滑坡滑前地质模型重建方法与思路——以鲜水河断裂带老虎嘴滑坡为例

Discussion on the reconstruction method of landslide geological model before failure:a case study of Laohuzui landslide in Xianshuihe Fault Zone

准确认识并确定滑前地质模型,是分析滑坡在外部营力作用下变形机理,讨论滑坡形成机制的基础所在。以鲜水河断裂带老虎嘴滑坡为例,提出了滑坡滑前地质模型重建要素,包括地质要素、形态要素、环境要素三个主要方面。提出了滑前地质模型重建的方法与流程,即现今滑坡特征分析、滑前地形恢复、滑前滑坡边界确定、地质要素重建、环境要素重建、滑前地质模型重建。通过对老虎嘴滑坡滑前地质模型重建,获取了滑前地形地貌、剪出口位置、滑体结构等一系列滑坡分析所需参数。结果验证了本文研究方法的可行性和准确性,为研究强活动断裂带滑坡易发性提供了依据。

Three aspects of landslide geological model reconstruction were introduced in this article: Geological factors,includes physical structure,geological structure,etc,which reflect the Intrinsic Attributes;Appearance factors,includes landforms,spatial morphology,boundary feature,etc,which reflect the external morphological characteristics;Environment factors,includes earthquake,climate and hydraulic,engineering activities,etc,which reflect influential and predisposing factors.To reconstruct the landslide geological model can follow the next process: analysis of the characteristics—reconstruction of landform—find out the boundary—reconstruction of geological factors—reconstruction of environment factors—reconstruction of landslide geological model.Based on the geological model reconstruction of Laohuzui landslide,many important parameters such as landforms,shear outlet and sliding body structure were obtained.Results showed that the method of landslide geological model reconstruction were technically feasible,and the conclusion of Laohuzui landslide induced factors were well consistent with the results of field investigation.The method can provide the idea for the studies of landslide susceptibility in Xianshuihe fault zone.