弹性与非线性状态下层状岩石高温热应力场数值对比分析

英文篇名：Numerical Comparison Analysis of Thermal Stress Field of Stratified Rock in Elastic or Non-linear States under High Temperature
中文刊名：矿业研究与开发
英文刊名：Mining Research and Development
作者：谭启
英文作者：TAN Qi(College of Civil and Industrial Engineering ; Anhui Xinhua University ; Hefei ; Anhui 230088 ; China)
中文关键词：煤炭地下气化 ; 温度应力场 ; 数值模拟 ; 最大等效热应力
英文关键词：Underground coal gasification ; Thermal stress field ; Numerical simulation ; maximal equivalent thermal stress
出版日期：2011-06-30
机构：安徽新华学院土木与工业工程学院;
年：2011
期：03
出版单位：矿业研究与开发

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。
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.

引文

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