边坡岩体浅层破坏的热应力效应研究

STUDY ON THE THERMAL STRESS EFFECT ON LARGE FAILURE OF SHALLOW OF SLOPE ROCKMASS

温度变化是影响边坡岩体风化并导致浅层破坏的一个重要因素。边坡岩体内的温度变化比较复杂，且随地面温度的变化呈周期性的变化。温度的变化导致热应力的生成，温度变化的周期性致使热应力具有交变性。在这种交变应力作用下，边坡浅部岩体的破坏表现出疲劳特征。本文分析了边坡岩体中的温度场和热应力的分布特征以及边坡岩体疲劳破坏的机理及判据。

Variation in geotemperature is one of the most important factors affecting the weathering process and the failure of shallow large of slope rockmass, the geotemperature field, which varies with the weather, is characterized by cyclic variation. Moreover, the thermal stress, was an alternative stress caused by geotemperature variation, can lead the fatigue failure of rockmass. In this paper, the distribution of geotemperature field and the thermal stress are analysed, the mechanism and criterion of fatigue failure are also discussed.