摘要
为解决季节性岩溶隧道在持续降雨条件下结构失稳问题,通过总结分析部分既有季节性岩溶隧道结构失稳案例发现:持续强降雨对岩溶隧道地下水的充分补给,会短时间内导致衬砌水压力迅速上升,甚至超过衬砌结构承载能力,造成衬砌结构失稳破坏。基于隧址区瞬时降雨量、累积降雨量、降雨持续时间等降雨参数与隧道衬砌结构内力之间的对应关系,利用神经网络工具,建立降雨条件下季节性岩溶隧道结构安全预警体系。设计出一种当衬砌水压力达到衬砌结构容许水压力后可实现自动泄水降压的装置,避免了降雨条件下衬砌结构因短时间内承受水压过大而发生结构失稳破坏的现象,保障了岩溶隧道结构安全。研究成果可为季节性岩溶隧道设计、施工以及运营维护提供参考。
In order to solve the structural instability problem of seasonal karst tunnel under continuous rainfalls,by summarizing and analyzing some cases of seasonal karst tunnel structural instability,it was found that continuous heavy rainfalls can fully recharge the groundwater in karst tunnel,causing that the lining water pressure rises sharply in a short time and even exceeds the bearing capacity of the lining structure,and resulting in the instability and damage to the lining structure itself.Based on the congruent relationship between the rainfall parameters such as instantaneous rainfall,cumulative rainfall and rainfall duration in tunnel site area and the internal forces of the tunnel lining structure,a neural network tool was used to build up a safety early-warning system for seasonal karst tunnel structures under rainfall conditions.A device is designed which is able to automatically discharge the water and relieve the pressure when the lining water pressure reaches up to the allowable water pressure value,it can avoid such phenomenon of instability and damage to the lining structure due to bearing the excessive water pressure in a short time,guaranteeing the safety of karst tunnel structure.The research results can provide a reference for design,construction and operation&maintenance of seasonal karst tunnels in future.
作者
郑波
吴剑
郭瑞
ZHENG Bo;WU Jian;GUO Rui(China Railway Southwest Research Institute Go.,Ltd.,Chengdu 611731;Sichuan Tunnel Safety Research Center of Engineering and Teehnology,Chengdu 611731)
出处
《现代隧道技术》
EI
CSCD
北大核心
2019年第S02期67-72,共6页
Modern Tunnelling Technology
基金
中国中铁股份有限公司科技开发计划(2017-重点-19-2)
关键词
季节性岩溶隧道
水压力
预警技术
泄压装置
防治对策
Seasonal Karst tunnel
Water pressure
Early-warning technology
Pressure-relieving device
Prevention countermeasures
作者简介
郑波(1980-),男,博士,教授级高级工程师,主要从事隧道及地下工程科研与技术咨询工作,E-mail:my1390@126.com.
