Numerical simulation on shaft lining stresses analysis of operating mine with seasonal temperature change

摘要

Based on monitored axial strain data of a double-layer shaft lining, space axial-symmetrical FEM model of the shaft lining was built by ABAQUS to simulate its strain and stress developing laws in 2 years (start at summer). The model considers 4 main kinds of external forces acting on shaft lining, i.e. its self-weight, horizontal ground pressure, vertical additional force, as well as thermal stress. Both the monitored and simulated axial strain developing law wave as temperature changing law, but accumulate on its value. With the combined effects of periodicity changed thermal stress and accumulating vertical additional force, equivalent stress of outside lining gradually exceeds that of inside lining, reaching the maximum value at winter with thermal stress weight factor of 6%. The thermal stress would certainly exacerbate the rupture of shaft lining, so thermal stress must be considered when designing a shaft lining structure.