基于差异渗透的花岗岩残坡积土滑坡群发规律研究

doi:10.3799/dqkx.2026.100

基于差异渗透的花岗岩残坡积土滑坡群发规律研究

doi: 10.3799/dqkx.2026.100

1. 广东省地质局韶关地质调查中心, 广东韶关 512026;
2. 中南大学土木工程学院, 湖南长沙 410075;
3. 湖南省交通运输厅规划与项目办公室, 湖南长沙 410000;
4. 香港科技大学土木与环境工程系, 香港九龙 999077

基金项目:

湖南省自然科学基金部门联合基金项目（2026JJ30045），国家自然科学基金资助项目（51579137）

详细信息

作者简介:
龚锦钊（1988-），男，高级工程师，硕士.研究方向:地质灾害风险预警及防治.E-mail:286674302@qq.com

通讯作者:
谢济仁,男，副教授，博士，从事滑坡机理研究工作，Email:jirenxie198911@csu.edu.cn

中图分类号: P642.22
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出版历程
- 收稿日期: 2025-12-19
- 网络出版日期: 2026-05-13

The Spatiotemporal Mass-Triggering Mechanism of Granite Residual-Colluvial Soil Landslides Induced by Differential Infiltration

1. Shaoguan Geological Survey Center of Guangdong Bureau of Geology, Shaoguan 512026, China;
2. School of Civil Engineering of Central South University, Changsha 410075, China;
3. Planning and Project Office of Department of Transportation of Hunan Province, Changsha 410000, China;
4. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Kowloon, Hong Kong 999077, China

摘要

摘要: 近年来，极端降雨条件下花岗岩残坡积土群发性滑坡灾害频频发生，严重制约区域发展、威胁人民生命财产安全，然而目前对于花岗岩残坡积土滑坡群发规律仍缺乏清晰的认识，因此难以建立可靠性高、针对性强的减灾防治方法。对此本文以"4·20"群发性花岗岩残坡积土滑坡灾害为研究对象，基于不同深度野外双环渗透试验，研究浅层植被覆盖环境下残坡积土边坡土层渗透参数变化特征，结合土柱渗透实验，探究降雨突增条件下渗透差异土层水分迁移特征，分析差异渗透土层分界面汇水现象及孔压演化规律，运用数值模拟方法，进一步研究降雨强度突增条件下差异渗透花岗岩残坡积土边坡土层分界面孔隙水压力变化规律及对坡体稳定性的影响特征。浅层植被覆盖花岗岩残坡积土边坡存在显著的上下岩土层渗透性差异，在极端降雨期间，该渗透性差异会阻碍水分向下伏低渗透性岩土层运移，致使表层土体及土层界面处因水分滞留引发孔隙水压力急剧累积，进而导致坡体有效应力减小，引起坡体稳定系数迅速下降，最终触发群发性浅层滑坡。该成果为极端降雨下浅层植被覆盖花岗岩残坡积土滑坡失稳规律及群发机理认识提供了重要科学依据和试验支撑，也为花岗岩地区降雨型群发性滑坡减灾防治研究提供了重要参考。
- 群发性花岗岩残坡积土滑坡 /
- 降雨激增 /
- 渗透差异 /
- 破坏规律 /
- 数值模拟
Abstract: In recent years, frequent clustered landslides in granite residual-eluvial soils under extreme rainfall have severely constrained regional development and threatened life and property safety, while the mechanisms behind such clustered failures remain insufficiently understood, consequently impeding the development of highly reliable and targeted mitigation measures. This study investigates the "4·20" clustered granite residual soil landslide event through field double-ring infiltration tests at different depths to characterize permeability variations in shallow vegetated zones, combined with soil column infiltration experiments to examine water migration patterns in layers with permeability contrasts during rainfall intensification, analyzing water accumulation and pore pressure evolution at soil interfaces. Numerical simulations were further employed to study pore water pressure dynamics at interfacial zones of permeability contrast and their effects on slope stability under sudden rainfall increase. The results demonstrate that significant permeability differences between upper and lower layers in shallow vegetated granite residual slopes hinder downward water movement during extreme rainfall, causing rapid moisture retention and sharp pore pressure buildup at soil interfaces, which reduces effective stress and leads to a rapid decline in the slope safety factor, ultimately triggering clustered shallow landslides. These findings provide important scientific evidence and experimental support for understanding the failure mechanisms of vegetated granite residual slopes under extreme rainfall, and offer valuable references for the study of mitigation strategies for rainfall-induced clustered landslides in granite regions.
- group-occurrence granite residual and colluvial soil landslides /
- rainfall surge /
- permeability contrast /
- failure mechanism /
- numerical simulation

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