温州地区典型软土蠕变特性试验研究

Experimental Research on Creep Properties of Typical Silt in Region of Wenzhou

基于软土的常规三轴固结排水蠕变试验成果,研究了温州地区原状软土的蠕变力学特性,分析了其轴向蠕变规律。蠕变试验采用分别加载的方式进行,得到了原状软土在不同应力状态下的蠕变试验曲线,在此基础上,得到原状软土的应力～应变等时曲线。采用Merchant模型与Burgers模型对土样的蠕变曲线进行拟合,确定模型参数,建立了适用于温州地区的软土的蠕变本构模型,并对两种模型的计算结果与软土的三轴蠕变试验结果进行了对比分析。计算结果表明,Burgers模型比Merchant模型更吻合蠕变试验结果。

Based on the consolidation-drained triaxial shear test results of silt,the creep mechanical properties of undisturbed silt in Wenzhou are studied,and the axial creep rules are analyzed.The creep test is carried out by means of separate loading,and the creep test curve of the original sludge under different stress states is obtained.On this basis,the stress-strain isochronous curve of the undisturbed silt is worked out.The creep curves of soil samples are fitted by Merchant model and Burgers model to determine the parameters of these model.The creep constitutive model for the silt in Wenzhou is established,and the results of the two models with the triaxial creep test results of the silt are compared.The calculation results show that the Burgers model is more consistent with the results of the creep test than the Merchant model.