Study On Emerging Water Mechanism Of Deeply Freeze's Sidewall Under Coupled Thermal-Hydrological-Mechanical Processes

Along with continuously develop of coal resource, the topsoil alluvium through by shaft while constructs new coal mine becomes more and more thick. Such as the will soon develop and construct mine that Wanfu mine of Shangdong Juye coalfield, Guoxi coalfield of Anhui huaibei, Yangchun coal mine of Xinji group and Kouzixi mine etc, which through the topsoil alluvium will as thick as 600～800 meters. When adopt freeze sinking, the concrete of shaft will produce leaking water phenomenon after the frozen wall thawed, it bring pitfall to mine's safety in production. For this, this paper carried on the research of gushing leakage mechanism analysis of deeply freezing shaft wall under temperature-stress-hydraulic coupling process. The results showed that, concrete damage constant increasing and bearing capacity decreased significantly in shaft lining under the direct effect of high-pressure water load.First, it proposed influencing factors of concrete's temperature stress according to the calculation principle of unsteady temperature field, it also given mathematics expression of concrete structure's temperature field and temperature stress with inner heat source according to basic principle of finite element method. It analyzed the change process of the concrete temperature and influencing factors of the temperature stress, given the finite element equation under coupled thermo-mechanical's effect. It has studied the mechanism and given the criterion of concrete's hydraulic fracturing, proposed the main impact factor on the study of reason that gushing leakage of deeply freezing shaft wall under the effect of high-pressure water after thawing out of the frozen wall. According to the principles of similarity theory, it obtained the test similarity criterion of shaft lining model and carried on model design while adopt equation analysis and carried through experiment analysis with reinforced concrete's shaft wall under direct action of water ballasting, with contrast of experimental result which add waterproof layer to reinforced concrete. In the paper, the research results can supply gushing leakage technical difficulty of deeply freezing shaft wall with reference.