溪洛渡库区河口滑坡变形特征和形成机制  

Deformation Characteristics and Formation Mechanism of Hekou Landslide in Xiluodu Reservoir Area

作　　者：梁宇 严磊 苏培东[2] 邱鹏[2] 龙伟 汪意凌 LIANG Yu;YAN Lei;SU Pei-dong;QIU Peng;LONG Wei;WANG Yi-ling(Chengdu Engineering Corporation Limited, Power China, Chengdu 611130, China;School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China)

机构地区：[1]中国电建集团成都勘测设计研究院有限公司,成都611130 [2]西南石油大学地球科学与技术学院,成都610500

出　　处：《科学技术与工程》2021年第34期14500-14507,共8页Science Technology and Engineering

基　　金：四川省科技厅应用基础研究项目(19YYJC1060);中国电建集团成都勘测设计研究院有限公司科技项目(CD2C20210123)。

摘　　要：溪洛渡库区河口滑坡位于金沙江下游溪洛渡水电站东南岸坡上,永善县城至大兴集镇、莲峰镇公路横穿滑坡。滑坡一旦失稳将切断两个镇的生命线,甚至对库区形成危害。在现场地质测绘、勘察和数值模拟的基础上,对河口滑坡的变形特征和形成机制进行了研究。结果表明:河口滑坡是一个大型深层岩质滑坡;变形特征上可分为强变形区、弱变形区和松弛区;破坏模式上可分为前缘倾倒破坏模式和中后部滑移破坏模式;滑坡整体变形模式为倾倒-滑移-拉裂-剪断模式。滑坡主要影响因素有库水作用、地质构造、卸荷作用;河口滑坡若继续在库水作用和卸荷作用的影响下将继续变形。The Hekou landslide of Xiluodu reservoir area is located on the southeast bank slope of Xiluodu hydropower station in the lower reaches of Jinsha River.The road from Yongshan County to Daxingji Town and Lianfeng Town crosses the landslide.Once the landslide is unstable,it will cut off the lifeline of the two towns,and even endanger the reservoir area.Based on field geological mapping,investigation and numerical simulation,the deformation characteristics and formation mechanism of Hekou landslide were studied.The results show as follows.Hekou landslide is a large deep rock landslide.The deformation characteristics can be divided into strong deformation zone,weak deformation zone and relaxation zone.The failure mode can be divided into the leading edge dumping failure mode and the middle and rear sliding failure mode.The overall deformation mode of the landslide is dumping-sliding-cracking-shearing mode.The main influencing factors of landslide are reservoir water action,geological structure and unloading action.The Hekou landslide will continue to deform under the influence of reservoir water and unloading.

关 键 词：岩质滑坡 变形特征 形成机制 库水作用 莲峰断裂 

分 类 号：P642.22[天文地球—工程地质学]