彭州市灯杆坡大型滑坡的变形特征及稳定性分析
中冶建工有限公司 黄天均1 吕道义 2 田美霞3
(1 中冶建工有限公司勘察设计院,重庆,400051;2中冶建工有限公司勘察设计院,重庆,400051;3中煤国际工程集团重庆设计研究院,重庆,400016;)
摘要: 受“5.12”汶川地震影响,彭州成为地震次生灾害较重的灾区之一。彭州市灯杆坡滑坡在地震发生前已经有较长时间的蠕变迹象,地震过程中滑坡体后缘出现明显的深拉裂缝,对滑坡中前部形成了明显的挤胀,严重威胁附近村民的生命和财产安全。通过现场调查、工程地质测绘和勘探,分析了滑坡体的变形破坏特征和稳定状态。滑坡变形可分为三个区,Ⅰ区为主形区,Ⅱ和Ⅲ区为Ⅰ区后缘开裂诱发的向两侧的塌陷;滑坡为沿基覆界面的推移式堆积体滑坡,后缘开裂下错,中前部挤胀开裂;降雨和地震因素对滑坡稳定性影响较大,暴雨和地震工况下处于欠稳定到不稳定状态。
关键词: 地质灾害,汶川地震,滑坡,变形,稳定性
中图分类号: 文献标识码: 文章编号:
Analysis of deformation characteristics and stablity of DengGanPo large landslide in PengZhou county
HUANG Tian-jun1,TIAN Mei-xia2,HUANF Da3
(1 Surveying & Designing Institute of CMC Company Ltd, Chongqing 400051, China;2 Chongqing Design & Research Institute Sina-coal International Engineering Group, Chongqing 400016, China; 3 College of Civil Engineering; Chongqing University; Chongqing 400045; China;)
Abstract:By “5.12” WenChuan earthquake influence, PengZhou county becme one of the areas of earthquake-induced disasters. Long-time’s creep deformation have been found before the earthquake for DengGanPo landslide in PengZhou county, the deep-tensile cracks in the following edge are presented, and extruding the middle and fore part, seriously threating at the safety of lives and belongings to nearby villagers. Base on field investigation, geological mapping and exploration, the deformation failure and stability of the landslide are analysed. The landslide can be divided into three zones: Ⅰ is main deformation zone, Ⅱ and Ⅲ is induced collapse to its two sides because of the following edge cracked. The landslide is pushed to slide along the plane of bed rock and overlying stratum, and its following edge cracked and sinked, the middle and fore part extruded and cracked. The rainfall and earthquake greatly influence on the stability of the landslide, which is in a less steady to unstable at storm railfall and earthquake caxe.
Key words:geohazard; WenChuan earthquake; landslide; deformation; stability