kinematics Limit Equilibrium2008Inngår i: 42nd U.S. Rock Mechanics - 2nd U.S.-Canada Rock Mechanics Symposium, American Rock Mechanics Association , 2008Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Kinematics Limit Equilibrium (KLE) is one of the most commonly used approaches for evaluating block stability around underground openings. Model uncertainty in using (probabilistic) KLE has been assessed by comparing block stability results with the results of the Discrete Fracture Network-Distinct Element Method (DFN-DEM) approach. The KLE analysis has been performed based on Monte Carlo random generation for fracture orientations and lengths (probabilistic KLE). The results show that the probabilistic KLE underestimates the unstable block volume. The calculated mean value of unstable block volumes using probabilistic KLE is much smaller than DFN-DEM simulation results, which provide a closer representation of reality.

  • 5.
    Bagheri, Mehdi
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Shafiezadeh, N
    Continuum Modeling of Masjed E Soleyman Power House Cavern using an Empirical Continuum Media2006Inngår i: ARMA's Golden Rocks 2006 - 50 Years of Rock Mechanics, 2006Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Numerical modeling is a useful tool to design underground openings. Masjed ESoleyman Power House Cavern is one of the largest caverns in the Middle East. Ramamurthy introduced an empirical equivalent media in 1994. Ramamurthy Equivalentmedia was applied to a Finite element analysis. Phase2D software was used to analyzecontinuum media. The displacements obtained from Equivalent continuum analysis were compared to those measured by MultiPoint Borehole Extensometers (MPBX). 

  • 6.
    Bagheri, Mehdi
    et al.
    Iran Water and Power Development Co.
    Shafiezadeh, N
    Hajihassani, H.R.
    Discontinuum and Continuum Modeling of Masjed E Soleyman Power House Cavern2006Inngår i: Proceedings of the International Symposium of the International Society for Rock Mechanics, Eurock 2006: Eurock 2006 Multiphysics Coupling and Long Term Behaviour in Rock Mechanics, 2006, s. 689-693Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Numerical modelling is a useful tool to design underground openings. Masjed E Soleyman Power House Cavern is one of the largest caverns in the Middle East. Continuum and discontinuum analyses were performed to evaluate the stability of the cavern. Phase2D and UDEC softwares were used to analyse for continuum and discontinuum media respectively. The displacements obtained from continuum and discontinuum analyses were compared to those measured by Multiple Borehole Extensometers (MPBX).

  • 7.
    Bagheri, Mehdi
    et al.
    Iran Water and Power Development Co.
    Shafiezadeh, S
    Evaluation of Rock Mass Modulus by Ramamurthy Equivalent Media - A Case Study of Masjed Soleyman Cavern2006Inngår i: Proceedings of the International Symposium on Dams in the Societies of the 21st Century, ICOLD-SPANCOLD: Dams and Reservoirs, Societies and Environment in the 21st Century, 2006, s. 731-735Konferansepaper (Fagfellevurdert)
    Abstract [en]

    In situ rock mass modulus is one of the most important parameters for designing the underground excavations. Rock Mass modulus can be determined by rock massclassification, equivalent media approach or by performing of in-situ tests. Ramamurthyequation has been applied to the numerical code, Flac, to evaluate rock mass modulussurrounding Masjed Soleyman Power House Cavern. The results have been compared to those obtained from back analysis and equations based on rock mass classification. This comparison indicates that the rock mass modulus obtained from Ramamurthyequations is more reliable than those obtained from equations based on rock massclassification. Another advantage of the Ramamurthy equivalent media is the possibility of distinguishing the variations of modulus due to the excavating. It is suggested that by helping of a numerical code and Ramamurthy equivalent media the variation of moduluscan be observed during different stages of excavation.

