The field measurement and analysis of freezing shaft lining pressure in special stratum of Inner Mongolia area

Through the filed monitoring of freezing shaft lining pressure of the Bojiang-Haizi coal mine wind well in Inner Mongolia Cretaceous and Jurassic strata, four stages of freezing shaft lining pressure development were obtained, and the pressure caused by freezing construction method in Cretaceous stratum were larger than pressure in Jurassic. However, pressure in these two strata were small, less than 2MPa, and the pressure was beneficial to the shaft lining structural safety. It showed that freezing method was suitable for Inner Mongolia area Cretaceous and Jurassic strata, and provided the basis for the design and construction of freezing shaft lining in this area.