【摘要】 在考虑层状岩石热力学参数随温度变化以及温度作用下岩石的热弹塑性本构方程的基础下,利用有限元软件ANSYS对煤炭地下气化高温作用下煤层顶底板的温度场和应力场进行了研究,对比了弹性状态和弹塑性状态下的岩石的应力场分布情况。通过对比分析发现,当温度达到300℃以上时,线弹性状态与弹塑性状态下得到热应力之间的误差为30%,1000℃以上误差接近100%。这充分说明在高温情况下不能忽略岩石的非线性特性,否则温度的升高会使地下工程中岩石计算应力与实际情况产生很大差异。更多还原

【Abstract】 Considering the variation of thermodynamic parameters of stratified rock with variation of temperature and its thermo-elastic-plastic constitutive equation,the finite element analysis software ANSYS was used to study the temperature field and stress field in coal seam roof and floor under high temperature caused by underground coal gasification.The stress fields in the stratified rock under elastic state and elastic-plastic state were compared.By comparative analysis,it was found that,the deviation of the stress fields in the two states was 30%when the temperature reached 300℃ over,the deviation approached 100%when the temperature reached 1000℃ over.This showed that the nonlinear character of rock under high temperature is not to be ignored,otherwise the calculated result of rock stress is quite different from actual situation because of a rise in temperature.更多还原