  • 8.
    Bagheri, Mehdi
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    A new analytical solution based on joint relaxation for analyzing symmetrical block stability2013Inngår i: International Journal for Numerical and analytical in geomechanics,, ISSN 0363-9061, Vol. 37, nr 8, s. 771-786Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The magnitude of clamping forces has a significant influence on the estimated ultimate pullout force of a block. The Crawford–Bray equation, which is fundamental in considering clamping forces, is only a function of horizontal stress and block height. Further research to incorporate the influence of induced stress in block stability analysis was considered, but all the previous analytical solutions for analyzing block stability assume a continuum medium to estimate clamping forces and do not allow joint deformations to occur before block movement due to gravity. Assuming a continuous medium to estimate clamping forces leads to an overestimation of block stability and therefore unsafe design. In this paper, an attempt has been made to deepen the understanding of the block failure mechanism and correct the estimated magnitude of clamping forces in a discontinuous medium. A conceptual model is proposed based on the loading–unloading of the block from an in-situ state to failure. Based on this model, an analytical solution has been developed that calculates clamping forces in a discontinuous medium. The validity and model uncertainty of the solution were checked for different conditions. The new analytical solution is both precise and accurate and can be used as a design tool to estimate block stability.

  • 9.
    Bagheri, Mehdi
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Application of partial factors to block stability analysisInngår i: Georisk: Assessment and Management of Risk for Engineered Systems and Geohazards, ISSN 1749-9518, E-ISSN 1749-9526Artikkel i tidsskrift (Annet vitenskapelig)
  • 10.
    Bagheri, Mehdi
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Investigation of model uncertainty for block stability analysis2011Inngår i: International journal for numerical and analytical methods in geomechanics (Print), ISSN 0363-9061, E-ISSN 1096-9853, Vol. 35, nr 7, s. 824-836Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The application of probabilistic design, such as FORM, is expanding rapidly in the design of geotechnical structures. The analytical solution proposed by Crawford and Bray for analyzing block stability can be used as a performance function to carry out probabilistic design. The solution benefits from considering both clamping forces and joint stiffness. However, imperfect assumptions and simplifications in the solution generate model uncertainties. The amount of model uncertainty must be considered in order to assess a reliable design. The purpose of this paper is to identify when the analytical solution is applicable and quantify the model uncertainty of the solution. The amount of model uncertainty for the analytical solution has been assessed for different conditions. The results show that at a shallow depth with a low value of in situ stress ratio (horizontal stress/vertical stress), the analytical solution predicts that the block is stable whereas DEM shows that the block is unstable. The results of the analyses indicate that in cases with low stress ratio, cases with high anisotropy of joint stiffness or the case of a semiapical angle close to the friction angle, the accuracy of the analytical solution is low. Neglecting key parameters, such as the absolute value of joint shear and normal stiffness, vertical in situ stress and its influence on joint relaxation generate model uncertainty in the analytical solution. The analyses show that by having more information about the key parameters, the model uncertainty factor could be identified more precisely.

  • 11.
    Bagheri, Mehdi
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Some Aspects of Model Uncertainties of Block Stability Estimation2008Inngår i: ARMS 2008, Teheran, 2008, s. 675-681Konferansepaper (Fagfellevurdert)
  • 12.
    Johansson, Fredrik
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Variation of mechanical parameters of a slightly weathered joint in granite estimated from fourteen shear tests2010Inngår i: ROCK MECHANICS IN CIVIL AND ENVIRONMENTAL ENGINEERING, 2010, s. 223-226Konferansepaper (Fagfellevurdert)
    Abstract [en]

    Describing the mechanical parameters of a rock joint with single values is difficult since rock has a natural spatial variation. In addition to this, the interpretation of the results is dependent on the number of tests. Despite this fact, input data for these parameters are often given with a deterministic value. This paper presents the results of fourteen shear tests tested under a constant normal stress of approximately 0.8 MPa. The samples were taken from a slightly weathered rock joint in granite. Basic friction angle and dilation angle, together with shear and normal stiffness, are evaluated. Based on the results, mean values and standard deviations together with coefficient of variations for the different parameters are presented. After that, different statistical distributions for the parameters are compared. Finally, the results are compared against calculated values derived from commonly used equations.

