Abstract:

 In order to study the stress state of shaft lining affected by seasonal temperature variation during shaft operation, the elastic mechanics and heat conduction principles are applied in the analysis of shaft lining and surrounding rocks. The contact surface problems are considered to establish the mechanical model by analyzing the temperature and stress fields of shaft lining and the surrounding rocks. The derived formula shows that the temperature fields of the shaft lining and surrounding rocks changes periodically with the temperature of the airflow in the shaft during the operation of the shaft. The temperature field of the shaft lining and surrounding rocks always presents uneven distribution. With the increase of radial distance in the surrounding rocks, the influence of temperature gradually disappears. The total tangential and circumferential stresses of shaft lining change periodically with the air flow temperature during the operation of shaft. The maximum circumferential stress occurs at the inner edge of the shaft lining, and the total radial stress is minimized. The horizontal stress at the far field has a great influence on the total stress of shaft lining during its operation. The temperature change of surrounding rocks is an important factor affecting the stress state of shaft lining. The shaft lining is usually in a compressive stress state during the ventilation period. In the design of shaft lining, the stress differencewith the maximum temperature of the inner edge of shaft lining changes, considering the early and medium-term stresses of shaft lining temperature stress, should be taken as the reference minimum value for selecting the strength of shaft lining concrete. 

Key words: mine shaft construction, temperature stress, contact surface problem, shaft lining design