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基于大坪山隧道工程地质条件及可能穿越高地应力而带来的深部工程地质问题,结合钻孔有限测点的地应力测量结果,采用三维有限元分析方法对大坪山隧道的初始地应力场进行了拓展分析。通过建立三维地质模型,计算在自重应力、水平X、Y方向挤压和XY面剪切构造等4种工况下的构造应力场。用最小二乘法求解对应的回归系数及实测点的回归计算值,剔除不合理的测点,将计算值与实测值进行对比分析,采用Sufer软件绘制隧道洞轴线主应力等值线图,得出整个工程区特别是重要工程部位的回归初始地应力场。计算结果表明:测点回归值与实测值大部分吻合较好,反演回归得到的地应力场是合理的,符合实际的初始地应力场分布规律。
Based on the geotechnical conditions of Daping Mountain Tunnel and the deep engineering geological problems that may occur through the high ground stress, the initial geostress field of Daping Mountain Tunnel is analyzed by the three-dimensional finite element method Expand analysis. Through the establishment of three-dimensional geological model, the tectonic stress field is calculated under four kinds of working conditions: self-weight stress, horizontal X and Y extrusion and XY plane shear structure. The least square method was used to solve the corresponding regression coefficients and the calculated values of the measured points. The unreasonable measuring points were eliminated and the calculated values were compared with the measured values. Sufer software was used to draw the contour map of the main stress of the tunnel holes. The entire project area, especially important parts of the project to return to the initial stress field. The calculation results show that the measured values are in good agreement with the measured values. It is reasonable to invert the in-situ stress field and conform to the actual distribution of initial ground stress field.