胡开颜^1,2,,
莫淳淯²,
张益华²,
李双双²,
孙健维²,
韩鹏^2,,,
黄清华¹
1. 北京大学地球与空间科学学院地球物理系, 北京 100871
2. 南方科技大学地球与空间科学系, 深圳 518055

基金项目: 广东省自然科学基金项目（2018A0303130010）和国家自然科学基金（41874082，41974083）联合资助


详细信息

作者简介: 胡开颜, 女, 1992年生, 北京大学博士后.E-mail: huk@pku.edu.cn

通讯作者: 韩鹏, 男, 1985年生, 南方科技大学助理教授, 主要从事地球电磁学与统计地震学研究.E-mail: hanp@sustech.edu.cn

中图分类号: P319;P631

收稿日期:2021-03-10
修回日期:2021-05-14
上线日期:2021-12-10

An experimental study on monitoring an indoor landslide based on self-potential method

HU KaiYan^1,2,,
MO ChunYu²,
ZHANG YiHua²,
LI ShuangShuang²,
SUN JianWei²,
HAN Peng^2,,,
HUANG QingHua¹
1. Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China
2. Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen 518055, China


More Information

Corresponding author: HAN Peng,E-mail:hanp@sustech.edu.cn

MSC: P319;P631

--> Received Date: 10 March 2021
Revised Date: 14 May 2021
Available Online: 10 December 2021


摘要
摘要:降雨是诱发滑坡最主要的因素之一，认识雨水的渗流过程和地下水位的动态演化对滑坡的监测预警具有重要意义.基于动电机制，孔隙介质中的流体流动可产生自然电位，通过自然电位的观测可反演地下水动力过程，为滑坡稳定性分析及监测预警提供有效信息.本文基于室内小型滑坡控制实验平台，通过施加人工降雨模拟边坡雨水入渗过程，同步测量了在坡体内的自然电位、孔隙水压力和坡面变形数据.实验结果显示：（1）自然电位变化与孔隙水压力变化具有显著的相关性，自然电位的时移剖面可反映水在坡体内部的流动模式的演化；（2）表面变形发生在坡体下部饱和之后，即坡面变形滞后于自然电位与孔隙水压力变化.以上观测结果表明，自然电位在滑坡监测中具有潜在的应用价值.
关键词: 滑坡监测/
自然电位/
动电效应/
室内控制实验

Abstract:Rainfall is one of the critical factors to induce landslides, therefore understanding the process of rainwater infiltration and dynamic evolution of groundwater level is meaningful to the monitoring and early warning of landslides. Based on the electrokinetic mechanism, the pore water flow could produce self-potential (SP) responses. Examining the subsurface hydrodynamic process through the observed SP data may deliver insights for the monitoring and early warning of landslides. Relying on an indoor landslide experiment with imposing artificial rainfall to stimulate the rainwater infiltrating the slope, this work synchronously measures the variations of SP, pore-water pressure inside the slope, and the deformation variations at the slope surface. The experimental results show that (1) the SP response is evidently related to the pore pressure variation, which could reflect the evolution of the water flowing patterns inside the slope, and (2) the deformation of the slope surface occurs after the lower part of the slope reaching saturation, which means the surface deformation lagging behind the SP and pore water pressure changing. Our observations indicate that the SP method has great potential application in the monitoring of landslides.
Key words:Landslides monitoring/
Self-potential/
Electrokinetic effect/
Indoor controlled experiment



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