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which can be denoted by the symbol Ka. The state of the active stress is called active Rankine state. Figure 5 shows the Mohr circle for the active state of stress. According to the Mohr-Coulomb...) in Fig.4. When σh is increased up to σv, the Mohr circle for this condition is reduced to one point E, as shown in Fig.5. The soil element is under the condition of isotropic compression. If the wall......
to Lcr. 4 Comparison and analysis 4.1 Value of parameter B Strength function, defined by Eq. (5), is associated with Mohr envelope theory. In particular, a similar formula could be derived with using Mohr envelope. The relevant parameters have new significance. A is the scale parameter controlling the magnitude of shear strength. σtm/σci is the shift parameter that controlling the location......
, to be coincident with the Mohr envelope and considering without any loss of generality, τn is positive, it is ... in nonlinear Mohr Envelopes-General considerations. According to BAKER [13], it is necessary to impose the restrictionswhich also satisfies the real experimental data [24–33]. 6 Numerical results......
, a nonlinear empirical strength criterion based on Mohr-Coulomb criterion was proposed in this paper. Through the analysis of triaxial test strength of 11 types of rock materials, the feasibility and validity... adopted in engineering applications, in "Suggested Methods for Failure Criteria", the International Society of Rock Mechanics (ISRM) recommended the use of Drucker-Prager criterion [22], Mohr-Coulomb......
point O and the stresses on boundary 1 are in passive state. The corresponding Mohr’s circle for boundary 1 matching the counterclockwise rotation kinematics is shown in Fig.3. Fig.3 Mohr’s circle......
is shown in Fig.4. Figure 5 presents the models of different dip angles. Fig.4 Blind joints in columnar jointed rock mass and joint structures of model The failure envelope for the Mohr-Coulomb model in 3DEC consists of a Mohr-Coulomb criterion with a tension cutoff. There is a non-associated flow rule for shear failure, and no flow rule for tension failure is considered in this model. The basic......
of the 5th International Joint Conference on Artificial Intelligence. San Francisco: Morgan Kaufmann Publishers Inc, 1977: 584-584. [2] Schmid C, Mohr R, Bauckhage C. Comparing and evaluating interest points[C]//Proceedings of the 6th International Conference on Computer Vision. Washington: IEEE Computer Society, 1998: 230-235. [3] Schmid C, Mohr R, Bauckhage C. Evaluation of interest point detectors......
=mi,广义H-B屈服准则可以表示为: (5) 通过对式(5)求导可得到岩石峰值强度与围压拟合曲线的斜率k. (6) Mohr-Coulomb(M-C)屈服...岩[12],大冶大理岩[13]以及田纳西州大理岩[14]三轴压缩试验数据见表1所示.根据上述岩石三轴试验数据,可通过Mohr圆得到不同围压条件下的摩擦角,进而得到H-B屈服准则参数mi,对上述岩石参数mi与围压关系数据点进行拟合,结果如图1所示.由图1可见:拟合曲线分别为.以及,因此,参数mi与围压关系曲线基本符合负指数关系.因此,采用负指数函数来表征参数mi与围压的关系,即: ......
力；φ为岩体初始内摩擦角；cloc为岩体破损单元的黏聚力；φloc为岩体破损单元的内摩擦角. 1.2 平面模型单元屈服接近度指标Y计算 文献[6]在反映单元材料的非线性特征时引入了屈服接近度的概念,基于Mohr-Coulomb破坏准则(图1),通过应力圆与破坏包络线的关系定义屈服接近度指标Y0. (2) 式中:D1为应力圆心到直线强度包络线的距离；D2为应力圆心与单轴抗拉强度对应点在主应力轴上的距离；d1为应力圆与直线强度包络线的最短距离；d2为最小主应力点与单轴抗拉强度值对应点在主应力轴上的距离. 图1 屈服接近度的Mohr圆示意图 Fig. 1 Sketch map of failure approach degree by method......
文章编号:1004-0609(2016)-08-1763-11 基于应变率效应的岩石动态Mohr-Coulomb准则和Hoek-Brown准则研究 宫凤强1, 2, 3,司雪峰1,李夕兵1, 3,陶 明1 (1. 中南大学 资源与安全工程学院,长沙 410083； 2. 中国矿业大学 深部岩土力学与地下工程国家重点实验室,徐州 221008； 3. 中南大学 高等研究中心,长沙 410083) 摘 要:在考虑强度准则参数粘聚力c,内摩擦角φ和岩石材料常数m随应变率增加而变化的基础上,分别提出了基于应变率效应的岩石动态Mohr-Coulomb准则和Hoek-Brown准则.花岗岩材料在6种围压下的三轴试验结果表明:当应变率从10-4 s-1增加到100 s-1时,粘聚力c和岩石材料常数m均随应变率增加而增加,但是内摩擦角φ则随应变率增加而减小.为此,给出了上述3项参......
