岩石单向加热热固耦合数值模拟研究
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摘要
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.
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.
引文
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[29]张连英,茅献彪,卢爱红.高温作用下岩石力学性能的实验研究[J].中国科学:技术科学,2010,40(2):157-162.ZHANG Lianying,MAO Xianbiao,LU Aihong.Experimental study on the mechanical properties of rocks at high temperature[J].Science China Technological Sciences,2010,40(2):157-162.
[30]谭启.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[J].矿业研究与开发,2011,31(3):58-61.TAN Qi.Numerical comparison analysis of thermal stress field of stratified rock in elastic or non-linear states under high temperaure[J].Mining Research&Development,2011,31(3):58-61.
[2]余力.我国废弃煤炭资源的利用:推动煤炭地下气化技术发展[J].煤炭科学技术,2013,41(5):1-3.YU Li.Utilization of abandoned coal resources to promote the development of underground coal gasification technology in China[J].Coal Science and Technology,2013,41(5):1-3.
[3]余力,梁杰,余学东.煤炭资源开发与利用新方法:煤炭地下气化技术[J].科技导报,1999(4):33-35.YU Li,LIANG Jie,YU Xuedong.Progress in the coal underground pneumatolysis technology[J].Technology Review,1999(4):33-35.
[4]梁杰,余力.反向两阶段煤炭地下气化方法的研究[J].煤炭学报,1996,21(1):68-72.LIANG Jie,YU Li.Study of two-stage underground coal gasification in counter directions[J].Journal of China Coal Society,1996,21(1):68-72.
[5]朱铭,徐道一,孙文鹏,等.世界煤地下气化的快速发展[J].自然杂志,2012,34(3):161-166,180.ZHU Ming,XU Daoyi,SUN Wenpeng,et al.Rapid progress of underground coal gasification in the world[J].Chinese Journal of Nature,2012,34(3):161-166,180.
[6]辛林,王作棠,黄温钢,等.华亭煤炭地下气化产气与发电试验研究[J].煤炭科学技术,2013,41(5):28-34.XIN Lin,WANG Zuotang,HUANG Wengang,et al.Study on underground coal gasification production and power generation experiment in Huating Area[J].Coal Science and Technology,2013,41(5):28-34.
[7]梁杰,余力.“长通道、大断面”煤炭地下气化新工艺[J].中国煤炭,2002,28(12):10-12,15.LIANG Jie,YU Li.Underground coal gasification by the new technology of“long passage with large cross section”[J].China Coal,2002,28(12):10-12,15.
[8]杨兰和,潘霞,董贵明.焦煤地下气化模型试验研究[J].煤炭科学技术,2013,41(5):16-18,22.YANG Lanhe,PAN Xia,DONG Guiming.Study on model test of underground gasification of coking coal[J].Coal Science and Technology,2013,41(5):16-18,22.
[9]余力.两阶段煤炭地下气化工艺的应用[J].煤炭学报,2009,34(7):1008.YU Li.Application of two-stage underground coal gasification technology[J].Journal of China Coal Society,2009,34(7):1008.
[10]XIN Lin,WANG Zuotang,WANG Gang,et al.Technological aspects for underground coal gasification in steeply inclined thin coal seams at Zhongliangshan Coal Mine in China[J].Fuel,2017,191:486-494.
[11]YANG Lanhe,LIANG Jie,YU Li.Clean coal technology:study on the pilot project experiment of underground coal gasification[J].Energy,2003,28(14):1445-1460.
[12]YANG Lanhe,ZHANG Xing,LIU Suqin,et al.Field test of largescale hydrogen manufacturing from underground coal gasification(UCG)[J].International Journal of Hydrogen Energy,2008,33(4):1275-1285.
[13]庞旭林,潘霞,刘洪涛,等.贫瘦煤地下气化模型试验研究[J].煤炭科学技术,2011,39(5):120-124.PANG Xulin,PAN Xia,LIU Hongtao,et al.Experiment study on underground gasification model of lean coal[J].Coal Science and Technology,2011,39(5):120-124.
[14]杨兰和,刘淑琴,梁杰.煤炭地下气化动态温度场及浓度场数值分析[J].中国矿业大学学报,2003,32(4):349-353.YANG Lanhe,LIU Shuqin,LIANG Jie.Numerical analysis of dynamic temperature field and concentration field in the process of underground coal gasification[J].Journal of China University of Mining&Technology,2003,32(4):349-353.
[15]刘淑琴,陈峰,庞旭林,等.煤炭地下气化反应过程分析及稳定控制工艺[J].煤炭科学技术,2015,43(1):125-128,129.LIU Shuqin,CHEN Feng,PANG Xulin,et al.Analysis on reaction process of underground coal gasification and stable control technique[J].Coal Science and Technology,2015,43(1):125-128,129.
