软黏土固结变形特性及数值模拟验证

Consolidation deformation characteristics and numerical simulation validation of soft clay

软黏土在我国沿海地区广泛存在,且物理力学特性复杂。通过现场取样进行室内试验,研究土体的各种力学特性,并选取合适的参数进行数值计算,模拟模型试验中土体的固结变形及其演化规律,解释试验中的一些特殊现象,得到一些重要结论。在固结变形中,超软淤泥的特殊力学特性使得土体越渗越密,越密越难渗,表现出与其他土体不同的固结特性,因此,必须考虑土体渗透系数随土体孔隙比变化和土体非线性的力学特征等规律。

The soft clay exists widely in the coastal areas of China,and its physical property is very complicated.Through the laboratory test based on the site sampling,we studied the mechanical properties of soft clay and carried out a numerical simulation by selecting proper parameters,simulating the consolidation deformation and evolution law of soft clay in the model test,explaining some special phenomena appeared in the test,and drew some significant conclusions.In the course of the consolidation deformation,due to the special mechanical property of ultra-soft clay,the clay body becomes denser and denser accompanying the seepage,and it becomes more and more difficult to seep when it turns denser,which appears a different consolidation characteristics comparing with other soils.Thus,we shall consider the law that the seepage coefficient varies with the change of the void ratio and the non-linear mechanical property of the clay.