危险滑带转移模式下的岩质边坡稳定性评价  

Evaluation on rock-slope stability under dangerous sliding zones transformation pattern

作　　者：赵宗勇[1] 李建林[1] 宛良朋[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《人民长江》2011年第17期28-31,共4页Yangtze River

基　　金：国家自然科学基金资助项目(51009083);湖北省教育厅自然科学研究项目(Q20101201);三峡大学科学基金资助项目(KJ2009B061)

摘　　要：在以往的岩质边坡稳定分析中,均是对单一的危险滑带进行研究,而忽略了其他次危险滑带在某一状态下变为主要危险滑带的可能。鉴于此,以牙根水电站坝址岩质边坡为例,结合该岩质边坡地质情况,建立了带有可能的滑带群边坡模型,采用大型有限元分析软件,对不同蓄水位和不同工况下每条可能滑带进行边坡稳定性计算,研究其内部滑带转移模式。结果表明:边坡的稳定性并不是只受单一的滑带控制,当外界条件发生变化时,边坡最危险滑带发生了转移。如按单一的危险滑带对边坡稳定性进行评价,往往会失真,进而导致边坡加固措施的盲目性。The previous analysis on rock-slope stability was mainly concentrated on single dangerous sliding belt,while the other secondary dangerous sliding belt which may change into main dangerous sliding belt was neglected.Therefore,taking the rock-slope at the dam site of Yagen Hydropower Station as an example and in the combination of geological condition of the rock-slope,the model for potential belt group was established.Through large scaled finite element analysis software,the model was used to analyze the stability of every potential sliding belt under different water levels and operation conditions of the project.The transfer mode of internal sliding belt was studied as well.The analysis results showed that the stability of slope was not only controlled by single sliding belt;the most dangerous sliding belt would change when outside condition changes;if the slope stability was evaluated by single dangerous sliding belt,the result may be distorted,which caused blindness in slope reinforcement.

关 键 词：滑带群 危险滑带转移 边坡稳定性 应力应变 塑性区 

分 类 号：P642.22[天文地球—工程地质学]