Research On The Interaction Between Frozen Wall And Shaft Lining Of Xinzhuang Coal Mine Air Shaft

With the implementation of the grand development plan of western china, a new roundupsurge of shaft building has been developing in the western region where many new minesare through the thickness of cretaceous strata. Due to lacking of study on the freezing rock inthis ground and corresponding design and construction experience, So it is necessary to carryout engineering test and study on the relevant design theory of freezing of this kind ofspecial strata in western area.Xinzhuang coal mine air shaft freezing sinking project in Gansu province is the rare deepbedrock freezing engineering and representative, which the total freezing depth is910m andthrough653.88m cretaceous. This paper is based on the Xinzhuang coal mine air shaftfreezing sinking engineering. Physical and mechanical parameters under different temperatureand its variation law with temperature of the cretaceous saturated rock are obtained throughthe indoor experiment, and which is compared with the surface soil layer. The calculationformula of freezing pressure caused by the initial in-situ stress and the and the displacementformula of frozen wall which is under the unloading condition in the radial direction isobtained through the elastic-plastic analysis of the frozen wall, the outer wall and thesurrounding rock. The temperature field of frozen wall and shaft lining was analyzed byUsing ANSYS finite element simulation software, the different temperature of castingconcrete and pouring time influence on the "two wall" temperature field was simulated.Through the actual measurement of Xinzhuang coal mine air shaft of-632m and-841mformations of Cretaceous strata, collection and analysis of the measured data, the temperaturefield change rule and the development of the freeze pressure variation law of the outer walland its internal ring and vertical reinforcement stress change rule of the two monitoringcretaceous horizontal freezing wall and wall affected by heat of hydration of concrete isobtained. And the measured data, the analytical solution and the numerical simulation results were compared to verify.This paper research on the interaction between frozen wall and shaft lining of Xinzhuangcoal mine air Shaft through the methods of combining theoretical analysis, numericalsimulation and field measurement. It has a certain guiding significance to the optimizationdesign and specification construction of the frozen wall and Shaft Lining of the Freezingmethod in the Cretaceous strata of this region.