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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 study the surrounding rock stability of Shallow Underwater Tunnel under dynamic unloading, taking Liuyanghe tunnel project in Changsha as an example, two kinds of construction including three blasting excavation and mechanical milling excavation-controlled blasting are selected respectively Method, through the numerical simulation and measured monitoring data, analyzes the transient characteristics, dynamic effects and the influence of construction methods on the embankment during the unloading process of underwater tunnel excavation. The results show that the combination of mechanical milling and controlled blasting can effectively control the surrounding rock disturbance in the vertical direction and ensure the safety of tunneling construction under the embankment and unstable bed of geological body in practice. Reliability, in shallow buried tunnel practice has good practicality and promotion value.