川北某顺层岩质滑坡稳定性评价  

Stability Evaluation of a Bedded Rock Landslide in Northern Sichuan

作　　者：卢洪沛 胡正涛[2,3] 唐利平[3] 

机构地区：[1]甘孜州地质环境监测站,四川康定626000 [2]甘孜州国土资源局,四川康定626000 [3]四川省冶金地质勘查局水文队,四川成都611730

出　　处：《资源环境与工程》2016年第2期194-197,共4页Resources Environment & Engineering

基　　金：四川省地震灾区第五批重大地质灾害应急勘查项目(川国土资函[2010]76号)

摘　　要：受"5·12"地震影响,加之坡脚安置区建设切坡活动,川北某顺层岩质滑坡滑移—拉裂变形加剧。2009年暴雨诱发该滑坡较大规模滑动,中部见拉陷槽,后缘拉裂缝、左侧剪切裂缝加大、贯通。滑坡的变形破坏模式属滑移—拉裂;起动机制为暴雨条件下在拉裂带内静水压力和沿滑移面空隙水扬压力的联合作用下平推式滑动。滑坡天然工况下处于稳定状态,暴雨工况下为不稳定状态,地震工况下为基本稳定状态。提出"裂缝充填+挡土墙+截排水"、"切方"两个比选治理方案,从技术、经济角度综合对比后推荐采用沿顺层的平面切方应急排危方案处置滑坡。Affected by the ＂5·12＂ Wenchuan earthquake,coupled with the slope cutting at the toe for the construction of resettlement areas,sliding and fracturing deformation of a bedded rock landslide in northern Sichuan Province intensifies. Large scale sliding is induced by heavy rainfall in 2009. Pull trough appear in the middle of the landslide,the cracks of the trailing edge and the left side increased and linked up. The deformation and failure mode of the landslide is sliding and fracturing. Starting mechanism is translational slide combined hydrostatic pressure at cracking zone with pore water uplift pressure along the slip surface in heavy rain. The stability of landslide is stable in natural conditions. Finally,the treatment schemes for the landslide are put forward： one is crack filling and retaining wall and drainage,the other is slope cutting. Cutting slope along the bedding plane for emergency disposal of landslide is recommended after the technical and economic comparison.

关 键 词：顺层岩质滑坡 平推式滑动 成因机制 稳定性评价 防治对策 

分 类 号：P642.22[天文地球—工程地质学] P694[天文地球—地质矿产勘探]