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利用北京地铁十号线某段的重塑黏质粉土试样,采用英国GDS的多功能静三轴仪分别进行了固结排水和固结不排水的三轴压缩试验,得到了该种土的应力-应变曲线,并给出了土的抗剪强度指标与模型参数。基于通用有限元软件ABAQUS使用Mohr-Coulomb模型、Druker-Prager模型和修正剑桥模型模拟了土样三轴试验的破坏过程,分析了剪胀特性对土样破坏形式的影响,结果表明修正剑桥模型不能反映土的剪胀特性,而Mohr-Coulomb模型、Druker-Prager模型则过大地考虑了土的剪胀特性;考虑剪胀性的模型计算固结排水情况易出现剪切带,而不能考虑剪胀性的模型计算固结不排水情况易出现剪切带。
Using the remodeled clayey silt samples from a certain section of Beijing Subway Line 10 and the triaxial compression tests of consolidated drainage and consolidation undrained by the multifunctional static triaxial apparatus of British GDS, The stress-strain curve is given, and the shear strength index and model parameters of soil are given. Based on the finite element software ABAQUS, the Mohr-Coulomb model, the Druker-Prager model and the modified Cambridge model were used to simulate the failure process of the soil sample triaxial tests. The influence of the dilatancy characteristics on the failure modes of soil samples was analyzed. The results show that the modified Cambridge model can not Reflect the dilatancy characteristics of soil, while the Mohr-Coulomb model and Druker-Prager model consider the dilatancy characteristics of soil too much; shear modulus is easy to appear in the calculation of consolidated drainage considering the dilatancy model, and dilatancy can not be considered The shear modulus is prone to appear in the sexual model when the consolidated undrained condition is calculated.