岩溶隧道排水系统不同堵塞条件下衬砌结构力学特性
Mechanical characteristics of lining structure under different blocking conditions of drainage system of Karst tunnel
徐金华 1周华求 2熊文威 3王珑 4汪波 3钱王苹 5靖一峰3
作者信息
- 1. 西南交通大学交通隧道工程教育部重点实验室,四川成都 610031;浙江交投高速公路建设管理有限公司,浙江杭州 310000
- 2. 中铁一局集团第五工程有限公司,陕西宝鸡,721000
- 3. 西南交通大学交通隧道工程教育部重点实验室,四川成都 610031
- 4. 浙江交投高速公路建设管理有限公司,浙江杭州 310000
- 5. 西南交通大学交通隧道工程教育部重点实验室,四川成都 610031;南通大学交通与土木工程学院,江苏南通 226019
- 折叠
摘要
岩溶隧道在营运过程中常发生排水系统堵塞的问题,地下水不能及时排出会造成衬砌背后水压力快速增加,直接影响隧道衬砌结构的受力特性,严重情况时会危及隧道的正常营运.为进一步探究岩溶隧道排水系统堵塞时衬砌背后水压力分布规律及衬砌结构的受力情况,依托浙江临建(临安—建德)高速公路项目的岩溶区段隧道,采用FLAC3D软件对岩溶段隧道排水系统在不同堵塞率条件下的衬砌结构力学特性进行分析,同时建立室内渗流模型试验进一步验证数值模拟结果的合理性.研究结果表明:衬砌背后水压力随堵塞率增大而非线性增大,并可分为3个增长区,其中堵塞率为0％～40％时是快速增长区,堵塞率为40％～80％时是平稳区,堵塞率为80％～100％时是骤增区;相对于排水系统正常工作状态,完全堵塞状态条件下衬砌背后水压力最大值增加了162％,故将排水系统堵塞率为40％定为衬砌背后水压力的堵塞率控制阈值;衬砌结构应力增长无明显阶段性分区,整体上衬砌结构应力随堵塞率增大线性变化;完全堵塞状态条件下最小主应力与最大主应力最大值分别增加了149％与83％,排水系统无明显堵塞率阈值;在不同堵塞状态下,普通断面衬砌不同受力特征均呈对称分布,溶洞断面衬砌不同受力特征均呈非对称分布,且溶洞位置处受力特征对堵塞更加敏感;当岩溶隧道排水系统发生堵塞时,排水系统的排水能力会显著降低,隧道衬砌受力特性显著增加,尤其是在溶腔位置处;为保证依托岩溶隧道衬砌结构的安全性,排水系统在营运期清理维护工作应在堵塞率达40％之前完成.该研究结果可为今后岩溶隧道排水系统的管养时机提供理论依据与技术参考.
Abstract
The blockage of drainage system often occurs in the operation of Karst tunnels,and the water pressure behind the lining will increase rapidly,if the groundwater cannot be discharged in time,which will directly affect the mechanical characteristics of the tunnel lining and endanger the normal operation of the tunnel in serious cases.In order to explore the distribution law of water pressure and the stress of lining structure when the drainage system of Karst tunnel was blocked,the FLAC3D software was used to analyze the mechanical characteristics of the lining structure under different blockage rates of the drainage system based on the Karst tunnel of Zhejiang Lin-Jian(Linan to Jiande)Expressway Project.The results show that the water pressure behind the lining is increases nonlinearly with the increase of blockage rate,and can be divided into three growth rate intervals.The blockage rate of 0％to 40％is the first rapid growth interval,the blockage rate of 40％to 80％is the stable interval,and the blockage rate of 80％to 100％is the second sudden increase interval.Compared with the normal working state of the drainage system,the maximum water pressure behind the lining increases by 162％under the condition of complete blockage,so the blockage rate of the drainage system is 40％as the control threshold of the water pressure behind the lining.The stress growth of lining structure has no obvious stage division,and the stress of lining structure changes linearly with the increase of blockage rate.The maximum values of minimum and maximum principal stresses is increase by 149％and 83％respectively under the condition of complete blockage,and there is no obvious threshold of blockage rate in the drainage system.Under different blockage conditions,the mechanical characteristics of the common section lining are symmetrical,while the mechanical characteristics of the Karst cave lining are asymmetrical,and the stress characteristics of the Karst cave location are more sensitive to the blockage rate.Therefore,when the Karst tunnel drainage system is blocked,the drainage capacity of the drainage system will be significantly reduced,and the mechanical characteristics of the tunnel lining will be significantly increased,especially at the location of the cavity.In order to ensure the safety of the lining structure of Karst tunnel,the drainage system should be cleaned and maintained before the blockage rate of 40％.It can provide theoretical basis and technical reference for the management and maintenance opportunity of drainage system of Karst tunnel.3 tabs,21 figs,25 refs.
关键词
隧道工程/排水系统堵塞状态/数值模拟/堵塞率/力学特性/控制阈值Key words
tunnel engineering/blocking condition of drainage system/numerical simulation/blockage rate/mechanical characteristic/control threshold引用本文复制引用
基金项目
浙江省交通厅科技项目(2021051)
高铁联合基金重点项目(U1734205)
国家自然科学基金(52208395)
出版年
2024
NETL
NSTL
维普
万方数据