基于微震的溪洛渡拱坝右岸变形规律探究  

Study on deformation law of right bank of Xiluodu arch dam based on microseismic and numerical simulation

作　　者：黄海龙 张绍成 沙椿 何刚 HUANG Hailong;ZHANG Shaocheng;SHA Chun;HE Gang(China Three Gorges Construction Engineering Corporation,Chengdu 610041,China;Chengdu Engineering Corporation Limited,Chengdu 610072,China;Sichuan Hydropower Engineering Geophysical Exploration CO,LTD,Chengdu 610072,China)

机构地区：[1]中国三峡建工(集团)有限公司,成都610041 [2]中国电建集团成都勘测设计研究院有限公司,成都610072 [3]四川中水成勘院工程物探检测有限公司,成都610072

出　　处：《物探化探计算技术》2024年第6期712-724,共13页Computing Techniques For Geophysical and Geochemical Exploration

基　　金：中国三峡集团公司科研经费的赞助(XLD/2170)

摘　　要：随着我国对水资源的大力开发,大批水电站正在建设,其中一部分已经投入使用,这些水电站都伴随着高陡的岩质边坡,使得边坡的稳定性问题尤为突出,因此对蓄水期岩质高边坡的变形破坏特征以及稳定性问题的分析研究就变得非常重要。笔者通过对溪洛渡水电站蓄水期右岸边坡进行微震监测和数值模拟计算,揭示了右岸边坡深部岩体的微震事件所处岩层,分析研究了右岸边坡应力和位移与蓄水位的关系特征,在蓄水加载过程及泄水卸载过程中,微震事件均主要分布在上游围堰至下游二道坝之间右岸坝基下方深部阳新灰岩层中,玄武岩地层中分布较少,判断溪洛渡水电站大坝坝基在蓄水过程中出现局部岩体应力集中和应力迁移现象。With the vigorous development of water resources in China,a large number of hydropower stations are under construction or have been put into use.These hydropower stations are accompanied by high and steep rock slopes,making slope stability particularly prominent.Therefore,analyzing and studying the deformation and failure characteristics and stability of high rock slopes during impoundment is crucial.In this paper,the microseismic monitoring and numerical simulation of the right bank slope of Xiluodu Hydropower Station during the impoundment period are carried out.The rock strata where the microseismic events of the deep rock mass of the right bank slope are located are revealed.The relationship between the stress and displacement of the right bank slope and the water storage level is analyzed and studied.In water storage loading and discharge unloading,the microseismic events are mainly distributed in the deep Yangxin limestone strata below the right bank dam foundation between the upstream cofferdam and the downstream second dam,and the basalt strata are less distributed.It is judged that local rock mass stress concentration and stress migration occur in the dam foundation of Xiluodu Hydropower Station during impoundment.

关 键 词：岩质高陡边坡 边坡稳定性 微震监测 数值模拟 

分 类 号：TV223.1[水利工程—水工结构工程]