| With the rapid economic development and the increase in coal demand, mine construction develops to deep well direction step by step. However, due to the insufficient depth of deep soil mechanics,the Construction and design of freezing method for shaft sinking are still many problems to be solved.And in recent years faced the freezing of the whole rock shaft , our country are more defective in theoretical research and practical experience of the frozen rock. Launching theoretical research on freezing method for soft slate shaft has some guidance on the actual project.This paper takes the Hu Jia river coal mine vertical shaft freezing project in Shanxi BingChang mining area as a background,on the basis of the representative test results of mechanical properties of frozen sandstone in the Hu Jia river coal mine area,we get test data about temperature,Formation conditions,Moisture content and Lithology.By the research on physical and mechanical properties of deep and thick frezon rock,getting physical-mechanical propertiesphysical-mechanical parameter of soft rocks with different freezing temperature and different confining pressure.The article does analysis of the traditional calculation of the freeze well and discusses the applicability and limitations of the various formulas. Using Hu Jia river coal mine project we gets analytical solution by theoretical calculation for the frozen wall thickness. At last, considering the characteristics of freezing temperature and the stress field about the deep forzen wall with high pressure, taking into account of the actual loads of the frozen wall, the author analyse the Hu Jia river coal mine thickness of soft rock frozen wall by numerical simulation.And comparing the thickness of forzen wall results by numerical simulation and formula. Thinking the effect of freezing temperature to frozen wall thickness deep and driving height of frozen rock,we determine a reasonable driving height of frozen rock and make sure the reasonable range of freezing temperature by way of Numerical Computation.And we also does analysis frozen wall that calculated by intensity and deformation is reasonable by numerical calculation.This paper systematically study the mechanical properties of freezing- soft rock,theoretical calculation for the frozen wall thickness and the factors of the frozen wall thickness.It provids a theory evidence to the optimal design, construction and thickness of frozen wall and has a great significance . |
