襄渝铁路增建二线——新白岩寨隧道地应力测量及其在岩爆分析中的应用

In-Situ Stress Measurement and Its Application to Rock Burst Analysis in Xinbaiyanzhai Tunnel of the Xiangyu Railway

本文在襄渝增建二线———新白岩寨深埋长隧道(最大埋深近500m)工程区进行了水压致裂地应力测量,叙述了地应力测试方法和结果。测量结果表明:该工程区的原地应力以水平应力为主,最大主应力方向为NNW,与区域地质分析的结果相吻合。根据该工程区应力量值及其方向,分析了隧道区应力作用特征,并结合该工程区地质条件,对隧道的稳定性和地质灾害发生的可能性进行了讨论。

Using the hydraulic pressure fracturing method, the authors measured the in-situ stresses of Xinbaiyanzhai tunnel whose greatest burial depth is nearly 500 m along the second line of the Xianyu Railway. The results show that the horizontal stress is predominant. The direction of the maximum primary stress is NNW, in good agreement with the result of regional analysis. According to the stress state, the probability of rock burst is discussed.