初始地应力场是岩土工程设计和施工所要考虑的首要因素。依托十房(十堰至房县)高速通省隧道地应力量测资料,调整不同组合的侧压系数,获得了隧址区岩体多组地应力。利用残差函数,分别计算了各向同性与各向异性本构关系下每一组侧压系数的残差,并进行了对比分析,确定了不同本构关系的最优侧压系数。利用获得的侧压系数,反演计算测试点的地应力,通过与实测结果的对比分析确定了与隧址区岩体适宜的本构关系,最终得到了隧道的初始地应力场分布规律。研究表明,初始地应力场与隧道的埋深和地形地貌有关,且通省隧道更适于在各向异性本构关系下进行地应力场反演,误差幅值约为10%。

Initial in-situ stress is a primary factor for the design and construction in rock engineering. According to the data of Tongsheng tunnel of Shiyan-Fangxian express highway, different groups of in-situ stress in the tunnel site were acquired by adjusting lateral pressure coefficient. The residuals of different lateral pressure coefficients in isotropic and anisotropic constitutive relations were calculated by constructing a residual function. Through comparing and analyzing the results, the optimal lateral pressure coefficient for the tunnel site was confirmed. Furthermore, the in-situ stress of metamorphic rock at test points was retrieved.The constitutive relation of rock mass at the tunnel site was determined through comparison with measured values. Finally the distribution of in-situ stress field of the tunnel was obtained. The research shows that the initial in-situ stress field is related to the buried depth and the topography of tunnel. The anisotropic constitutive relation is adaptive for Tongsheng tunnel and the error is about 10%.