引汉济渭工程秦岭隧洞岩爆数值模拟与岩爆预测研究

Research on Numerical Simulation and Prediction of Rock Burst at Qinling Tunnel in the Yinghan-Weihe River Project

以引汉济渭秦岭隧洞工程为研究对象,针对工程埋深大、地应力高和地质条件复杂的特点,进行高地应力条件下超长深埋隧洞岩爆的数值模拟预测研究。基于隧洞围岩工程力学性质和原始地应力反演数据,通过数值模拟技术,运用离散元法软件(3DEC),对研究区域的五个代表性埋深段进行隧洞开挖数值模拟,分析开挖后围岩的二次应力、位移变化和破坏情况。选择五种不同的岩爆判据对围岩岩爆等级进行预测,并将综合评判结果与实际岩爆发生情况对比。研究表明,基于离散元计算预测岩爆的方法是可行的,预测岩爆等级与实际岩爆发生情况基本吻合。

Qinling tunnel from Hanjiang River to Weihe River diversion project as the study object, the numeri-cal simulation prediction of deeply-buried tunnel rock burst on the condition of high in-situ stress was studiedin connection with the deeply buried project, high in-situ stress and complicated geological feature. The tunnelexcavation data was simulated for five representative deeply-buried segments by the discrete element methodsoftware（3DEC） based on the engineering mechanics properties of the tunnel surrounding rock and the originalin-situ stress inversion data and secondary stresses, displacement and damage of surrounding rock were ana-lyzed. Five different types of rock burst criterion were applied to predict the rock burst proneness and the com-prehensive evaluation results were compared with actual monitoring data in the paper. The results showed thatthe method of calculating rock burst is feasible, and the prediction of the rock burst is basically consistent withthe actual rock burst.