Research On The Influence Of Frost Heave Of Frozen Soil To Derrick Footing In Freezing Sinking Shaft

In allusion to influence to structure made by frozen soil heave in artificial freezing construction, take deputy pit shaft's freezing method construction of Huai Nan Gu Bei mine as example, analyse function rule frost heave of frozen soil acts on derrick footing in freozen wall forming process. First through theoretical analysis, discusses the factor effecting the frost heave, as well as the frozen soil and structure interaction. And in this foundation, carries on field measurement to the derrick foundation, analyses varied rule of derrick footing's endogenic force, bottom pressure and vertical displacement in freeze wall forming process. Obtains through the actual analysis: because the derrick footing is the reinforced concrete independent foundation, it's rigidity is big, the influence of frozen soil heave's distortion to the foundation interior concrete strain and the steel bar endogenic force is small, but affects in a big way to the foundation bottom pressure and the vertical displacement. Using finite element software ADINA, considers the situation the surface temperature influences the freeze wall, carries the numerical analysis to the different time's distributed rule of freeze wall temperature field, and regards the frozen soil and the unfrozen soil as elastic-plastic material, uses the temperature field and the stress field coupling method, analyzes the different time's distributed rule of foundation bottom pressure and vertical displacement of derrick footing under the action made by the frozen soild heave distorts.Through carries the contrast analysis to the actual result and the numerical simulation, finally obtains the action rule the frost heave of frozen wall acts on the derrick footing. Through this topic research, we can initially understand the action rule the frost heave of frozen soild acts on the stucture in the frozen soild forming process. Thus it will have certain reference significance to reduce the influence of the artificial freezing mathod construction to the environment, as well as further promote the artificial freezing method.