During digging and building in ectotheca of freezing section,North Air Shaft of the Chen Si Lou Coal mines,thorough organization and the possible arrangement, it has realized the central rotation and the coordinating the gangue by excavator, implemented the system of rolling grades and the specializing teams and groups combined, raised the tunneling speed,guaranteed the project quality.

After thawing out of the frozen wall,Guqiao Auxiliary Shaft is grouted and blocking water,pouring water is restricted in the allowable range,whic can provide a successful references to the mine construction of similar stratum.

Finite element analysis of temperature field features in frozen wall of longgu well;

The effects of groundwater flow on the formation of frozen wall and the establishment of mathematical model;

Elastic and plastic model for calculattion of frozen wall stress and displacement field;

Based on the in-situ measurement of temperature during freezing sinking,the influence of the temperature field of ice wall on that of outer shaft wall was studied.

According to the displacement features of ice wall a composite trigonometric function is used to approximate the deflection curve of freeze pipe to get the distribution of inner forces on freeze pipe.