澜沧江某水电站右坝肩工程边坡倾倒变形问题的数值模拟研究  

NUMERICAL SIMULATION FOR THE PROBLEM OF PROJECT SLOPE TOPPLING DEFORMATION ON THE RIGHT OF A HYDROPOWER STATI ON DAM ABUTMENT IN LAN-CANG RIVER

作　　者：赵小平[1] 李渝生[1] 陈孝兵[1] 林富财[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,成都610059

出　　处：《工程地质学报》2008年第3期298-303,共6页Journal of Engineering Geology

摘　　要：澜沧江某水电站处于青藏高原东部边缘地带,属于高山峡谷地形地貌,高地应力环境,岩体卸荷裂隙很发育,使得倾倒变形和岩体质量、断裂活动及地震构造一样成为影响工程边坡岩体稳定的主要因素。针对工程边坡的大变形问题可采用离散元的数值模拟分析方法。通过建立理论开挖和工程边坡开挖离散元模型,可分别得出倾倒变形破坏机理发展过程为初期弱倾倒变形岩体的层内剪切错动、强倾倒变形岩体的层内拉张变形、强倾倒变形岩体的切层张-剪破裂及极强倾倒破裂岩体的折断张裂(坠覆)破裂和工程边坡的变形范围、确定开挖面及加固方式等。通过工程边坡模型的计算结果和现场地质调查成果的比较表明,计算结果和实际情况基本吻合。A hydroelectric power station at Lan - Cang river locates the east brim zone of Qing - Zhang tableland. This site is at alpine canyon, has high tectonic stress circumstance and rock mass unload cranny development, and toppling deformation. They become the most important facts which effect the stability of project slope as rock mass quality, rupture action and seismicty. Deformation discrete element method can be used. This paper develops two discrete element models. One model is a theoretical excavation model and the other is a actual slope excavation model. The results of the theoretical model show that the destroying mechanism is the cutting deformation in ebb toppling deformation, fracturing deformation, strain -shear rupture in the lay of strong toppling rock mass and break rupture in strong rupture rock mass and the deformation range, excavation face, reinforce method and so on. Comparing the results of the project slope excavation model with the results of the site geological investigation show that calculated results and field data are basically similar.

关 键 词：工程边坡 倾倒变形 数值模拟 离散单元法 

分 类 号：TD824.7[矿业工程—煤矿开采]