Hydro-Mechanical Processes due to Mechanized Tunneling in Soft Clay Rock (A05)

A5子项目通过数值模型、考虑实际的力学和水力边界条件以及实验室实验，研究了机械化掘进过程本身引起的膨胀(因此有问题的)粘土岩石的物理和力学性质变化与粘土膨胀行为之间的相互作用。在一系列实验的基础上，建立了一个本构关系，将饱和程度和吸力作为状态变量来描述膨胀压力。最后，将采用模型自适应的方法来降低数值模型的复杂性。

Subproject A5 investigates interactions between changes of the physical and mechanical proper-ties of swelling (and thus problematic) clay rock, induced by the mechanized tunneling process itself, and the swelling behavior of the clay by means of numerical models, considering realistic mechanical and hydraulic boundary conditions, as well as laboratory experiments. A constitutive relationship will be developed, based on a series of experiments, to describe the swelling pressure in terms of the degree of saturation and the suction as state variables. Finally, methods of model adaption will be applied to reduce the complexity of the numerical models.