水压致裂法在大巴山深埋隧道地应力测试中的应用

PPLICATION OF HYDRAULIC FRACTURING METHOD IN IN-SITU STRESS MEASUREMENT OF DABA MOUNTAIN DEEP BURIED TUNNEL

大巴山地区地质构造复杂,目前建设的隧道多为深埋隧道。了解地应力条件对隧道施工设计参数的选择以及岩爆的风险预测具有重大意义。选择水压致裂法,以大巴山区域旗杆山隧道为例,介绍了水压致裂法测试深埋隧道地应力的方法,并对测试结果数据进行分析,从而对该隧道施工期间发生岩爆的可能性进行预测。实践表明,运用水压致裂法,能较为准确地测量到深埋隧道相关施工区域的地应力分布特征,同时具有施工周期短,施工操作简单的特点。

The geological structure in Daba mountain area is complex,and most of the tunnels under construction are deep buried tunnels.Understanding the ground stress conditions is of great significance to the selection of tunnel construction design parameters and the risk prediction of rock burst.In this study,the hydraulic fracturing method is selected.Taking the Qigan mountain tunnel in Daba mountain area as an example,the method of hydraulic fracturing to test the ground stress of deep buried tunnels is introduced,and the test results are analyzed,so as to predict the possibility of rock burst during the construction of the tunnel.The practice shows that the method of hydraulic fracturing can accurately measure the distribution characteristics of ground stress in the relevant construction areas of deep buried tunnels,and has the characteristics of short construction period and simple construction operation.