Viscoelastic Plasticity Constitutive Model Research And Application Of Artificial Frozen Soil

Artificial freezing method has been applied in the early1960s to the mine construction. Central area coal seam buried deep, deep topsoil by freezing method sinking technology, its key is to ensure the safety and stability of frozen wall. The design of frozen wall in frozen soil mechanics、parameter selection of security, stability and economy have important significance.Construction of freezing method, the frozen wall as temporary support structure of the wall in the shaft excavation process, in the process of construction due to the time effect, freezing wall should be taken into account as a flow variation, as a temporary structure, in construction process, if the deformation of the frozen wall is too big could bring a lot of problems to the wellbore construction, but also may lead to freezing pipe fracture of engineering accidents. To control the deformation of frozen wall in the construction process of freezing engineering and wellbore construction has important significance.Taking Guqiao north ore in Huainan during freezing shaft construction for the engineering background, through the Anhui university of science and technology developed by frozen soil uniaxial, triaxial testing machine on the creep properties of deep frozen clay were studied, and obtained the different negative temperature under the condition of artificially frozen clay creep characteristics and the law. West source model is verified by experiment in simulated in artificial creep properties of frozen clay has a good applicability, especially in the triaxial unloading creep of frozen clay under the condition of study, improve the west source model to creep simulation of artificial frozen clay is very accurate. Through scaled numerical simulation ADINA, The shaft excavation, get well for displacement and displacement of floor drum up face of analog values, by comparing the measured data, the scaled simulation software ADINA. The deep freezing method sinking frozen wall forming process and frozen wall mechanical characteristics calculation is feasible. Also show that the numerical simulation can fully reflect all the displacement of the frozen wall features, including advance displacement of frozen wall and internal displacement of the frozen wall. And field test, due to special circumstances, such as engineering conditions for only a small part of the energy to the actual displacement measurement Visible, using numerical simulation method can be more comprehensive mastery of the mechanical properties of frozen wall.