  • 13. Nord, Gunnar
    et al.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Baghbanan, Alireza
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Mark- och vattenteknik (flyttat 20130630).
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Design consideration of large caverns by using advanced drilling equipment2007Inngår i: Felsbau, ISSN 0174-6979, Vol. 25, nr 5, s. 131-136Artikkel i tidsskrift (Fagfellevurdert)
  • 14. Nord, Gunnar
    et al.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Cavern Design Consideration with Modern Drilling Equipment2006Inngår i: Rock Mechanics in Underground Construction / [ed] C.F. Leung; Y.X. Zhou, 2006Konferansepaper (Fagfellevurdert)
  • 15. Shafiezadeh, N.
    et al.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Parametric Study on the Friction Angle and Dilatation of Angle of Intact Rock and Discontinuities presented in the Siah Bisheh Pumping Storage Hydro-Electric Power Project (HEPP)2006Inngår i: / [ed] Van Cotthem, Charlier, Thimus & Tsibangu, Taylor & Francis Group, 2006, s. 637-642Konferansepaper (Fagfellevurdert)
  • 16. Shafiezadeh, N.
    et al.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Parametric study on the friction angle and dilation angle of intact rock and discontinuities presented in the Siah Bisheh pumping storage hydro-electric power project (HEPP)2006Inngår i: Proc. Int. Symp. Int. Soc. Rock Mech., Eurock - Eurock Multiphysics Coupling Long Term Behav. Rock Mech., 2006, s. 637-642Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The values of friction angle and dilation angle of rock mass are the effective factors on the visco-elastic displacements around underground structures. The present parametric study was conducted to determine the effect of dilation angle of discontinuities and intact rock, friction angle of discontinuities on the values of visco-elastic displacements based on non-associated flow rule and elasto-viscoplastic theory and statistical Yates method. Elasto-visco plastic analyses of Siah Bisheh Power Cavern have been performed according to non-associated flow rule by FESTO3. In the Yates method, the direct effect and interaction of the concerned parameters on displacements and sensitivity of effects are considered. On the basis of the results, an optimum value can be chosen for the studied parameter. It is found that, the variation of the dilation angle of intact rock and friction angle of discontinuities induced similar variation in the values of displacements, but the sensitivity of these variations is not noticeable. Therefore it is concluded that these parameters are not much effective on the result (visco-plastic displacements). However, changing the dilation angle of discontinuities caused considerable variation in the visco-plastic displacements indicating a direct effect of this parameter on the results. To find out the optimum value of this parameter, the effect of it's variation on the visco-plastic displacement around the cavern is discussed.

  • 17. Sookhak, A.
    et al.
    Baghbanan, A.
    Hashemalhosseini, H.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    UDEC simulation of block stability analysis around a large cavern2010Inngår i: Analysis Of Discontinuous Deformation: New Developments And Applications, Research Publishing Services, 2010, s. 445-452Konferansepaper (Fagfellevurdert)
  • 18.
    Stille, Håkan
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Zetterlund, Miriam
    Pérez, Kelvis
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    The observational method2010Rapport (Annet vitenskapelig)
  • 19.
    Yaghoobi Rafi, Jalaleddin
    et al.
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Stille, Håkan
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Bagheri, Mehdi
    KTH, Skolan för arkitektur och samhällsbyggnad (ABE), Byggvetenskap, Jord- och bergmekanik.
    Applying Real Time Grouting Control Method in Sedimentary Rock2012Inngår i: Grouting and deep mixing: proceedings of the fourth International Conference on Grouting and Deep Mixing, February 15-18, 2012, New Orleans, Louisiana, American Society of Civil Engineers (ASCE), 2012, s. 1450-1459Konferansepaper (Fagfellevurdert)
    Abstract [en]

    We report on preliminary studies of low (14 at.%) and high (53at.%) concentration Mn doped MgO films deposited by co-sputtering from metallic Mn and Mg targets. The structural, surface morphologies and magnetic properties of the films of different thickness were studied. All the as grown films are found to be amorphous and film surfaces are found to be flawless and homogeneous. We observe at room temperature robust ferromagnetic loops with a saturation magnetization value that is a function of film thickness reaching a maximum of ≃38.5 emu/cm3 in the Mn0.53Mg0.47O film at a thickness of ≃92 nm. In thicker films room-temperature ferromagnetic ordering is suppressed and eventually at a thickness around 120nm the expected diamagnetism of the bulk appears. The origin of ferromagnetism may be attributed to cation defects at the Mg-site.

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