关键词: 纵向膨胀, 温度作用, 土体与井壁相互作用, 弹塑性剪切模型, 温度竖向附加应力

Abstract: The shaft lining rupture in deep topsoil is a geological disaster，which seriously harm the coal mine production.Temperature action is an important factor that results in the increasing of vertical wellbore stress and induces the fracture of the shaft lining.In order to analyze the temperature effect of longitudinal expansion on shaft lining in deep alluvium，on the basis of analyzing the interaction between shaft lining and soil，the el-plastic shearing model of the soil and soil shearing was built according to thermodynamics and elastic theory，and the calculation formula of temperature vertical additional stress is induced.Further analysis shows that the temperature vertical additional stress in shaft lining increases with depth continuously，and reached the maximum value near the bedrock.The temperature vertical additional stress displays as an approximate linear increase with the depth of el-plastic shear section cut-off point.These findings contributes to deepening the understanding on the mechanism of shaft lining rupture in deep topsoil，and provides the theoretical basis for the prevention and governance of shaft lining fracture accident.

Key words: Longitudinal expansion, Temperature action, Interaction between shaft lining and soil mass, El-plastic shearing model, Temperature vertical additional stress