1.Key Laboratory of Mining of Education for Mine Disaster Prevention and Control,Shandong University of Science and Technology,Qingdao , China;2.College of Mining and Safety Engineering,Shandong University of Science and Technology,Qingdao ,China

为了研究煤炭地下气化覆岩在热固耦合条件下温度、应力以及塑性区分布演化规律,采用COMSOL软件在单向加热和轴向约束条件下对岩石进行了热固耦合数值模拟,得到了温度场、应力场、位移场以及体积应变和塑性区分布规律。结果表明:轴向不同位置温度随时间呈非线性增加,沿岩石高度方向温度梯度较大,且随时间呈降低趋势;主应力主要分布于岩石轴向下端面及附近圆周区,塑性区主要分布于试件下部1/6高度范围,存在扁平状孤岛塑性区;下端面圆周区出现应力拉伸,径向应变最大,模拟结果有助于从热固耦合的角度研究砂岩石的热损伤破裂特性。

In order to study the evolution laws of overburden temperature,stress and plastic zone distribution under thermal-mechanical coupling condition during underground coal gasification,the thermosetting coupling numerical simulation in the condition of uniaxial heating and axial constraint was carried out by COMSOL software,and the temperature field,stress field,displacement field,volume strain and plastic zone distribution law were obtained.The results show that the temperature increases nonlinearly with time at different axial positions;the temperature gradient is larger along the rock height direction and decreases with time;the main stress is mainly distributed in the lower end and the circle area of the rock axial direction;the plastic zone is mainly distributed at the lower end of sandstone accounting for 1/6 ratio,and existing flats islanding plastic zone;the stress of circumference lower end is tensile,and the radial strain has the maximum value.The simulation results are helpful to guide the thermal damage fracture characteristic of rock from the perspective of thermosetting coupling.

国家自然科学基金青年科学基金资助项目(51504142,51674157)；山东科技大学人才引进科研启动基金资助项目(2017RCJJ013)；山东科技大学矿业与安全工程学院一流学科建设专项资助项目(01AQ02105)；