蓄水后典型土质岸坡降雨与地震稳定性区域分析  

Regional analysis of rainfall and seismic stability on typical soil bank slope after water storage

作　　者：汪功茂 石安池 陈建平 周燕国[1,2] 汪玉冰 WANG Gong-mao;SHI An-chi;CHEN Jian-ping;ZHOU Yan-guo;WANG Yu-bing(MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou 310058,Zhejiang,China;Center for Hypergravity Experiment and Interdisciplinary Research,Zhejiang University,Hangzhou 310058,Zhejiang,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,Zhejiang,China;Zhejiang Huadong Construction Engineering Corporation Limited,Hangzhou 310014,Zhejiang,China)

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学超重力研究中心,浙江杭州310058 [3]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [4]浙江华东建设工程有限公司,浙江杭州310014

出　　处：《地基处理》2023年第6期468-476,共9页Journal of Ground Improvement

基　　金：国家自然科学基金青年科学基金(51808490)。

摘　　要：强降雨、地震等自然灾害频发地区,边坡稳定性的区域分析通常采用无限边坡模型,然而以往研究所选用的土层深度通常为粗略估计。本研究将钻孔实测的土层深度数据导入ArcGIS地理统计分析模块,通过普通克里金插值方法构建区域边坡地层模型。运用插值所得土层深度数据,通过无限边坡模型计算蓄水前、蓄水后、蓄水后降雨、蓄水后地震等不同工况下的边坡稳定性系数,进一步分析蓄水后各工况下边坡稳定性系数的变化情况,并绘制相应地图用于定位各工况下稳定性相对较低的区域。本文将上述研究方法应用到白鹤滩水电站水库上游区域。区域分析结果表明,蓄水及降雨工况对于岸坡稳定性影响较小而地震工况下岸坡稳定性系数整体下降较大,其中局部区域下降比例达到50%以上。研究结果可为区域边坡工程设计和场地防灾减灾规划提供参考。In areas with frequent natural disasters such as heavy rainfall and earthquakes,the regional analysis of slope stability usually adopts the infinite slope model.However,previous studies have often relied on rough estimates for soil depth selection.To address this limitation,this study imports measured soil depth data from boreholes into the geostatistical analysis module of ArcGIS and constructs a regional slope stratum model using the ordinary Kriging interpolation method.Utilizing the interpolated soil depth data,the slope stability factor is calculated for various working conditions,including pre and post-water storage,post-water storage rainfall,and post-water storage earthquake scenarios,using the infinite slope model.Furthermore,the study analyzes the changes in slope stability factor under different working conditions after water storage and generates corresponding maps to identify areas with relatively low stability under various scenarios.The research methods outlined above are applied to the upstream area of Baihetan Hydropower Station Reservoir.The regional analysis results indicate that water storage and rainfall conditions have a negligible impact on bank slope stability.However,the overall decline in bank slope stability factor under earthquake conditions is substantial,with some local areas experiencing a decline proportion of more than 50%.These findings can serve as valuable references for regional slope engineering design and site disaster prevention and reduction planning.

关 键 词：地理信息系统 边坡稳定性 区域分析 克里金插值 降雨 地震 

分 类 号：TU43[建筑科学—岩土工程]