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- 2018
哈尔滨地铁粉质黏土力学性质与超前支护方式
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Abstract:
摘要： 依托哈尔滨地铁项目,进行不同含水率情况下的粉质黏土的力学性质和超前支护方式选择研究。通过对哈尔滨地铁土样进行室内性质试验,包括含水率试验、土三轴试验等,确定哈尔滨地铁土样为粉质黏土及得到了不同含水率试样的力学性质,并通过液性指数对哈尔滨地铁隧道围岩进行亚级级别划分;介绍哈尔滨地铁现场监测的情况,包括现场位移与应力监测,并将监测数据与数值模拟结果进行对比,确定了数值模拟的正确性;进行不同地层参数与不同超前支护情况下的数值模拟,通过对比不同情况下的位移、应力、应力路径以及塑性区大小,得到不同等级围岩情况下的隧道超前支护方式的选择。本研究对于哈尔滨地铁隧道超前支护方式的选择具有一定的指导意义。
Abstract: Based on the Harbin Metro project, the mechanical properties of the silty clay and the selection of the advanced support method were studied with different water content. Through the laboratory tests, including water content test and triaxial test, the type of soil samples from Harbin Metro tunnel was identified as the silty clay and the mechanical properties of soil samples with different water content were determined, and the silty clay of Harbin Metro tunnel was sub-classified according to liquid index. Field monitoring was performed to calibrate the water content-dependent deformation and strength parameters used in the numerical simulations, and the correctness of numerical simulation was confirmed. Numerical simulation was performed with different soil parameters and different support method, and the selections of the tunnel advanced support method with different parameters were obtained by comparing the displacement, stress, stress path and the area of the plastic zone under different conditions. The obtained results could give some help for the selection of the advanced support method of Harbin metro tunnel
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