|
|
|
| Potential failure paths of fractured rock slope based on synthetic rock mass(SRM) method |
| ZHAO Weihua，HUANG Runqiu |
(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection，Chengdu University of Technology，
Chengdu，Sichuan 610059，China)
|
|
|
|
|
Abstract The deformation failure mode of fractured rock slope is actually determined by the potential paths controlled by the structural characteristics of rock mass. In the complex fractured rock slopes，the intersections of structural planes with different types，sizes and dip angles make the damage paths more uncertain. The method of synthetic rock mass(SRM) can achieve effectively the structurally controlled sliding damage. A complex fractured high rock slope at a hydropower station in southwest China is studied in this paper with the method. The SRM developed with the Particle Discrete Element PFC software is adopted to solve a series of technical problems，including the construction of a complex discrete fracture network model in different sizes and dip angles based on the non-uniform distribution of homogeneous zones，the construction of rock material models with different geological properties considering the range of particle size effects，and the calculation of the potential failure paths of fractured rocky high slope simulated by SRM and combined with the weight increasing method. The results indicate that the potential failure paths of the slopes are mainly step-shaped and formed due to steep-dip faults，dykes，or joints，and gentle-to-middle dip joints. The potential failure paths are dominated by the shallow local shear-tension instability mode.
|
|
|
|
|
|
[1] PRIEST S D，HUDSON J A. Estimation of discontinuity spacing and trace length using scanline surveys[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1981，18(3)：183–197.
[2] BAECHER G B，LANNEY N A，EINSTEIN H H. Statistical description of rock properties and sampling[C]// The 18th U.S. Symposium on Rock Mechanics(USRMS). Colorado：Colorado School of Mines Press，1977：5C1–1–5C1–8
[3] 汪小刚，贾志欣，张发明，等. 岩体结构面网络模拟原理及其工程应用[M]. 北京：中国水利水电出版社，2010：1–16.(WANG Xiaogang，JIA Zhixin，ZHANG Faming，et al. The simulation of rock joint network and its application[M]. Beijing：China Water Power Press，2010：1–16.(in Chinese))
[4] 陈剑平. 岩体随机不连续面三维网络数值模拟技术[J]. 岩土工程学报，2001，23(4)：397–402.(CHEN Jianping. 3D net work numerical modeling technique for random discontinuities of rock mass[J]. Chinese Journal of Geotechnical Engineering，2001，23(4)：397–402.(in Chinese))
[5] 贾洪彪，唐辉明，刘佑荣，等. 岩体结构面三维网络模拟理论与工程应用[M]. 北京：科学出版社，2008：76–110.(JIA Hongbiao，TANG Huiming，LIU Yourong，et al. Theory and engineering application of 3D network modeling of discontinuities in rockmass[M]. Beijing：Science Press，2008：76–110.(in Chinese))
[6] 章广成. 复杂裂隙岩体等效应力参数研究及工程应用研究[博士学位论文][D]. 武汉：中国地质大学，2008.(ZHANG Guangcheng. Study on the equivalent mechanical parameters of complicated fractured rock mass and their engineering application[Ph. D. Thesis][D]. Wuhan：China University of Geoscience，2008.(in Chinese))
[7] PIERCE M，CUNDALL P，POTYONDY D，et al. A synthetic rock mass model for jointed rock[C]// Rock Mechanics：Meeting Society?s Challenges and Demands，1st Canada-U.S. Rock Mechanics Symposium. Vancouver，Canada：[s. n.]，2007：341–349.
[8] PIERCE M E，FAIRHURST C. Synthetic rock mass applications in mass mining[C]// QIAN Q，ZHOU Y ed. Proceedings of the 12th ISRM International Congress. London：Taylor and Francis Group，2012：109–114.
[9] SCHOLTES L，DONZE F V. Modelling progressive failure in fractured rock masses using a 3D discrete element method[J]. International Journal of Rock Mechanics and Mining Sciences，2012，52(6)：18–30.
[10] ELMO D，STEAD D. An integrated numerical modelling-Discrete Fracture Network approach applied to the characterization of rock mass strength of naturally fractured pillars[J]. Rock Mechanics and Rock Engineering，2010，43(1)：3–19.
[11] MERRIEN-SOUKATCHOFF V，KORINI T，THORAVAL A. Use of an integrated discrete fracture network code for stochastic stability analyses of fractured rock masses[J]. Rock Mechanics and Rock Engineering，2012，45(2)：159–181.
[12] 郭运华，朱维申，王知深，等. 断续节理岩体渐进破坏数值模拟方法及等效力学参数的测定[J]. 岩石力学与工程学报，2014，33(9)：1 798–1 805.(GUO Yunhua，ZHU Weishen，WANG Zhishen，et al. Numerical simulation of progressive failure of intermittent jointed rock mass to determine equivalent mechanical parameters[J]. Chinese Journal of Rock Mechanics and Engineering，2014，33(9)：1 798–1 805. (in Chinese))
[13] 赵 伟，吴顺川，高永涛，等. 节理岩体数值模拟及力学参数确定[J]. 工程科学学报，2015，37(12)：1 542–1 549.(ZHAO Wei，WU Shunchuan，GAO Yongtao，et al. Numerical modeling and mechanical parameters determination of jointed rock mass[J]. Chinese Journal of Engineering，2015，37(12)：1 542–1 549.(in Chinese))
[14] 周 喻，韩 光，吴顺川，等. 断续节理岩体及岩质边坡破坏的细观机制[J]. 岩石力学与工程学报，2016，35(增2)：3 878–3 889. (ZHOU Yu，HAN Guang，WU Shunchuan，et al. Meso failure mechanism of rock mass and slope with intermittent joints[J]. Chinese Journal of Rock Mechanics and Engineering，2016，35(Supp.2)：3 878– 3 889.(in Chinese))
[15] LEI Q H，LATHAM J P，TSANG C F. The use of discrete fracture networks for modelling coupled geomechanical and hydrological behavior of fractured rocks[J]. Computers and Geotechnics，2017，85：151–176.
