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It is of great significance to study the progressive failure mechanisms of rock masses which contain pre-existing discontinuous by introducing the discrete element method for analyzing the stability of the engineering rock mass.Considering characteristics of progressive failure of rock bridge,an attenuation law of virtual joint cohesion parameters is proposed through introducing the stress intensity factor.In order to simulate the initiation and propagation processes of discontinuous joints in direct shear tests under different normal stresses,the law programmed in Fish language,is plugged into UDEC.Virtual joints are preset in deformable rock masses,providing potential paths for block failure and fracture propagation.Coinciding well with experimental results,numerical results of the Mohr-Coulomb(MC)joint constitutive models show that the proposed method can simulate the failure process of rock mass accurately and effectively,which reflects the dynamic progress of initiation,extending and connecting of joints inside rock mass.
[1]朱维申,何满潮.复杂条件下围岩稳定性与岩体动态施工力学[M].北京:科学出版社,1995.
[2]黄醒春,周斌,顾超.任意多裂纹应力强度因子的位移不连续数值算法[J].岩土工程学报,2001,23(3):370-373.
[3]Shi G H.Discontinuous Deformation Analysis:A New Numerical Model for the Static and Dynamics of Block Systems[D].Berkeley:University of Califonria,1988.
[4]KE T C.Simulated Testing of Two Dimensional Heterogeneous and Discontinuous Rock Nlasses Using Discontinuous Deformation Analysis[D].Berkeley:United States,University of Califomia l993.
[5]Kemeny J.Time-dependent Drift Degradation Due to the Progressive Failure of Rock Bridges Along Discontinuities[J].International Journal of Rock Mechanics&Mining Sciences,2005,42:35-46.
[6]王桂尧,孙宗颀,徐纪成.岩石Ⅱ型断裂韧度的实验方法[J].中国有色金属学报,1999,9(1):175-179.
[7]Rooke D P,Cartwright D J.Compendium of Stress Intensity Factors[M].Procurement Executive,Ministry of Defence,1976.
[8]夏才初,许崇帮.非连续变形分析(DDA)中断续节理扩展的模拟方法研究和试验验证[J].岩石力学与工程学报,2010,29(10):2 027-2 033.
[9]唐辉明,晏同珍.岩体断裂力学理论与工程应用[M].武汉:中国地质大学出版社,1993.
[10]任伟中,王庚荪,白世伟,等.共面闭合断续节理岩体的直剪强度研究[J].岩石力学与工程学报,2003,22(10):1 667-1 672.
[11]刘远明.基于直剪试验的非贯通节理岩体扩展贯通研究[D].上海:同济大学,2007.
Basic Information:
DOI：10.20040/j.cnki.1000-7709.2013.11.016
China Classification Code:TU452
Citation Information:
[1]FU Mengmeng,YANG Rui,CHEN Haixia ,et al.Discrete Element Analysis of Progressive Failure Mechanisms of Discontinuous Joints[J].Water Resources and Power,2013,31(11):57-60.DOI:10.20040/j.cnki.1000-7709.2013.11.016.
Fund Information:
国家自然科学基金资助项目(51179137)
2013-11-25
2013-11-25