层状岩坡变形破坏及其治理的离散元分析  

Analysis on Deformation Failure Mechanism and Control Measurement of Layered Dip Rocky Slope Based on Discrete Element Method

作　　者：景锋[1] 冷先伦[2] 朱泽奇[2] 

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]中国科学院武汉岩土力学研究所,岩土力学与工程国家重点实验室,湖北武汉430071

出　　处：《水利与建筑工程学报》2010年第4期61-64,共4页Journal of Water Resources and Architectural Engineering

基　　金：长江科学院2009年中央级公益性科研院所基本科研业务专项资助项目(YWF0910)

摘　　要：某大型水电站为顺倾层状人工高边坡,坡体软弱层面、断层、节理和后缘陡倾卸荷张裂隙对坡体稳定性影响大,在自上而下的挖坡过程中,局部坡体发生了失稳座滑。本文分析了边坡的地质条件和岩体结构特征,采用离散单元法模拟了边坡的变形破坏过程,探讨了坡体的变形破坏机理;研究了在滑坡体上继续挖坡,坡体可能发生的变形破坏形态;另根据坡体变形破坏机理及后续开挖边坡可能发生的变形破坏形态,基于离散元数值模拟优化了边坡预应力锚杆和抗滑桩的工程加固支护措施,确保了边坡稳定,监测表明,后续坡体开挖及开挖完成后未出现明显变形破坏迹象。The stability of the layered dip rock man-made high slope of a large-scale hydropower station is largely influenced by weak bedding surfaces,faults,fissurings and the relieved separation fractures in after-edge of the slope resulted from excavating,as well as the part slope failure casused during excavating from top to down.The geological conditions and rock mass structure characteristic of the slope are analysed here,and the deformation failure mechanism of the slope is studied by numerical simulation of discrete element method.The possible deformation and failure forms of the slope are studied for excavating under the gliding mass of the slope without any engineering reinforcement.Based on the information of the deformation failure mechanism and possible deformation failure forms of the slope studied before,the reinforcement arrangements of prestress bolts and anti-slide piles are optimized by numerical simulation of discrete element method,so as to ensure the stability of the slope.The monitoring data indicate that there is not any deformation and failure phenomenon during or after excavation of the slope.

关 键 词：层状岩质边坡 稳定性分析 离散元 数值模拟 工程加固 

分 类 号：TU457[建筑科学—岩土工程]