Study on temperature influence law to vertical steel bar stress in external shaft liner of mine freezing shaft

In order to ensure a safety construction of the mine freezing shaft in Dahaize Mine,with the monitoring and measuring on the stress of the mine shaft liner,th e vertical steel bar stress of the mine shaft external liner and the transverse cross section temperature of the mine shaft liner were obtained. A linear regressive analysis W as conducted on the relationship between the vertical steel bar stress and temperature factors of the mine shaft external liner. The results showed that the vertical steel bar stress of the external liner varied with the liner temperature could be divided to six stages,the stress and temperature were in a negative relativity,the stress in the temperat ure limit reached the limit and the vertical steel bar in the external liner was in a safety status during the monitoring and measuring period. Under a obvious level of 0. 05,th e relevant coefficient between the vertical steel bar stress and the temperature was 0.921 6 ~ 0.969 9. After the concreting of the mine shaft liner completed,over 84. 78% of the vertical steel bar stress in the external liner would be released by the temperature stress and the temperature stress would be the main factor affected to the vertical steel bar stress in the external liner. Among them,the restricted temperature stress would be the main influence factor and the self temperature stress would be the second ary factor.