多场耦合作用下砂岩渗透率演化规律
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摘要
在不同温度和孔隙水压条件下,研究砂岩三轴压缩过程中渗透特性的演化规律,研究多场耦合作用下岩石渗透率与力学性质的演化规律,结合CT技术从细观角度进行验证温度和水对裂隙损伤演化的影响。研究结果表明:渗透率随着岩样的变形而变化,其变化趋势与岩样受载变形破坏的发展阶段相对应。三轴压缩状态下,渗透率对轴向力和径向变形密切相关。温度的作用降低了峰值强度、残余强度和切线模量,增大了泊松比。孔隙水压和温度的作用增大了岩体塑性,损伤减小。由于孔隙水压的增大使得有效应力减小,水楔作用、润滑作用和软化作用的存在,相同温度条件下,峰值强度、残余强度和切线模量随之减小,泊松比增大。孔隙水压的提高造成了更大的渗透率。温度的升高导致渗透率降低。
The permeability of sandstone was studied under triaxial compression subjected to different temperatures and pore pressures. The evolution of rock permeability and mechanical properties under multi-field coupling was discussed and effects of temperature and water on fracture evolution were studied with CT technology. The results show that the permeability changes with deformation. The change in permeability was tightly related with the damage deformation process of rock, as well as axial stress and radial strain. Increasing temperature reduced the peak strength, residual strength and tangent modulus, but increased Poisson's ratio. Pore water pressure and temperature increased the plasticity of rock to reduce damage. Peak strength, residual strength and tangent modulus decreased, while Poisson's ratio increased due to less effective stress caused by pore pressure and effects of water wedge, lubrication, softening. The larger pore pressure causes the larger permeability. An increase in temperature resulted in less permeability.
The permeability of sandstone was studied under triaxial compression subjected to different temperatures and pore pressures. The evolution of rock permeability and mechanical properties under multi-field coupling was discussed and effects of temperature and water on fracture evolution were studied with CT technology. The results show that the permeability changes with deformation. The change in permeability was tightly related with the damage deformation process of rock, as well as axial stress and radial strain. Increasing temperature reduced the peak strength, residual strength and tangent modulus, but increased Poisson's ratio. Pore water pressure and temperature increased the plasticity of rock to reduce damage. Peak strength, residual strength and tangent modulus decreased, while Poisson's ratio increased due to less effective stress caused by pore pressure and effects of water wedge, lubrication, softening. The larger pore pressure causes the larger permeability. An increase in temperature resulted in less permeability.
引文
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[2]蒋凌志,顾家裕,郭彬程.中国含油气盆地碎屑岩低渗透储层的特征及形成机制[J].沉积学报,2004,22(1):13-18.JIANG Lingzhi,GU Jiayu,GUO Bincheng.Characteristics and mechanism of low permeability clastic reservoir in Chinese petroliferous basin[J].Acta Sedimentologica Sinica,2004,22(1):13-18.
[3]何满潮,景海河,孙晓明.软岩工程力学[M].北京:科学出版社,2002.HE Manchao,JING Haihe,SUN Xiaoming.Engineering mechanics of soft rock[M].Beijing:Science Press,2002.
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[5]尹立明,郭惟嘉,陈军涛.岩石应力-渗流耦合真三轴试验系统的研制与应用[J].岩石力学与工程学报,2014,33(S1):2820-2826.YIN Liming,GUO Weijia,CHEN Juntao.Development of true triaxial rock test system of coupled stress-seepage and its application[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(S1):2820-2826.
[6]蒋宇静,李博,王刚,等.岩石裂隙渗流特性试验研究的新进展[J].岩石力学与工程学报,2008,27(12):2377-2386.JIANG Yujing,LI Bo,WANG Gang,et al.New advances in experimental study on seepage characteristics of rock fractures[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(12):2377-2386.
[7]陈波,李宁,禚瑞花.多孔介质的变形场-渗流场-温度场耦合有限元分析[J].岩石力学与工程学报,2001,20(4):467-472.CHEN Bo,LI Ning,ZHUO Ruihua.Finite element analysis on fully coupled thermo-hydro-mechanic behavior of porous media[J].Chinese Journal of Rock Mechanics and Engineering,2001,20(4):467-472.
[8]许江,陶云奇,尹光志,等.含瓦斯煤THM耦合模型及实验研究[M].北京:科学出版社,2012:20-45.XU Jiang,TAO Yunqi,YIN Guangzhi,et al.Gassy coal THM coupling model and experimental study[M].Beijing:Science Press,2012:20-45.
[9]许江,张丹丹,彭守建,等.三轴应力条件下温度对原煤渗流特性影响的实验研究[J].岩石力学与工程学报,2011,30(9):1848-1854.XU Jiang,ZHANG Dandan,PENG Shoujian,et al.Experimental research on impact of temperature on seepage characteristics of coal containing methane under triaxial stress[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(9):1848-1854.
[10]YIN G Z,JIANG C B,WANG J G,et al.Combined effect of stress,pore pressure and temperature on methane permeability in anthracite coal:an experimental study[J].Transport in Porous Media,2013,100(1):1-16.
