地表水体下隧道涌突水过程的自然电位响应模拟研究——以珠海石景山隧道为例  

Simulation of the self-potential response during the water inrush of tunnel beneath surface water:a case study of Shijingshan tunnel in Zhuhai

作　　者：黄民尧 凌成鹏[1,2] 邓富祥 李桦柳 傅志杰 HUANG MinYao;LING ChengPeng;DENG FuXiang;LI HuaLiu;FU ZhiJie(College of Environment and Civil Engineering,Chengdu University of Technology,Chengdu 610059,China;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology),Chengdu 610059,China)

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]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

出　　处：《地球物理学进展》2024年第3期1275-1284,共10页Progress in Geophysics

基　　金：国家自然科学基金(41402268);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)自主研究课题(SKLGP2018Z022)联合资助。

摘　　要：涌突水是复杂地质区域隧道开挖过程中遭遇的主要地质灾害之一.当隧道穿越地表水体之下并沟通断裂破碎带时,隧道掌子面处极易发生涌突水灾害,造成施工人员伤亡,并延缓施工进度.本文基于自然电位法基础理论,以珠海市石景山隧道为研究对象,采用数值模型模拟隧道涌突水过程,讨论了不同工况隧道纵横断面处自然电位响应特征.结果表明:沿地下水径流方向,自然电位响应逐渐增强,在掌子面处达到极大值105.3 mV.自然电位响应与地下水流速、涌水量呈线性关系.隧道纵横断面自然电位响应与水头呈负相关关系.本研究表明自然电位响应规律可以有效指示隧道施工引起的地下水流场变化,进而作为隧道涌突水灾害预警的有效信息.Water inrush is one of the most serious geological hazards during tunnel excavation in complex geological areas.If there was the surface water,the excavation of tunnel could cause the water inrush when crossing the fracture zone.The water inrush in tunnel endangers the safety of workers and slows the progress of construction.In this paper,a numerical model was used to simulate the process of water inrush and self-potential response in the Shijingshan tunnel at Zhuhai City,based on the fundamental theory of the self-potential method.The distribution characteristics of the self-potential field at the tunnel's longitudinal and transverse sections under various working conditions are explored.The results show that the self-potential increases along the path of groundwater flow and reaches the maximum value of 105.3 mV at the tunnel face.The self-potential signals are proportional to the groundwater flow velocity as well as the flow rate.The self-potential signals in the tunnel's longitudinal and transverse sections are inversely proportional to the water head.This study demonstrates that the self-potential response could effectively identify changes in the groundwater flow field induced by tunnel excavation,which means it could be used as an effective early warning method for the water inrush of tunnel.

关 键 词：隧道 涌突水 自然电位响应 地下水流场 地表水体 

分 类 号：P631[天文地球—地质矿产勘探]