[16]刘淑琴,张军,梁杰,等.煤炭地下气化的综合利用前景[J].煤炭科学技术,2003,31(7):50-53.LIU Shuqin,ZHANG Jun,LIANG Jie,et al.Outlook on comprehensive utilization of underground coal gasification[J].Coal Science and Technology,2003,31(7):50-53.
[17]刘淑琴,张尚军,牛茂斐,等.煤炭地下气化技术及其应用前景[J].地学前缘,2016,23(3):97-102.LIU Shuqin,ZHANG Shangjun,NIU Maofei,et al.Technology process and application prospect of underground coal gasification[J].Earth Science Frontiers,2016,23(3):97-102.
[18]WANG Zuotang,DING Xueping,HUO Liwen,et al.A remining technology of underground coal gasification at Zhongliangshan Coal Mine[J].Journal of Coal Science and Engineering(China),2008,14(3):469-473.
[19]CHANDELLE V,JACQUEMIN C,LTOLLE R,et al.Underground coal gasification on the thulin site:results of analysis from post-burn drillings[J].Fuel,1993,72(7):949-963.
[20]辛林,程卫民,王刚,等.煤炭地下气化多层热弹性基础梁模型及其应用[J].岩石力学与工程学报,2016,35(6):1233-1244.XIN Lin,CHENG Weimin,WANG Gang,et al.Multi-layer thermo-elastic foundation beam model of UCG and its application[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(6):1233-1244.
[21]赵阳升,万志军,张渊,等.岩石热破裂与渗透性相关规律的试验研究[J].岩石力学与工程学报,2010,29(10):1970-1976.ZHAO Yangsheng,WAN Zhijun,ZHANG Yuan,et al.Experimental study of related laws of rock thermal cracking and permeability[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(10):1970-1976.
[22]武晋文,赵阳升,万志军,等.高温均匀压力花岗岩热破裂声发射特性实验研究[J].煤炭学报,2012,37(7):1111-1117.WU Jinwen,ZHAO Yangsheng,WAN Zhijun,et al.Experimental study of acoustic emission of granite due to thermal cracking under high temperature and isostatic stress[J].Journal of China Coal Society,2012,37(7):1111-1117.
[23]武晋文,赵阳升,万志军,等.中高温三轴应力下鲁灰花岗岩热破裂声发射特征的试验研究[J].岩土力学,2009,30(11):3331-3336.WU Jinwen,ZHAO Yangsheng,WAN Zhijun,et al.Experimental study of acoustic emission charactristics of granite thermal cracking under middle-high temperature and triaxial stress[J].Rock and Soil Mechanics,2009,30(11):3331-3336.
[24]张宁,赵阳升,万志军,等.三维应力下热破裂对花岗岩渗流规律影响的试验研究[J].岩石力学与工程学报,2010,29(1):118-123.ZHANG Ning,ZHAO Yangshegn,WAN Zhijun,et al.Experimental research on seepage laws of granite under thermal cracking action with 3D stress[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(1):118-123.
[25]康志勤,赵阳升,杨栋.油页岩热破裂规律分形理论研究[J].岩石力学与工程学报,2010,29(1):90-96.KANG Zhiqin,ZHAO Yangsheng,YANG Dong.Theoretical research on thermal cracking fractals laws of oil shale[J].Chinese Journal of Rock Mechanics and Engineering,2010,29(1):90-96.
[26]万志军.非均质岩体热力耦合作用及煤炭地下气化通道稳定性研究[D].徐州:中国矿业大学,2006.
[27]陆银龙,王连国,唐芙蓉,等.煤炭地下气化过程中温度-应力耦合作用下燃空区覆岩裂隙演化规律[J].煤炭学报,2012,37(8):1292-1298.LU Yinlong,WANG Lianguo,TANG Furong,et al.Fracture evolution of overlying strata over combustion cavity under thermal-mechanical interaction during underground coal gasification[J].Journal of China Coal Society,2012,37(8):1292-1298.
[28]王洪纲.热弹性力学概论[M].北京:清华大学出版社,1989.
[29]张连英,茅献彪,卢爱红.高温作用下岩石力学性能的实验研究[J].中国科学:技术科学,2010,40(2):157-162.ZHANG Lianying,MAO Xianbiao,LU Aihong.Experimental study on the mechanical properties of rocks at high temperature[J].Science China Technological Sciences,2010,40(2):157-162.
[30]谭启.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[J].矿业研究与开发,2011,31(3):58-61.TAN Qi.Numerical comparison analysis of thermal stress field of stratified rock in elastic or non-linear states under high temperaure[J].Mining Research&Development,2011,31(3):58-61.