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岩爆是一种极为复杂的动力失稳现象.在深埋隧洞的勘察设计和施工过程中,高地应力及其诱发的频繁岩爆,是影响隧道洞室稳定的重要因素之一.作为四川雅砻江锦屏二级水电站的重要的临时工程,施工排水洞在进入埋深1600 m后就发生多次岩爆,严重制约了工程的进展,为了研究岩爆发生机理与高地应力之间的关系以及更好地预测岩爆在隧洞内发生的位置,运用渐进破坏过程数值分析软件RFPA(realistic failure process analysis)对施工排水洞进行初步的应力分析,得出与现场实测相吻合的初始地应力拟合曲线.同时,隧洞开挖引起应力重分布而产生的围岩破坏的数值模拟也很好的印证了现场发生的岩爆情况,表明基于渐进破坏过程数值分析的RFPA可以真实地模拟高地应力下岩爆机理.
Rockburst is an extremely complicated phenomenon of dynamic instability.Highland stress and its frequent rockburst are the important factors affecting the stability of tunnel caverns during the investigation, In the important temporary project of Jinping II hydropower station in Yongjiang River, many rock burst occurred after the construction drainage tunnel reached the depth of 1,600 m, which severely restricted the progress of the project. In order to study the relationship between the mechanism of rockburst and the high ground stress and more The location of the rock burst in the tunnel is well predicted. The initial stress analysis of the drainage tunnel is carried out by using the realistic failure process analysis (RFPA) software, and the initial curve fitting of the ground stress is obtained. At the same time, numerical simulation of surrounding rock failure caused by stress redistribution caused by tunnel excavation also well confirms the rock burst occurred in the field, indicating that the RFPA based on the numerical analysis of progressive failure process can simulate the rockburst under high ground stress mechanism.