拉哇水电站泄水建筑物进水口边坡地震动力响应及稳定性分析  

Analysis of dynamic response and stability of the drainage building intake slope at Lawa Hydropower Station under seismic action

作　　者：邓旭 刘东 王庆祥 位伟[1] 姜清辉[1] DENG Xu;LIU Dong;WANG Qingxiang;WEI Wei;JIANG Qinghui(School of Civil Engineering and Architecture,Wuhan University,Wuhan 430072,China;Zhongnan Engineering Corporation Limited,Power China,Changsha 410014,China)

机构地区：[1]武汉大学土木建筑工程学院,湖北武汉430072 [2]中国电建集团中南勘测设计研究院有限公司,湖南长沙410014

出　　处：《地震工程与工程振动》2025年第1期132-142,共11页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(42077253);湖北省自然科学基金项目(2023AFB887)。

摘　　要：我国西南地区水电工程边坡高陡且位于高地震烈度区域,存在地震诱发边坡失稳风险。以金沙江拉哇水电站泄水建筑物进水口边坡工程为依托,基于动力有限元方法对边坡罕遇强度地震工况进行模拟,在此基础上分析了边坡动力响应规律,研究了震后边坡变形、应力及塑性区分布情况,最后采用动力强度折减法评价了泄水建筑物以下边坡的动力稳定性,并揭示了其潜在失稳机制。结果表明:地震作用下边坡加速度响应呈现出高程放大效应、坡表放大效应和结构面放大效应等规律,边坡震后产生最大10.2 mm的永久变形,并新增局部拉应力区及塑性区,罕遇地震工况下边坡潜在滑体的安全系数为1.80,其潜在失稳机制是以断层JF1为后缘面剪切坡脚岩体发生变形破坏。研究可为含顺倾断层的复杂高陡岩质边坡在地震作用下的动力响应及稳定性分析提供参考。The slopes of hydropower projects in southwest China are high and steep and located in high seismic intensity regions.Consequently,there is a risk of earthquake-induced slope instability.Taking the drainage building intake slope of Lawa Hydropower Station at Jinsha River as an example,the dynamic finite element method is used to simulate the slope under rare strong seismic conditions.Based on this,an analysis of the slope dynamic response is conducted.Then,the post-earthquake slope deformation,stress and plastic zone distribution are studied.Finally,the dynamic stability of the slope below the spillway structure is evaluated using the dynamic strength reduction method,which reveals its potential instability mechanism.The results indicate that the acceleration response of the slope shows an elevation amplification effect,a surface amplification effect and a structural surface amplification effect.The slope undergoes the maximum permanent deformation of 10.2 mm after the earthquake,creating new local tensile stress zones and plastic zones.In rare seismic conditions,the safety factor of the potential sliding mass on the slope is 1.80,and its potential failure mechanism is deformation failure with fault JF1 as the rear boundary surface and rock mass at the slope toe shear damaged.This study can provide reference for the dynamic response and stability analysis of complex high and steep rock slopes with favorable-dipping faults under seismic action.

关 键 词：高陡岩质边坡 地震作用 动力响应 震后应力变形 动力稳定性 

分 类 号：U213.13[交通运输工程—道路与铁道工程] P315.9[天文地球—地震学]