库水及降雨条件下顺层碎裂岩质滑坡地下水动态迁移规律及变形机理——以三峡库区木鱼包滑坡为例

doi:10.11988/ckyyb.20240195

长江科学院院报

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库水及降雨条件下顺层碎裂岩质滑坡地下水动态迁移规律及变形机理——以三峡库区木鱼包滑坡为例

邓茂林¹^,²(), 梁之康¹^,²(), 王国法³, 汪标², 周露露², 万航², 彭旭², 苏鹏民², 朱晓涵²

1.湖北长江三峡滑坡国家野外科学观测研究站，湖北宜昌 443002
2.三峡大学土木与建筑学院，湖北宜昌 443002
3.重庆市地质矿产勘查开发局208水文地质工程地质队，重庆 400714

收稿日期:2024-03-04 修回日期:2024-05-31 出版日期:2024-06-19
作者简介:邓茂林（1980—），男，四川达州人，副教授，博士，主要从事地质灾害机理研究。E-mail: dmltop@163.com
基金资助:
国家自然科学基金(42172303)

Dynamic migration law of groundwater and deformation mechanism in Cataclastic bedding landslide under Action of reservoir water and rainfall —A Case Study of Muyubao Landslide in the three Gorges Reservoir area

DENG Mao-lin¹^,²(), LIANG Zhi-kang¹^,²(), WANG Guo-fa³, WANG Biao², ZHOU Lu-lu², WAN Hang², PENG Xu², SU Peng-min², ZHU Xiao-han²

1. National Field Observation and Research Station of Landslides in Three Gorges Reservoir Area of Yangtze River, Yichang 44302, China
2. School of Civil Engineering and Architecture, China Three Gorges University, Yichang 44302, China
3. Hydrogeology & Engineering Team 208, Chongqing Bureau of Geological Exploration, Chongqing 400714, China

Received:2024-03-04 Revised:2024-05-31 Published:2024-06-19

摘要/Abstract

摘要：

库水升降及降雨引起库岸地下水动态变化，地下水动态升降是顺层碎裂岩质滑坡变形破坏的直接诱发因素之一。本文通过三峡库区木鱼包滑坡近7年监测数据、勘察资料等，研究了降雨、库水位与地下水位之间的定量关系，以及坡体变形对地下水的响应机制。研究表明：（1）地下水升降明显先于坡体变形，由降雨和库水位来预测地下水位，可进一步判断坡体变形情况，这为滑坡预警预报提供了有力依据。（2）当坡体前部地下水位超过最高库水位(175m)时，坡体变形在浮托减重效应影响下，动水压力作用逐渐增强。（3）获得了降雨抬升地下水位的阈值，持续降雨10d降雨量达150mm，坡体前部地下水位抬升3.22m~6.88m；30d内降雨量300mm，坡体前部地下水位抬升10m左右。（4）2017年10月-12月，前部平台QSK1钻孔地下水位高达184.2m，比库水位(175m)高近10m，72d坡体位移量为88.5mm。该研究成果为库区顺层岩质滑坡监测预警、防灾减灾和库水调度提供理论支撑。

关键词: 地下水位, 降雨, 库水位, 碎裂顺层岩质滑坡, 变形机理

Abstract:

The rise and fall of reservoir water and rainfall cause dynamic changes in groundwater in the Three Gorges Reservoir area. The dynamic rise and fall of groundwater levels is one of the most direct factors inducing the deformation and damage of cataclastic bedding rock landslides. This paper studys the response mechanism of landslide deformation to groundwater and the quantitative relationship among rainfall, reservoir water level, and groundwater level using monitoring data, investigation data from the Muyubao landslide in the Three Gorges Reservoir area over the past 7 years. Research shows that: (1) Groundwater rises and falls significantly earlier than landslide deformation. Predicting groundwater levels from rainfall and reservoir water levels can judgement landslide deformation, which provides a strong basis for landslide warning and forecasting. (2) When the groundwater level in the front of the landslide exceeds the maximum reservoir water level (175m), the deformation of the landslide is affected by the the floating weight-loss effect, and dynamic water pressure gradually increases. (3) The threshold value for rainfall to raise the groundwater level was obtained. Continuous rainfall for 10 days, the rainfall reached 150mm, and the groundwater level in front of the landslide increased by 3.22m-6.88m; when rainfall reached 300mm in 30 days, the groundwater level in the front of the landslide increased by about 10m.(4) From October to December 2017, the groundwater level in the QSK1 borehole on the front platform was as high as 184.2m, nearly 10m higher than the reservoir water level (175m). The landslide displacement in 72 days was 88.5mm. The research results provide theoretical and technical support for monitoring, early warning, disaster prevention and mitigation, reservoir water regulation of bedding rock landslides in the three Gorges Reservoir area.

Key words: groundwater level, rainfall, reservoir water level, cataclastic bedding landslide, deformation mechanism

中图分类号:

P642.22

邓茂林, 梁之康, 王国法, 汪标, 周露露, 万航, 彭旭, 苏鹏民, 朱晓涵. 库水及降雨条件下顺层碎裂岩质滑坡地下水动态迁移规律及变形机理——以三峡库区木鱼包滑坡为例[J]. 长江科学院院报, DOI: 10.11988/ckyyb.20240195.

DENG Mao-lin, LIANG Zhi-kang, WANG Guo-fa, WANG Biao, ZHOU Lu-lu, WAN Hang, PENG Xu, SU Peng-min, ZHU Xiao-han. Dynamic migration law of groundwater and deformation mechanism in Cataclastic bedding landslide under Action of reservoir water and rainfall —A Case Study of Muyubao Landslide in the three Gorges Reservoir area[J]. Journal of Changjiang River Scientific Research Institute, DOI: 10.11988/ckyyb.20240195.

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库水及降雨条件下顺层碎裂岩质滑坡地下水动态迁移规律及变形机理——以三峡库区木鱼包滑坡为例

Dynamic migration law of groundwater and deformation mechanism in Cataclastic bedding landslide under Action of reservoir water and rainfall —A Case Study of Muyubao Landslide in the three Gorges Reservoir area

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