喻家滑坡形成的力学机理与险情分析  

Formation mechanism and risk analysis of Yujiabian landslide

作　　者：王成华[1] 林立相[1] 张晓刚[1] 

机构地区：[1]中国科学院水利部成都山地灾害与环境研究所,四川成都610041

出　　处：《自然灾害学报》2000年第2期100-104,共5页Journal of Natural Disasters

基　　金：中国科学院泥石流滑坡研究特别支持基金

摘　　要：喻家滑坡发现于去年5月，体积近17×104m3，呈长条纺棰状，分成上、下滑块。本文从斜坡的变形历史、特征调查入手，较深入地研究了该滑坡滑移-拉裂-推动-牵引的耦合力学机理。该滑坡正处在蠕滑阶段，近期存在整体滑移和出现较大危害的险情，已引起有关部门的重视，并采取了有力的减灾防灾措施。Yujiabian landslide is located at Rongshan Town, Guangyuan City, SichuanProvince. It takes a spind1e shape with a volulne of 17 ×104m3. The slope where the landslidedeveloped averages a gfadient of 16°and is paralelled to the river bank. The slip sul-face is de-veloped along the interface of the strongly eroded masses and the carboniferous rock layers,and its slip body consists of gravelled clay. Fil-st symptom of the slope's deformation came inseptember, 1998 when the rearward buildings No.46 & No.47 were distorted into fissures onthe walls and the ground. ln the mid-March of 1999, after days of rainfall, both thedisplacement was worsened in the rear and the crack formation extended to the middle and thefornt of slope. According to insitu surveys, the occurrence of the landslide must be mechanicalinteraction of tension, pushing, and drawing. Its development could be divided into threephases of tehsion movement, stress transmission, and integrated failure, and the second phase isit in. The tendency from current mechanical analysis would be the deformation by kineticpushing from the upper slip block or that by drawing from the lower one. The result morelikely to occur would be the first situation.

关 键 词：滑坡 蠕滑阶段 相互作用机理 力学机理 险性 

分 类 号：P642.22[天文地球—工程地质学]