RESEARCH OF AVALANCHE DISASTER NUMERICAL SIMULATION BASED ON GRANULAR DISCRETE ELEMENT METHOD OF HIGH-STEEP SLOPE UNDER SEISMIC LOADS
SHI Chong1，2，WANG Shengnian1，2，LIU Lin1，2
(1. Key Laboratory of Geomechanics and Embankment Engineering，Ministry of Education，Hohai University，Nanjing，Jiangsu 210098，China；2. Institute of Geotechnical Research，Hohai University，Nanjing，Jiangsu 210098，China)
Abstract：Based on analysis of high-steep slope at Jiangping River hydropower project，the block overturning analysis method is used to determine the potential damage zone under seismic loading，and then wave propagation equation and boundary condition equation are derived. The collapse disaster of high-steep slope is studied according to two-dimensional granular flow method. The results show that the stability of slope can be determined by particle trajectories with the collapse hazard analysis of granular discrete element method. Then the path of destruction can be studied. By modifying the properties of boundary particles，the incident seismic wave and transmitting boundary condition can be simulated，so it will maximally simulate the coupling process of loading，rock properties and the development of disaster. It also shows that the development of longitudinal unloading fissures whose dip angle is approximately equal to slope free surface is the controlling factor to the stability of high-steep slope under seismic loads，and local collapse and block instability may occur on the superficial slope. The process of collapse starts from the partial avalanche of surface rock mass when an earthquake occurs，then it extends rapidly along the fissures until it gets up to the upper rock under high-intensity earthquake. The scale of collapse is mainly decided by the depth of development of fissures. Therefore，the proposed method can provide a theoretical basis for the stability study of high-steep slope as well as the disaster prediction.
石 崇1，2，王盛年1，2，刘 琳1，2. 地震作用下陡岩崩塌颗粒离散元数值模拟研究[J]. 岩石力学与工程学报, 2013, 32(s1): 2798-2805.
SHI Chong1，2，WANG Shengnian1，2，LIU Lin1，2. RESEARCH OF AVALANCHE DISASTER NUMERICAL SIMULATION BASED ON GRANULAR DISCRETE ELEMENT METHOD OF HIGH-STEEP SLOPE UNDER SEISMIC LOADS. , 2013, 32(s1): 2798-2805.
[1] 宋胜武，冯学敏，向柏宇，等. 西南水电高陡岩石边坡工程关键技术研究[J]. 岩石力学与工程学报，2011，30(1)：1–22.(SONG Shengwu，FENG Xuemin，XIANG Baiyu，et al. Research on key technologies for high and steep rock slopes of hydropower engineering in Southwest China[J]. Chinese Journal of Rock Mechanics and Engineering，2011，30(1)：1–22.(in Chinese))
[2] 王建钧，曹 净. 岩质陡高边坡稳定性分析方法与治理方案探讨[J]. 岩土工程界，2010，10(12)：57–59.(WANG Jianjun，CAO Jing. The analysis method of high and steep rock slopes and discussion on the treatment scheme[J]. Geotechnical Engineering World，2010，10(12)：57–59.(in Chinese))
[3] 何建平，于远忠. 川中危岩崩塌稳定分析评价[J]. 四川建筑科学研究，2007，33(5)：69–72.(HE Jianping，YU Yuanzhong. Stability analysis and evaluation of the deformed dangerous rock collapsing[J]. Sichuan Building Science，2007，33(5)：69–72.(in Chinese))
[4] 郑颖人，叶海林，黄润秋，等. 地震边坡稳定性分析探讨[C]// 第十一届中国科协年会论文集(2). 北京：中国科学技术协会学会学术部，2009：1 174–1 184.(ZHENG Yingren，YE Hailin，HUANG Runqiu，et al. Study on the stability analysis of earthquake slope[C]// Proceedings of the 11th China Science Association(2). Beijing：Academic Department of China Association for Science and Technology，2009：1 174–1 184.(in Chinese))
