苍岭特长公路隧道地应力场反演分析

通过对苍岭隧道工程区地应力场实测值分析基础上，选取可靠、具有代表性的实测点作为反演回归对象，利用三维数值分析手段，结合回归分析原理，获得整个工程区的地应力场分布情况，通过对比分析回归与现场实测值可知：除个别点差异较大外，其余大部分测点拟合程度较好，分布规律大致相同，表明采用应力回归方法的合理性。在此基础上，通过应力场回归方程获取了整个苍岭隧道轴线方向上地应力场展布规律，并根据不同地段最大主应力与隧道轴线方向的夹角对洞室稳定性状况进行了分析，据此建议进一步优化苍岭隧道线位走向，为设计、施工提供了重要的基础性资料。

Inverse analysis of in-situ stress field of Cangling super-long highway tunnel

Through analyzing the measured values of in-situ stress field of Cangling tunnel area,reliable and representative of the actual measured points are selected as the object of the inversion regression.Using 3D numerical analysis combining with principle of regression analysis,the entire project area in-situ stress field distribution is obtained.Through comparative analysis between the regression and local measured values,it is found that apart from individual point appears difference,most of the measured points fit well and the distribution laws are roughly the same.The results indicate that stress-regression method is reasonable.On this basis,by using the stress-regression equation,the Cangling tunnel’s in-situ stress field distribution rule along the axial direction is obtained,and according to the angles of different sections of maximum principal stress and the tunnel axes directions,the tunnel stability is analyzed.Accordingly,further optimization of the route position of Cangling tunnel is proposed,so as to provide important basic data for tunnel design and construction.