云南勐捧隧道地应力场研究分析

Research on In-situ Stress Field of Yunnan Mengpeng Tunnel

为了解云南勐捧隧道洞身部位的地应力状况,采用水压致裂应力测量方法在2个钻孔中进行原地应力测量和应力方向印模测定,分析测点附近主应力方向和应力场状态。依据隧道工程区周边区域的应力数据,基于Hoek-Brown准则和RocLab对工程区的岩体强度以及变形模量进行了估算,结合工程附近地应力随深度变化,运用Sheorey模型对工程区地应力状态进行预测,预测结果与该区域周边的应力值整体较一致。

In order to understand the in-situ stress status of the Mengpeng tunnel body in Yunnan,the hydraulic fracturing stress measurement method was used to carry out in-situ stress measurement and stress direction impression measurement in two boreholes,and analyze the principal stress direction and stress field state near the measuring point.Relying on the stress data of the surrounding area of the tunnel engineering area,the rock mass strength and deformation modulus of the engineering area were estimated based on the Hoek-Brown criterion and RocLab.The nearby ground stress varies with depth,the Sheorey model was used to predict the in-situ stress state in the engineering area.The predicted result is more consistent with the overall stress value around the area.