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工程地质学报  2017, Vol. 25 Issue (6): 1547-1556    DOI: 10.13544/j.cnki.jeg.2017.06.018
地质灾害与斜坡稳定性 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
蒋树1, 王义锋2, 唐川3, 潘洪月2, 王坤2
1. 中国长江三峡集团公司, 博士后工作站 北京 100038;
2. 中国三峡建设管理有限公司, 乌东德工程建设部 成都 610041;
3. 地质灾害防治与地质环境保护国家重点实验室(成都理工大学) 成都 610059
JIANG Shu1, WANG Yifeng2, TANG Chuan3, PAN Hongyue2, WANG Kun2
1. Postdoctoral Research Station, China Three Gorges Corporation, Beijing 100038;
2. Wudongde Project Construction Department, China Three Gorges Projects Development Co., Ltd., Chengdu 610041;
3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059
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摘要 金坪子滑坡是金沙江下游乌东德水电站下游方向距离大坝最近的一处巨型深厚崩坡积碎屑土古滑坡,以Ⅱ区活动部分为研究对象,在大量勘察试验成果以及长达11a的精确监测基础上,分析滑坡岩土体的物理力学性质以及滑坡的长期动态特征,特别是滑坡与降雨和地下水的动态响应关系,并基于Green-Ampt降雨入渗模型研究了降雨直接入渗补给地下水的可能性,利用极限平衡法探讨了理想刚塑性条件下该滑坡所受力的平衡关系,进而分析滑坡的活动机理。研究结果表明,滑坡的长期持续活动是滑带土黏性流变特征的表现,地表和深部位移均表现为牵引活动模式,地表自2005~2016年的平均位移速率为0.19~0.87mm ·d-1,深部以基底滑动为主,不同部位具有不同程度的内部变形。降雨是影响滑坡动态的最主要因素,在理想情况下,降雨很难直接入渗补给滑区地下水,地下水动态变化缓慢,与滑坡活动有一定正相关关系,但作用并不显著。与一些动态特征直接受地下水位影响的浅层低速滑坡不同,金坪子Ⅱ区的活动机理更可能是降雨在滑坡上部一定深度范围内形成暂态饱和区,滑体容重和渗透作用的变化影响了滑坡的动态。
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关键词低速滑坡   滑坡动态   抗剪强度   降雨入渗   黏性流变     
Abstract: Jinpingzi landslide is the nearest deep-seated colluvial debris landslide to the arch dam of Wudongde hydropower station in the downstream direction in lower reaches of Jinsha River. Its active zone Ⅱ was studied. Based on geotechnical investigation and long-term monitoring, the physical and mechanical property of the landslide materials and the long-term kinematics, especially the relationships among the landslide movement, rainfall and the groundwater were analysed. The response of the groundwater regime to the precipitation was further analyzed under different initial water content conditions based on the Green-Ampt infiltration model. Relationships between resisting forces and driving forces were discussed by limit equilibrium method assuming rigid-plastic frictional slip. Results showed that the long-term continuous movement was mostly due to the viscous component of the slip zone. Surface and subsurface displacement both showed a retrogressive type with average surface displacement rate 0.19~0.87mm·d-1 from 2005 to 2016. Basal sliding accounted for most of the deformation with different degrees of internal deformation in different parts. Rainfall was the predominant factor affecting the landslide activity but it is hard for rainfall water infiltrating to the deeply buried groundwater regime. Unlike some shallow landslides, the mechanism of Jinpingzi zone Ⅱ slow moving landslide was more likely to be the formation of transient saturated zone in shallow depth. The change of unit weight of the sliding mass and the effect of seepage affected the kinematics of the landslide.
Key wordsSlow moving landslide   Kinematics   Shear strength   Rainfall infiltration   Viscous rheology   
收稿日期: 2017-02-13;
作者简介: 蒋树(1987-),男,博士后,主要从事地质灾害分析评价与防治方面的研究工作.Email:jiangshu_1987@qq.com
. 金沙江下游金坪子Ⅱ区低速滑坡活动机理初探[J]. 工程地质学报, 2017, 25(6): 1547-1556.
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