地震地质 ›› 2002, Vol. 24 ›› Issue (3): 461-468.

• 科研简讯 • 上一篇    

Sarma法在四川云阳鸡扒子滑坡稳定性评价中的应用

马照亭, 梁海华   

  1. 北京大学地质学系, 北京, 100871
  • 收稿日期:2001-08-17 修回日期:2001-12-07 出版日期:2002-09-04 发布日期:2009-10-26
  • 作者简介:马照亭,男,1976年出生,1999年河北地质学院水文地质与工程地质专业毕业,现于北京大学地质学系地震地质专业攻读硕士;主要从事工程地震、信息工程地质方面的研究,电话:010-62751156,E-mail:zhaotingma@sohu.com.

APPLICATION OF SARMA METHOD TO STABILITY EVALUATION OF JIPAZI SLOPE, YUNYANG COUNTY, SICHUAN PROVINCE

MA Zhao-ting, LIANG Hai-hua   

  1. Department of Geology, Peking University, Beijing 100871, China
  • Received:2001-08-17 Revised:2001-12-07 Online:2002-09-04 Published:2009-10-26

摘要: 云阳宝塔滑坡区先后发生了多次滑坡,其中鸡扒子滑坡是最近的1次,新滑坡是在旧滑坡的基础上沿旧滑坡面的部分复活.根据对该滑坡体几何形态、物质成分与结构特征及水文地质特征的考察,初步认为,降水入渗与排水不畅引起的滑坡体内孔隙水压力上升是导致鸡扒子滑坡破坏的主导因素.文中根据极限平衡理论,运用VC++语言编制了Sarma法的计算程序,对三峡水库蓄水后鸡扒子滑坡是否可能再次发生`滑坡进行了评价,指出在滑坡体排水率为50%与三峡水库水位达145m时为滑坡稳定与否的临界值.通过调整影响滑坡稳定性的主要参数的取值,对影响滑坡稳定性的因素进行了动态敏感性分析,指出降水入渗、长江水位、滑坡体的排水状况是影响滑坡稳定性的决定因素,三峡水库蓄水前应针对此采取相应的工程防治措施,才能保证水库蓄水后鸡扒子滑坡不再发生滑动.

关键词: 鸡扒子滑坡, 稳定性评价, Sarma法, 敏感性分析

Abstract: Several landslide events have successively occurred at Baota slope area of Yunyang County, Sichuan Province, among which the Jipazi landslide is the latest one. The Jipazi landslide represents partial revival of an old landslide. The total volume of the sliding mass is up to 1.5?107m3 or more, of which about 2.3?105m3 were detached from the slide channel and slided down below the flood level of the Yangtze River, causing a serious danger to the navigation on this river segment and enormous economic losses. Once the Three-Gorges Reservoir stores water, the water level of the Yangtze River will be much higher than the current level. As a result, new landslide may revive on the old one. Based on the research on the geometry, material component, structural and hydrogeologic features of the sliding mass, it is preliminarily concluded that the Jipazi landslide was caused by the increasing of pore pressure in the sliding mass due to excessive rainfall infiltration and impeded drainage during the storm. In the light of the limit equilibrium theory, a program of Sarma method is designed to evaluate the stability of the Jipazi sliding mass after the Three-Gorges reservoir storing water. The result shows that the critical value of the slope stability is that the water level of the Yangtze River reaches 145m high and the drainage rate of the slope is 50%. The dynamic sensitivity analyses of the factors affecting slope stability are carried out through adjusting the values of some affecting parameters of slope stability. The results show that the rainfall infiltration, the water level of the Yangtze River after the Three-Gorges reservoir storing water and the drainage rate of sliding mass are the crucial causes affecting stability of the Jipazi landslide. Little rainfall infiltration, low water level of the Yangtze River and unimpeded drainage in the sliding mass will enhance the stability of the slope. Therefore, corresponding prevention and control measures must be taken before the Three-Gorges reservoir stores water.

Key words: Jipazi Landslide, stability evaluation, Sarma method, sensitivity analysis

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