[11]贺玉龙,杨立中.温度和有效应力对砂岩渗透率的影响机理研究[J].岩石力学与工程学报,2005,24(14):2420-2427.HE Yulong,YANG Lizhong.Mechanism of effects of temperature and effective stress on permeability of sanstone[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(14):2420-2427.
[12]徐增辉,刘光廷,叶源新,等.温度对软岩渗透系数影响[J].三峡大学学报,2008,28(4):301-304.XU Zenghui,LIU Guangting,YE Yuanxin,et al.Research on effect of temperature on permeability of soft rock[J].Journal of China Three Gorges University,2008,28(4):301-304.
[13]陈益峰,胡冉,周创兵,等.热-水-力耦合作用下结晶岩渗透特性演化模型[J].岩石力学与工程学报,2013,32(11):2185-2195.CHEN Yifeng,HU Ran,ZHOU Chuangbing,et al.A permeability evolution model for crystalline rocks subjected to coupled thermo-hydro-mechanical loading[J].Chinese Journal of Rock Mechanics and Engineering,2013,V32(11):2185-2195
[14]张玉军.遍有节理岩体的双重孔隙介质热-水-应力耦合模型及其有限元分析[J].岩石力学与工程学报,2009,28(5):947-955.ZHANG Yujun.Coupled thermo-hydro-mechanical model and finite element analyses of dual-porosity fractured medium for ubiquitous-joint rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(5):947-955.
[15]张玉军,张维庆.裂隙开度的压力溶解对双重孔隙介质热-水-应力耦合影响的有限元分析[J].岩土力学,2010,31(4):1269-1275.ZHANG Yujun,ZHANG Weiqing.Finite element analysis of influence of pressure solution of fracture aperture on T-H-M coupling in dual-porosity medium[J].Rock and Soil Mechanics,2010,31(4):1269-1275.
[16]张玉军,张维庆.裂隙贯通率对双重孔隙介质热-水-应力耦合现象影响的有限元分析[J].岩石力学与工程学报,2011,32(12):3743-3750.ZHANG Yujun,ZHANG Weiqing.Coupled thermo-hydromechanical model and finite element analyses of dual-porosity fractured medium for ubiquitous-joint rock mass[J].Chinese Journal of Rock Mechanics and Engineering,2011,32(12):3743-3750.
[17]赵延林,曹平,赵阳升,等.双重介质温度场-渗流场-应力场耦合模型及三维数值研究[J].岩石力学与工程学报,2007,26(增刊2):4024-4031.ZHAO Yanlin,CAO Ping,ZHAO Yangsheng,et al.Dual media model for thermo-hydro-mechanical coupling and 3D numerical simulation[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(S2):4024-4031.
[18]于永江,张华,张春会,等.温度及应力对成型煤样渗透性的影响[J].煤炭学报,2013,38(6):936-941.YU Yongjiang,ZHANG Hua,ZHANG Chunhui,et al.Effects of temperature and stress on permeability of standard coal briquette specimen[J].Journal of China Coal Society,2013,38(6):936-941.
[19]RETQVIST J,WU Y S,TSANG C F,et al.A modeling approach for analysis of coupled multiphase fluid flow,heat transfer,and deformation in fractured porous rock[J].International Journal of Rock Mechanics and Mining Sciences,2002,39(4):429-442.
[20]SOMERTON W H,GUPTA V S.Role of fluxing agents in thermal alteration of sandstone[J].Journal of Petroleum Technology,1965,17(5):585-588.
[21]KEMENY J,ZOMENI Z.A comparison of eight methods for measuring grain and boundary cracking in heated quartzite samples[J].International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts,1998,35(4):506-507.
[22]KO?U?NíKOV A,KONE?NYP.Influence of temperature on the permeability of rocks[J].Géotechnique,2011,61(12):1081-1085.
[23]ROSTOVANYI PORTA M.Thermo-Hydro-Mechanical analysis of a Callovo-Oxfordian clay[D].Barcelona:Universitat Politècnica de Catalunya.School of Civil Engineering,2013.
[24]ALAM A K M B,FUJII Y,FUKUDA D,et al.Fractured rock permeability as a function of temperature and confining pressure[J].Pure and Applied Geophysics,2015:1-19.
[25]陈宇龙,魏作安,张千贵.等幅循环加载与分级循环加载下砂岩声发射Felicity效应试验研究[J].煤炭学报,2012,37(2):226-230.CHEN Yulong,WEI Zuoan,ZHANG Qiangui.Experimental study on Felicity effect of acoustic emission in rock under cyclic loading and tiered cyclic loading[J].Journal of China Coal Society,2012,37(2):226-230.
[26]陈宇龙,魏作安,许江,等.单轴压缩条件下岩石声发射特性的实验研究[J].煤炭学报,2011,36(增2):237-240.CHEN Yulong,WEI Zuoan,XU Jiang,et al.Experimental research on the acoustic emission characteristics of rock under uniaxial compression[J].Journal of China Coal Society,2011,36(Supp.2):237-240.
[27]张玉,徐卫亚,邵建富,等.渗流-应力耦合作用下碎屑岩流变特性和渗透演化机制试验研究[J].岩石力学与工程学报,2014,33(8):1679-1690.ZHANG Yu,XU Weiya,SHAO Jianfu,et al.Experimental investigation on rheological properties and permeability of clastic rock under hydro-mechanical coupling[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(8):1679-1690.
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