浅埋近接隧道施工地表沉降有限元分析

结合浅埋隧道工程地质和支护设计特点，应用大型有限元软件（ANSYS7．0）模拟了浅埋隧道近接施工的地表沉降曲线，并与现场实测资料进行了对比分析，得出多洞室施工的地表沉降量是单洞室沉降量的2～3倍，尤其是隧道上台阶的开挖对地表土体的扰动更为严重，从而证明了地表深层注浆的必要性。同时，通过对实测资料的回归分析，得出地表沉降与时间的关系曲线，对现场施工有着很重要的指导意义。

Analysis on the settlement of ground surface in the construction near to shallow tunnel with finite element method

The settlement curve of ground surface near to the shallow tunnel is simulated in this paper by using large finite element software, ANSYST. 0, in combination with the engineering geology and the features of support design, compared to the measured data. The settlement of ground surface for the multi-cell construction is 2-3 times larger than that of single-cell, especially more serious in excavation on the steps upon the tunnel to disturbance of earth body of ground surface, thus showing it is necessary to grout to deep ground surface. At the same time, the relation curve of the settlement of ground surface vs. time was obtained through the regression analysis on the measured data, and it is of great importance to guide the field construction.