摘要
岩质边坡内部常存在许多节理裂隙,使得岩质边坡成为不连续介质体,导致其稳定性分析比较困难。现有的离散元程序可以计算由封闭曲面或曲线构成的块体系统的稳定性,但是难以模拟在地震等荷载作用下的裂隙扩展、块体重构和多块体组合破坏等现象。针对这一问题,根据格里菲斯断裂理论,在裂隙尖端岩桥位置沿可能的开裂方向设置虚拟节理裂隙,生成多个潜在关键滑移块体,利用离散元软件UDEC计算岩质边坡的应力场并结合刚体极限平衡法评价滑移块体的稳定性,进而判断最可能滑移块体和滑移路径。基于上述思想,开发了相应滑移块体搜索算法和评价机制,研制了考虑扩展裂隙的适用于静力和动力分析的二维岩质边坡稳定性分析软件SAFESLOPE,对多种节理组合块体开展了静动力算例验证工作。
The stability analysis of rock slope has always been a hot and difficult problem in geotechnical engineering. Many cracks in rock slope make it to be a discontinuous medium,making the stability analysis of rock slope difficult. Existing discrete element program can calculate the stability of blocks consist of closed surface or curves,but it is difficult to simulate the phenomena of crack propagation,new block generation and multi blocks destruction under the action of earthquake. To solve these problems,the method of adding virtual joints and cracks at the position of crack tip＇s rock bridge along the potential failure direction based on the Griffith fracture theory is proposed,which will result in multiple potential critical slip block being generated. At the same time,the discrete element software UDEC is used to calculate the stress field of rock slope and the rigid body limit equilibrium method is used to evaluate its stability. Finally the most likely sliding block and sliding path was determined. Based on the above ideas,the two-dimensional rock slope stability analysis software SAFESLOPE considering crack propagation is developed. The software is suitable for static and dynamic stability analysis of two-dimensional rock slope. The static anddynamic calculation verification of a variety combined block examples are carried out.
作者
曾海艳
吴玉龙
张建海
ZENG Haiyan1,3, WU Yulong2, ZHANG Jianhai3(1. Sichuan Water Resources and Hydroelectric Investigation ＆ Design Institute, Chengdu, Sichuan 610072, China; 2. Chengdu Municipal Engineering Design and Research Institute, Chengdu, Siehuan 610023, China; 3. State Key Laboratory of Hydraulics and Mountain River Development and Proteetion, College of Water Resource ＆ Hydropower, Siehuan University, Chengdu, Sichuan 610065, Chin)
出处
《水利与建筑工程学报》
2018年第3期170-174,共5页
Journal of Water Resources and Architectural Engineering
关键词
岩质边坡
裂隙扩展
扩展判据
离散元
刚体极限平衡法
rock slope
crack propagation
crack extension criteria
discrete element
limit equilibrium method structure
