金安桥水电站崩塌堆积体稳定性分析  

Stability analysis of collapsed accumulation body in Jin’anqiao hydropower station

作　　者：蔡浩然 闵望[2] Cai Haoran;Min Wang(School of Earth Scientces and Engineering,Hohai University,Nanjing 211100,China;Jiangsu Province Geological Survey Institute,Nanjing 210000,China)

机构地区：[1]河海大学地球科学与工程学院,江苏南京211100 [2]江苏省地质调查研究院,江苏南京210000

出　　处：《山西建筑》2022年第16期74-77,共4页Shanxi Architecture

基　　金：国家自然科学基金(41672258);江苏省国土厅科技计划项目(2018045);河海大学大学生创新训练项目(202110294168Y)。

摘　　要：结合金安桥水电站崩塌堆积体现场调查的工程地质资料,分析崩塌堆积体的破坏机制及破坏形式,利用极限平衡理论进行了稳定性评价。极限平衡理论中采用了简化Bishop法、Janbu修正法、Spencer法和M-P法四种分析方法。利用SLIDE软件进行分析计算,考虑了确定滑移面模式和随机面模式分别在天然状态、地震、强降雨、强降雨+地震四种工况下崩塌堆积体的稳定情况。计算时将崩塌堆积体分为5层,由地表向下分别为崩坡积层、堆积体接触带、卸荷松动岩体、弱风化岩体和微风化岩体。由计算结果可知:沿崩塌堆积体底面和凝灰岩夹层组合的整体性平面滑动以及下部松动岩体接触面和凝灰岩夹层组合的滑动破坏可能性较大。地震及强降雨工况对于崩塌堆积体的稳定性影响非常明显,边坡可能出现整体性的破坏。总体来说,崩塌堆积体稳定性较差,出现破坏的概率较大,必须对其采取合理的支护加固措施并进行相应的监控,以保证工程建设能够顺利进行。In this paper,based on the engineering geological data from field investigation of collapsed accumulation body of Jin’anqiao Hydropower station,the failure mechanism and failure form of collapsed accumulation body are analyzed,and the stability of collapsed accumulation body is evaluated by using limit equilibrium theory.In limit equilibrium theory,simplified Bishop method,Janbu correction method,Spencer method and M-P method are adopted.SLIDE software is used for analysis and calculation,and the stability of collapsed accumulation body under natural state,earthquake,heavy rainfall and heavy rainfall+earthquake conditions is considered to determine the sliding surface model and random surface model.In the calculation,the collapsed deposits are divided into 5 layers,which are landslide deposits,accumulation contact zone,unloading loose rock mass,weakly weathered rock mass and breezy rock mass.The results show that the possibility of sliding failure along the bottom surface of collapsed accumulation body and tuff interlayer combination is greater than that on the contact surface of lower loose rock body and tuff interlayer combination.Earthquake and heavy rainfall conditions have obvious influence on the stability of collapsed accumulation body,and the slope may be damaged as a whole.Generally speaking,the stability of collapsed accumulation body is poor and the probability of failure is large.Therefore,reasonable support and reinforcement measures and corresponding monitoring measures must be taken to ensure the smooth construction of the project.

关 键 词：崩塌堆积体 极限平衡分析 稳定性 滑移面模式 随机面模式 

分 类 号：TV742[水利工程—水利水电工程]