隐伏富水溶洞对隧道围岩稳定性影响分析:以云南云盘山隧道为例
Analysis on Influence of Hidden Water-rich Karst Cave on Stability of Tunnel Surrounding Rock:Taking Yunnan Yunpan Mountain Tunnel as an Example
刘克瑾 1袁铮 1姚辉江 1郜现磊2
作者信息
- 1. 河南工业大学土木工程学院,郑州 450001
- 2. 中建七局一公司,郑州 450016
- 折叠
摘要
为研究岩溶隧道开挖过程中隐伏充水溶洞引起的围岩稳定性问题,依托云南营盘山隧道工程,以溶洞尺寸、水压以及与隧道间净距三种因素为研究对象,结合新型的三维雷达探测技术,并采用PLAXIS 3D进行数值模拟,分析了隧道各监测点位移、应力场的变化规律和影响效应.结果表明:隧道开挖会使应力场发生变化,隧道拱顶、拱腰处的围岩以压应力为主,隧道仰拱下方的围岩以拉应力为主,各部分的应力变化也是导致围岩向隧道内扩张的主要原因;单一变量下,隧道半径为5 m时,位移、应力的变化最大,溶腔内水压增加至500 kN/m2时,位移、应力所受影响最大,溶洞与隧道的净距达到3 m时,位移、应力场变化尤为明显;围岩稳定性对溶洞尺寸、水压以及与隧道间净距的敏感程度存在差异,大小为隧道与溶洞净距＞溶腔水压＞溶洞尺寸,可为相似工程的安全施工提供参考.
Abstract
In order to study the stability of surrounding rock caused by hidden water-filled caverns in the excavation process of karst tunnels,relying on the Yingpan Mountain Tunnel Project in Yunnan,taking the size of the cavern,the water pressure and the net dis-tance between the tunnel and the three factors as the object of study,combining the new three-dimensional radar detection technology,and numerical simulation using PLAXIS 3D,to analyze the change rules of the tunnel's various monitoring points of the displacement,the stress field,and the influence of the effect of the change rules.The results of the study show that:tunnel excavation will cause changes in the stress field,the surrounding rock at the tunnel arch and arch waist is dominated by compressive stress,and the sur-rounding rock under the tunnel elevation arch is dominated by tensile stress,and the changes in the stress of each part of the tunnel are also the main reasons for the expansion of the surrounding rock into the tunnel.Under a single variable,the changes in displacement and stress are greatest when the radius of the tunnel is 5 m,and the changes in displacement and stress are most significant when the water pressure in the cavern is increased to 500 kN/m2.When the clear distance between the cavity and the tunnel reaches 3 m,the change of displacement and stress field is especially obvious.There are differences in the sensitivity of the surrounding rock stability to the size of the cavern,water pressure,and the clear distance between the tunnel and the cavern,with the size of the clear distance be-tween the tunnel and the cavern＞water pressure in the cavern＞size of the cavern,which can be used as a reference for the safety of the construction of similar projects.
关键词
隧道/隐伏溶洞/富水围岩/定性/数值模拟Key words
tunnel/concealed karst cave/water-rich surrounding rock/stability/numerical simulation引用本文复制引用
基金项目
河南省科技攻关计划(182102310865)
出版年
2024
NETL
NSTL
万方数据