深埋山岭隧道地应力测试与分析研究

In-situ Stress Test and Analysis of Deep Buried Mountain

高地应力常对深埋山岭隧道建设造成诸多问题。通过对登楼山隧道DZK2钻孔采用水压致裂法进行地应力测试,系统分析DZK2钻孔的地应力测试结果,得出测试深度范围的应力实测值与应力场方向,并通过修正的Sheorey模型预测隧道其他埋深范围的应力分布。研究分析表明,在隧道工程区地壳浅部水平应力占主导地位,即主要受构造水平应力作用,应力大小随着埋深的增大而增大,该应力场与区域构造应力场基本一致。

High ground stress often causes many problems in the construction of deep buried mountain tunnels.The in-situ stress of DZK2 borehole in Dengloushan Tunnel is tested by hydraulic fracturing method,and the test results are systematically analyzed.The measured stress value and the direction of stress field in the test depth range are obtained,and the stress distribution in other buried depth ranges of the tunnel is forecasted by the modified Sheorey model.The analysis shows that the horizontal stress is dominant in the shallow crust of the tunnel engineering area,and the stress state increases with the increase of the buried depth.The stress field in the engineering area is mainly affected by the tectonic horizontal stress,which is basically consistent with the large regional tectonic stress field.