降雨和地震条件下浅层黄土滑坡三维稳定性评价  

Three-dimensional stability evaluation of shallow loess landslides under rainfall and earthquake conditions

作　　者：李泊良 张帆宇[1] LI Bo-liang;ZHANG Fan-yu(College of Civil Engineering and Mechanics,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学土木工程与力学学院,兰州730000

出　　处：《工程科学学报》2022年第3期440-450,共11页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(42090053,41977212);兰州大学中央高校基本科研业务费专项资金资助项目(lzujbky-2021-ct04)。

摘　　要：以兰州市大沙沟流域浅层黄土滑坡为研究对象,整合降雨渗透模型到黄土斜坡三维确定性模型,评价不同降雨和地震耦合效应下浅层黄土滑坡稳定性,并用混淆矩阵法和受试者工作特征曲线法(ROC)评价稳定性评价预测的结果.研究结果发现,耦合降雨入渗和地震的三维确定性模型,对流域尺度浅层黄土滑坡稳定性评价具有较好效果,能作为降雨和地震诱发黄土滑坡灾害评价和早期预警的工具,对加强不同尺度极端事件下黄土滑坡灾害时空灾害评价和预测具有重要参考价值.Loess is widely distributed in the Northwest Plateau of China.One-third of the landslides in China occur in the loess area.Shallow loess landslides are especially widespread and frequent geological disasters,causing serious casualties and huge property damage.Under rainfall and loading,loess is prone to structural collapse and strength reduction.Therefore,shallow loess landslides distribute widely and occur frequently.Usually,rainfall and earthquakes are the frequent and active triggers for loess landslides.In recent years,a large number of loess landslides have been induced by the coupling of rainfall and earthquakes on the Loess Plateau.Although the coupling effect of earthquake and rainfall will seriously aggravate the instability probability and disaster risk of shallow loess landslides,there is still a lack of quantitative disaster evaluation research on such landslide events.This study chose the shallow loess landslide as the research object in the Dashagou catchment of Lanzhou city.The rainfall penetration model was integrated into a three-dimensional deterministic model of the loess slope,and the stability of the shallow loess landslide was evaluated in the study area with different rainfall and seismic coupling effects.The confusion matrix and the receiver operating characteristic(ROC)curve were used to evaluate the results of the stability evaluation prediction.Results of this study reveal that the integration of a three-dimensional deterministic model of rainfall infiltration and earthquake effects has a good impact on the stability evaluation of shallow loess landslides at the watershed scale.Moreover,this model can be used as a tool for the assessment and early warning of rainfall and earthquake-induced loess landslides.The employment of the three-dimensional deterministic model considering a complicated slope and rainfall situation has great significance in the acquisition of results that are more accordant with the actual situation.It is of great reference value to strengthen the spatiotemporal dis

关 键 词：浅层黄土滑坡 地震 降雨 渗透模拟 稳定性评价 

分 类 号：P642.22[天文地球—工程地质学]