[5] 叶海林，黄润秋，郑颖人，等. 地震作用下边坡稳定性安全评价的研究[J]. 地下空间与工程学报，2009，5(6)：1 248–1 257.(YE Hailin，HUANG Runqiu，ZHENG Yingren，et al. The study of safety evaluation on slope seismic stability[J]. Chinese Journal of Underground Space and Engineering，2009，5(6)：1 248–1 257.(in Chinese))
[6] 万 洪，胡春林. 地震荷载作用下岩质边坡稳定性分析[J]. 建材世界，2009，30(3)：106–109.(WAN Hong，HU Chunlin. Rock slope stability analysis under earthquake load[J]. The World of Building Materials，2009，30(3)：106–109.(in Chinese))
[7] 祁生文. 岩质边坡动力反应分析[M]. 北京：科学出版社，2007：77–98.(QI Shengwen. Dynamic response analysis of rock slope[M]. Beijing：Science Press，2007：77–98.(in Chinese))
[8] 史 丹，陈蕴生，韩 信，等. 岩质边坡地震动力稳定性研究进展[J]. 西北农林科技大学学报：自然科学版，2006，34(2)：147–152.(SHI Dan，CHEN Yunsheng，HAN Xin，et al. The evaluation of seismic dynamic stability of rock slope[J]. Journal of Northwest Sci-Tech University of Agriculture and Forestry：Natural Science，2006，34(2)：147–152.(in Chinese))
[9] 刘立平，雷尊宇，周富春. 地震边坡稳定分析方法综述[J]. 重庆交通学院学报，2001，20(3)：83–88.(LIU Liping，LEI Zunyu，ZHOU Fuchun. The evaluation of seismic slope stability analysis methods[J]. Journal of Chongqing Jiaotong University，2001，20(3)：83–88.(in Chinese))
[10] ALLISON R J，KIMBER O G. Modelling failure mechanisms to explain rock slope change along the isle of Purbeck coast，UK[J]. Earth Surface Processes and Landforms，1998，23(8)：731–750.
[11] WANG C，TANANT D 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.
[12] TANG C L，HU J C，LIN M L，et al. The Tsaoling landslide triggered by the Chi-Chi earthquake，Taiwan：INsights from a discrete element simulation[J]. Engineering Geology，2009，106(1/2)：1–19.
[13] 任青文，余天堂. 边坡稳定的块体单元法分析[J]. 岩石力学与工程学报，2001，20(1)：20–24.(REN Qingwen，YU Tiantang. Slope stability analysis with block element method[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(1)：20–24.(in Chinese))
[14] 黄可明，郑鸣芳. 块体系统不连续变形分析(DDA)方法评述[J]. 水利科技，2004，(1)：44–46.(HUANG Keming，ZHENG Mingfang. Review of discontinuous deformation analysis in block system[J]. Hydraulic Science and Technology，2004，(1)：44–46.(in Chinese))
[15] PONT S D，DIMNET E. A theory for multiple collisions of rigid solids and numerical simulation of granular ?ow[J]. International Journal of Solids and Structures，2006，43(20)：6 100–6 114.
[16] 李新坡，何思明. 节理岩质边坡破坏过程的PFC2D数值模拟分析[J]. 四川大学学报：工程科学版，2010，42(增1)：70–75.(LI Xinpo，HE Siming. Numerical analysis of the failure of heavily jointed rock slopes using PFC2D[J]. Journal of Sichuan University：Engineering Science，2010，42(Supp.1)：70–75.(in Chinese))
[17] 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]. 湘潭：湘潭大学，2010.(HE Xuwen. Numerical analysis of the stability of jointed rock slope based on DEM[M. S. Thesis][D]. Xiangtan：Xiangtan university，2010.(in Chinese))
[18] ZHANG C H，PEKAU O A，JIN F，et al. Application of distinct element method in dynamic analysis of high rock slopes and blocky structures[J]. Soil Dynamics and Earthquake Engineering，1997，16(6)：385–394.
[19] 中华人民共和国行业标准编写组. DL/T5353—2006 水电水利工程边坡设计规范[S]. 北京：中国电力出版社，2007.(The Professional Standards Compilation Group of People?s Republic of China. DL/T5353—2006 Design specification for slope of hydropower and water conservancy project[S]. Beijing：China Electric Power Press，2007.(in Chinese))
[20] Itasca Consulting Group Inc.. PFC2D particle flow code in 2 dimensions，user?s guide[R]. Minneapolis：Itasca Consulting Group Inc.，2002：50–66.
2013, Vol. 32 
