水压致裂地应力测试方法在云南大理—丽江铁路隧道工程中的应用

Application of hydraulic fracturing in-situ stress measurements in tunneling along the Dali-Lijiang Railway, Yunnan, China

利用水压致裂地应力测试方法对实际工程区进行了地应力测量,确定了工程区隧道围岩现今的地壳应力状态,即原地应力的大小和方向。根据地应力分布特征,分析了隧道开挖过程中发生岩爆等地质灾害的可能性。地应力测量数据的分析结果可作为隧道衬砌的设计、断面的选择及轴线方位的确定的科学依据。

Hydraulic fracturing in-situ stress measurements have been applied in the engineering region of the Dali-Lijiang Railway. This method has determined the present stress state of the earth＇s crust, i.e. the magnitude and direction of the insitu stress, in the tunnel wall rocks in the engineering region. According to the distribution features of the in-situ stress, the paper analyzes the possibility of rock burst during the excavation of the tunnel. The analytic results of the measuring data may serve as the scientific basis for the lining design, section choice and axis azimuth definition of the tunnel.