土质滑坡坡表倾斜变形的室内外试验研究

Surface tilt deformation of soil landslides based on laboratory and field tests

近年来,滑坡倾斜变形已成为滑坡监测预警的重要指标,但是目前关于坡表倾斜变形与滑坡发育特征的研究尚处于探索阶段。通过开展系列降雨模型试验,并结合现场试验,探究滑坡灾害演进过程中坡表位移与倾斜变形的关系,建立基于坡表倾斜-时程曲线的滑坡预警方法。试验结果表明:滑坡在破坏阶段坡表倾斜变形加速,倾角速率倒数与滑坡残留时间呈线性关系,利用该线性关系可预测滑坡最终破坏时间;滑坡滑动过程中坡表倾斜变形与位移呈线性关系,其斜率与滑动半径一致。根据试验结果首次揭示了坡表变形与滑带几何特征的关系,并为基于坡表变形的滑坡滑带预测方法提供了试验依据。

In recent years,surface tilt deformation of soil landslides has become an important indicator of landslide monitoring and early warning,but few studies have been done on the relationship between the slope surface tilt deformation and development characteristics of landslides.In this paper,a series of rainfall model tests combined with field tests was carried out to explore the relationship between the displacement and tilt deformation of slope surface in the process of landslide disaster evolution.A landslide warning method based on the curve of slope surface tilt deformation with time was established.The test results showed that the surface tilt deformation of soil landslides accelerates in the failure stage.There is a linear relationship between the reciprocal of tilt rate and the residual time of landslide before the failure,which can be used to predict the final failure time of landslides.In addition,in the process of landslide sliding,the surface tilt deformation and displacement of the landslide also show a linear correlation,and the corresponding slope is consistent with the sliding radius.The findings reveal,for the first time,the relationship between the slope surface tilt deformation and the geometric characteristics of the sliding zone,also provide the experimental basis for the prediction method of landslide sliding zone based on slope tilt surface deformation.