摘要
为研究浅埋水下隧道在动态卸载作用下的围岩稳定性,以长沙市浏阳河隧道工程为例,分别选择三台阶钻爆开挖与机械铣挖—控制爆破相结合开挖两种施工方法,通过数值仿真与实测的监控数据,分析了水下隧道开挖卸荷过程的瞬态特性、动力效应及施工方法对河堤的影响。结果表明,机械铣挖—控制爆破相结合开挖能更有效地控制竖直方向上的围岩扰动,实践中确保了下穿河堤与地质体不稳定河床地段的隧道掘进施工的安全性和可靠性,在浅埋水下隧道实践中具有良好的实用性和推广价值。
In order to research the surrounding rock stability of shallow underwater tunnel at the action of dynamic unloading,according to numerical simulation and real-time monitoring data,three-benching tunnelling method of explosive excavation and combination excavation method of milling-dig and controlled blasting are chosen to analyze the influence of transient characteristics,dynamic effects and construction method on the dike by taking the Liuyanghe tunnel project in Changsha City for an example.The results show that combination excavation method of milling-dig and controlled blasting can control vertical disturbance of surrounding rock effectively and ensure safety and reliability of tunnel mining for unstable geologic river bed and dike,which has good practicability and popularization value in shallow underwater tunnel project.
出处
《水电能源科学》
北大核心
2011年第9期119-122,共4页
Water Resources and Power
基金
湖南省教育厅计划基金资助项目(10C1285)
关键词
水下隧道
瞬态卸荷
钻爆法
机械铣挖
underwater tunnel
transient characteristics of excavation unloading
coring and blasting method
milling and dig method
