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测面后则立即发展至与x轴平行状态,洞顶围岩中主应力方向发生较大变化. 2.2 应力差变化规律 洞壁围岩裂隙生成及屈服同时与围岩主应力差相关[20-22],Mohr理论,Mohr-Coulomb准则,最大剪应力准则,Lundborg理论等及室内外试验皆表明:剪应力对岩体破坏具有控制作用,而这一量值变化可用主应力差值进行反映.掌子面推进过程中洞顶及洞壁主应力差变化如图11所示. 图11......
sample 图4 不同围压下压缩后的试件 Fig. 4 Samples after biaxial test simulations under different confining pressures 图5 压缩试验的莫尔圆及强度包络线 Fig. 5 Mohr circles corresponding to biaxial test......
; (9) 式中:为围压为时的内摩擦角；为关系曲线上的斜率,反映了强度随着围压的降低；为大气压.由式(8)和式(9)整理得到的强度指标如表4所示. 图9 相同孔隙率和相对密度试样的莫尔圆和强度包线 Fig. 9 Mohr circles at failure and strength envelops of samples......
of equivalent Mohr-Coulomb strength parameters. A class of 3D admissible rotational failure mechanisms is selected for soil slopes including three types of failure mechanisms: face failure, base failure, and toe... criterion; limit analysis; stability; critical slip surface 1 Introduction The linear Mohr-Coulomb (MC) failure criterion is always used in the traditional methods for stability analysis of earth slopes......
. As the unstable sliding body typically satisfies Mohr–Coulomb (M–C) strength criterion, the relationship between the shear force Si and normal force Ni is given as ......
hydrostatic in-situ stress have been presented. All of these solutions include simplifying assumptions, and commonly assume the rock mass governed by either the linear Mohr-Coulomb (M-C) [1-3] or non-linear... analytical solutions can be obtained from this new solution, and previous analytical solutions that based on the Mohr-Coulomb (M-C) failure criterion are special cases of the new analytical solution......
. 17. The Mohr–Coulomb criterion was applied as a failure criterion for rock masses to solve the model. The geomechanical and creep data used for numerical modeling are given in Tables 5 and 6......
monitoring area) 图11 莫尔圆变化情况 Fig. 11 Changing condition of mohr’s circle 3.2.2 随盾构掘进主应力轴偏转角度变化 选取4个测量区域(见图4)对盾构掘进引起土体主应力轴偏转角度发生变化的情况进行分析.由于式(4)中得到的角度范围仅限于,为对主应力轴偏转角度超过45°的情况进行说明,结合莫尔圆原理将主......
and normal stress have nonlinear relation in geotechnical materials’ failure. Let the Hoek-Brown generalized criterion be written in the Mohr’s plane σn–τn, ... interpretation of the coefficient A can be easily given when the Hoek-Brown criterion is made coincident with Mohr-Coulomb failure criterion, that is ......
, the stress failure envelop of soil may be actually non-linear [30]. When Mohr Coulomb model is applied, model uncertainty exists and affects the CV of c or f. If only the tri-axial test data with σ3......
