蓝家岩隧道初始地应力测量及应用

THE INITIAL CRUSTAL STRESS MEASUREMENT AND APPLICATIONS OF LANJIAYAN TUNNEL

为指导蓝家岩隧道变形预测、合理选择支护参数、安全施工,本文简要介绍了应力解除法测量地应力的基本原理及试验步骤,采用空心包体套孔应力解除法对不同埋深隧道现场地应力实测,通过对钻孔应力解除测试结果分析,得出该隧道部分区间的地应力分布规律:蓝家岩隧道为高地应力隧道,最大主应力方向与隧道轴向垂直,不利于隧道稳定。最大水平主应力方向与岩层走向基本一致,最小水平主应力方向与岩层倾向基本一致。采用Hoek公式预测变形,优化软弱围岩大变形的控制措施,选择合理的支护参数,确保安全施工。

To guide the supporting parameters rational selection,the deformation prediction and safe construction of the Lanjiayan tunnel,this essay briefly introduce the theory and the measure method of stress relieving to measure the crustal stress. And the method used to measure crustal stress of some section of the tunnel,and then according the analysis of results,it can be got the summary: the Llanjiayan tunnel belongs to high crustal stress tunnel,and the first stress perpendicular to the axial of tunnel. The direction of maximum horizontal principal stress is basically the same as that of rock,and the minimum horizontal principal stress direction is basically the same as that of rock strata. And according the results,the Hoek formula is used to predict the deformation,and to optimize the control measures of large deformation of soft surrounding rock,and to select reasonable parameters,to ensure the safe construction.