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以陈家坝场镇滑坡为例,通过对都坝河阶地的调查,概化出了都坝河阶地模型;根据对陈家坝滑坡的地貌学分析,结合水文地质调查和剖面对比,发现陈家坝滑坡位于都坝河的二级阶地上,是大型阶地型地震滑坡;通过陈家坝阶地地震滑坡的地形地貌、物质组成和岩土体力学性质室内试验分析,对其成因机制进行深入研究,发现陡倾的地形条件、松散的物质条件以及滑坡区前后缘高差大构成了滑坡的基本条件,而地震波反复剪切作用下饱和滑带土的残余剪切强度低和距离断裂带较近的强地震动是滑坡形成的主要原因;在对滑坡阶地模型概化的基础上,考虑滑坡的三维空间效应,采用有限差分强度折减法对其在自然状态、暴雨、地震等工况下进行了三维稳定性分析评价,并得到了不同工况下滑坡潜在三维不稳定的区域。这些分析对阶地型地震滑坡失稳机制的研究及稳定性评价具有一定的意义。
Taking the landslide in Chenjiabachang Town as an example, through the investigation of the terraces of Duba River, the model of the terraces of the Duba River has been generalized. According to the geomorphological analysis of the Chenjiaba landslide and the comparison of the hydrogeological survey with the profile, Jiaba landslide is located on the second terrace of Duba River and is a large terraced earthquake landslide. Through the laboratory test and analysis of topography, composition of matter, and mechanical properties of rock and soil in Chenjiaba landslide, the genetic mechanism of Jiaba landslide is studied in depth It is found that the steep terrain conditions, loose material conditions and large elevation difference between the front and back landslide landslide constitute the basic conditions of landslide, while the residual shear strength of saturated landslide soil under the repeated shearing of seismic waves is low and closer to the fault zone The strong ground motion is the main reason for the landslide formation. Based on the generalization of landslide model, considering the three-dimensional space effect of the landslide, the finite-difference strength reduction method is used to study the landslide conditions under natural conditions, rainstorms and earthquakes Three-dimensional stability analysis and evaluation, and obtained under different conditions landslide potentially three-dimensional instability region. These analyzes are of great significance to the research and stability evaluation of the instability mechanism of terrace landslide.