[16] 葛云峰，唐辉明，王亮清，等. 大数量非贯通节理岩体离散元数值模拟实现方法研究[J]. 岩石力学与工程学报，2017，36(增2)：3 760– 3 773.(GE Yunfeng，TANG Huiming，WANG Liangqing，et al. Realization method of discrete element numerical simulation of large number of non- persistent jointed rock mass[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.2)：3 760–3 773.(in Chinese))
[17] PIERCE M，MAS IVARS D，CUNDALL P，et al. A synthetic rock mass model for jointed rock[C]// Proceedings of the 1st Canada-U.S. Rock Mechanics Symposium. Vancouver，Canada：[s. n.]，2007：341–349.
[18] REYES-MONTERS J M，PETTITT W S，YOUNG R P. Validation of a synthetic rock mass model using excavation induced microseismicity[C]// Proceedings of the 1st Canada-U.S. Rock Mechanics Symposium. Vancouver，Canada：[s. n.]，2007：365–369.
[19] VALLEJOS J，BRZOVIC A，LOPEZ C，et al. Application of the synthetic rock mass approach to characterize rock mass behavior at the EI Teniente Mine，Chile[C]// Proceeding of the 3rd International FLAC/DEM Symposium. Hangzhou，China：[s. n.]，2013：1–15.
[20] IVARS D M，PIERCE M E，DARCEL C，et al. The synthetic rock mass approach for jointed rock mass modelling[J]. International Journal of Rock Mechanics and Mining Science，2011，48(2)：219– 244.
[21] 王树林，陈剑平，石丙飞. 岩体随机结构面三维网络数值模型有效性检验[J]. 工程地质学报，2004，12(2)：177–181.(WANG Shulin，CHEN Jianping，SHI Bingfei. Verification of random 3D fractures network model of rock mass[J]. Journal of Engineering Geology，2004，12(2)：177–181.(in Chinese))
[22] BAHAADDINI M，HAGAN P C，MITRA R，et al. Parametric Study of Smooth Joint Parameters on the Shear Behaviour of Rock Joints[J]. Rock Mechanics and Rock Engineering，2015，48(3)：923–940.
[23] LAMBERT C，COLL C. Discrete modeling of rock joints with a smooth-joint contact model[J]. Journal of Rock Mechanics and Geotechnical Engineering，2013，6(1)：1–12.
[24] CUNDALL P A，PIERCE M，MAS IVARS D. Quantifying the size effect of rock mass strength[C]/ /POTVIN Y，CARTER J，DYSKIN A，et al，ed. Proceedings of the 1st South Hemisphere International Rock Mechanics Symposium(SHIRMS). Nedlands：Australian Centre for Geomechanics，2008：3–15.
[25] DING X，ZHANG L. A new contact model to improve the simulated ratio of unconfined compressive strength to tensile strength in bonded particle model[J]. International Journal of Rock Mechanics and Mining Sciences，2014，69(3)：111–119.
[26] DING X，ZHANG L，ZHU H，et al. Effect of model scale and particle size distribution on PFC3D simulation results[J]. Rock Mechanics and Rock Engineering，2014，47(6)：1–18.
[27] 尹小涛，郑亚娜，马双科. 基于颗粒流数值试验的岩土材料内尺度比研究[J]. 岩土力学，2011，32(4)：1 211–1 215.(YIN Xiaotao，ZHENG Yana，MA Shuangke. Study of inner scale ratio of rock and soil material based on numerical tests of particle flow code[J]. Rock and Soil Mechanics，2011，32(4)：1 211–1 215.(in Chinese))
[28] 王晓卿. 节理煤体模型重构及其力学响应特征研究[博士学位论文][D]. 北京：中国矿业大学，2017.(WANG Xiaoqing. Jointed coal mass model reconstruction and its mechanical response characteristics[Ph. D. Thesis][D]. Beijing：China University of Mining and Technology，2017.(in Chinese))
[29] WANG C，TANNANT D，LILLY P A. Numerical analysis of the stability of heavily jointed rock slopes using PFC2D[J]. International Journal of Rock Mechanics and Mining Sciences，2003，40(3)：415–424.
[30] 贺续文. 基于离散单元法的节理岩体边坡稳定性分析[硕士学位论文][D]. 长沙：湘潭大学，2010.(HE Xuwen. Numerical analysis of the stability of jointed rock slopes based on DEM[M. S. Thesis][D]. Changsha：Xiangtan University，2010.(in Chinese))
[31] 岑夺丰，黄 达，黄润秋. 岩质边坡断续裂隙阶梯状滑移模式及稳定性计算[J]. 岩土工程学报，2014，36(4)：695–706.(CEN Duofeng，HUANG Da，HUANG Runqiu. Step-path failure mode and stability calculation of jointed rock slopes[J]. Chinese Journal of Geotechnical Engineering，2014，36(4)：695–706.(in Chinese)) |
|
|
|
2018, Vol. 37 
