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针对北京地区典型粉质黏土地层隧道开挖问题,进行了多组三轴固结排水试验,分析了不同类型应力路径下土样的力学特性,并建立隧道开挖二维数值模型.选取一般工程材料参数,计算每步开挖下网格点及高斯点的应力,跟踪记录典型样点的应力变化规律,进而将地层划分为不同作用分区,将强度试验结果依次代入对应模型分区后得出考虑分区的地表最终沉降值.最后构建离心机试验模型,记录稳定后的表面沉降值,对比了分区模拟计算结果,验证了隧道开挖下地层作用分区的正确性.
Aiming at the problems of tunnel excavation in typical silty clay strata in Beijing area, a series of triaxial consolidation drainage tests were carried out, the mechanical characteristics of soil samples under different types of stress paths were analyzed, and a two-dimensional numerical model of tunnel excavation was established. Material parameters, calculate the stress of grid points and Gauss points under each step of excavation, and track the stress variation of typical sample points. Then the strata are divided into different function zones, and the results of strength test are substituted into the corresponding model zones in turn to be considered Finally, the centrifuge test model was constructed and the surface sedimentation value was recorded. The simulation results were compared with the results of the simulation to verify the correctness of the formation sub-region under the tunnel excavation.