摘要
为探究非对称渗流边界条件下小净距隧道渗流-应力场特征及衬砌结构的安全性,以深圳莲塘隧道为工程背景,开展小净距隧道渗流模型实验,并结合模型试验与相似模拟的方法,分析单侧水源条件下小净距隧道围岩渗流水压力分布规律,并揭示不同补水距离条件下渗流场的演化规律和衬砌的安全性.结果表明:在单侧水源条件下,小净距隧道围岩渗流场呈现出显著的非对称分布,从补水边界到另一侧水位面呈非线性降低,在隧道附近的围岩中水压力在水平方向呈非对称的“W”形分布;围岩渗流场的非对称分布导致了左右洞水压力、排水量和安全系数的非对称;与远离水源的隧道相比,靠近水源的隧道平均水压力和排水量分别增大10.4%和5.5%,安全系数减小3.0%,并且水压力的非对称性更显著;从施工期到运营期,围岩和衬砌水压力分布的非对称性有小幅度增大;随着补水距离的增大,衬砌水压力线性减小,安全系数增大,水压力非对称系数增大;研究结果可为富水地区非对称渗流边界隧道的施工和运营提供一定的参考.
To study the characteristics of the seepage-stress field and the safety of the lining structure of small interval tunnels under asymmetric seepage boundary conditions,based on the Liantang Tunnel in Shenzhen,China,a seepage model experiment for the small interval tunnels was developed.In addition,through model experiment and analog simulation,the distribution law of seepage water pressure in the surrounding rock of the small interval tunnels under unilateral water source conditions was analyzed,and the evolution law of the seepage field and the safety of the lining at different distances from the water sources were revealed.The results indicate that the surrounding rock seepage field of the small interval tunnels exhibits a significant asymmetric distribution under unilateral water source conditions.The water level decreases nonlinearly from the water replenishment boundary to the other side.Besides,the water pressure in the surrounding rock near the tunnels is distributed in an asymmetric“W”shape.The asymmetric distribution of the surrounding rock seepage field leads to the asymmetry of water pressure,water inflow,and safety coefficient in the left and right tunnels.Compared with the tunnel farther from the water source,the average water pressure and water inflow of the tunnel closer to the water source increases by 10.4%and 5.5%,respectively,and the safety coefficient decreases by 3.0%.Moreover,the water pressure asymmetry of the tunnel closer to the water source is more significant.The asymmetry of water pressure distribution in the surrounding rock and lining slightly increases from the construction period to the operation period.As the distance from the water sources increases,the water pressure of the lining linearly decreases,and the safety coefficient and the asymmetry coefficient of the water pressure increase.The research results can provide a reference for the construction and operation of tunnels with asymmetric seepage boundaries in water-rich areas.
作者
喻炳鑫
陈子全
何川
李铮
蔡鹏麟
张航
YU Bingxin;CHEN Ziquan;HE Chuan;LI Zheng;CAI Penglin;ZHANG Hang(Key Laboratory of Transportation Tunnel Engineering of Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China;Chongqing City Construction Investment(Group)Co.,Ltd.,Chongqing 400023,China)
出处
《西南交通大学学报》
北大核心
2025年第3期618-627,共10页
Journal of Southwest Jiaotong University
基金
国家自然科学基金项目(52378415)
重庆市技术创新与应用发展专项(CSTB2024TIAD-KPX0065)
重庆英才计划(CSTC2021YCJH-BGZXM0246)。
关键词
小净距隧道
非对称渗流边界
水源距离
渗流
结构安全
small interval tunnels
asymmetric seepage boundary
distance from water source
seepage
structural safety
作者简介
第一作者:喻炳鑫(1996-),男,博士研究生,研究方向为隧道与地下工程,E-mail:ybx2021@my.swjtu.edu.cn;通信作者:陈子全(1989-),男,副教授,研究方向为隧道与地下工程,E-mail:chenziquan@swjtu.edu.cn。
