(1. College of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Key Laboratory of
In-situ Modified Mining of Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China)
Abstract：In deep geothermal reservoirs，a multitude of sealed rock fractures are prevalent. Utilizing hydraulic stimulation to induce shear along these fractures can significantly enhance the permeability and convective heat transfer performance of geothermal reservoirs. To investigate this mechanism，a series of shear tests were conducted on granite fractures at different temperatures(25 ℃ to 300 ℃)，and the evolution of permeability and convective heat transfer coefficient during the shear were measured concurrently. Through quantitatively characterizing the changes in surface morphology and the damage to surface asperities caused by shear slip，the mechanism of high temperature and shear induced damage effects on the permeability and heat transfer characteristics of fractured granite was revealed. The results show that：(1) the permeability and convective heat transfer coefficient of granite during shear slip exhibit three stages，which are closely related to shear-induced changes such as shrinkage，dilatancy，asperity damage，and gouge production；(2) The permeability K1 in the stable stage exhibits minimal correlation with temperature. However，as the temperature increases from 25 ℃ to 300 ℃，the rate of permeability increase during the growth stage gradually decreases from 159.75 to 30.58，and during the attenuation stage，it decreases from 148.68 to 3.03. (3) There is a positive correlation between the convective heat transfer coefficient and permeability. Higher temperatures in granite are associated with higher convective heat transfer coefficients. (4) Higer temperatures exacerbate shear damage to surface asperities. As the temperature increases from 25 ℃ to 300 ℃，the damage volume increases from 508.1 mm3 to 729.3 mm3. The production of smaller particles from shearing contributes to the enhanced attenuation effect of gouge blockage on permeability and convective heat transfer coefficients during shear slip. This research provides valuable insights for the efficient extraction of heat energy from dry hot rocks.
廖 涛1，2，陈跃都2，梁卫国1，2，李智凌1，2，张嘉芯1，2. 高温及动态剪切下花岗岩裂隙渗流与传热特性试验研究[J]. 岩石力学与工程学报, 2024, 43(9): 2273-2288.
LIAO Tao1，2，CHEN Yuedu2，LIANG Weiguo1，2，LI Zhiling1，2，ZHANG Jiaxin1，2. Experimental study on seepage and heat transfer characteristics evolution of fractured granite induced by dynamic shear slip at high temperature. , 2024, 43(9): 2273-2288.
[1] 许天福，袁益龙，姜振蛟，等. 干热岩资源和增强型地热工程：国际经验和我国展望[J]. 吉林大学学报：地球科学版，2016，46(4)：1 139–1 152.(XU Tianfu，YUAN Yilong，JIANG Zhenjiao，et al. Hot dry rock and enhanced geothermal engineering：International experience and china prospect[J]. Journal of Jilin University：Earth Science，2016，46(4)：1 139–1 152.(in Chinese))
[2] POTTER R，ROBINSON E，SMITH M. Method of extracting heat from dry geothermal reservoirs[P]. USA：US Patent No. 3786858，1974.
[3] 张洪伟，万志军，赵毅鑫，等. 深层地热储层水力剪切增透机制研究进展[J]. 煤炭学报，2021，46(10)：3 172–3 185.(ZHANG Hongwei，WAN Zhijun，ZHAO Yixin，et al. A review of the research on the mechanism of hydro-shearing in geothermal reservoir[J]. Journal of China Coal Society，2021，46(10)：3 172–3 185.(in Chinese))
[4] 多 吉. 典型高温地热系统——羊八井热田基本特征[J]. 中国工程科学，2003，5(1)：42–47.(DUO Ji. The basic characteristics of the Yangbajing geothermal field：A typical high temperature geothermal system[J]. Engineering Science，2003，5(1)：42–47.(in Chinese))
[5] CLADOUHOS T，PETTY S，LARSON B，et al. Toward more efficient heat mining：a planned enhanced geothermal system demonstration project[J]. GRC Transactions，2009，33：165–170.
[6] CHEN Y，ZHANG C，ZHAO Z，et al. Shear behavior of artificial and natural granite fractures after heating and water-cooling treatment[J]. Rock Mechanics and Rock Engineering，2020，53(12)：5 429–5 449.
[7] LI R，DUSSEAULT M B. Shale gas geomechanics and insights into hydraulic fracturing stimulation[C]// Fifth EAGE Shale Workshop. [s. l.]：[s. n.]，2016：1–5.
[8] ESAKI T，DU S，MITANI Y，et al. Development of a shear-flow test apparatus and determination of coupled properties for a single rock joint[J]. International Journal of Rock Mechanics and Mining Sciences，1999，36(5)：641–650.
[9] LEE H S，CHO T F. Hydraulic characteristics of rough fractures in linear flow under normal and shear load[J]. Rock Mechanics and Rock Engineering，2002，35(4)：299–318.
[10] 张 强，李小春，胡少斌，等. 高应力下花岗岩耦合节理在剪切过程中渗透率演化特性[J]. 岩土力学，2018，39(10)：3 641–3 650. (ZHANG Qiang，LI Xiaochun，HU Shaobin，et al. Permeability evolution of coupling granite joint during shearing under high stress condition[J]. Rock and Soil Mechanics，2018，39(10)：3 641–3 650.(in Chinese))
[11] FANG Y，ELSWORTH D，WANG C，et al. Frictional stability-permeability relationships for fractures in shales[J]. Journal of Geophysical Research：Solid Earth，2017，122(3)：1 760–1 776.
[12] 陈跃都. 水力耦合作用下岩体粗糙裂隙渗流及滑移失稳机制研究[博士学位论文][D]. 太原：太原理工大学，2018.(CHEN Yuedu. Study on flow and slip instability mechanism in rough rock fractures under hydro-mechanical coupling effects[Ph. D. Thesis][D]. Taiyuan：Taiyuan University of Technology，2018.(in Chinese))
[13] 蒋宇静，王 刚，李 博，等. 岩石节理剪切渗流耦合试验及分析[J]. 岩石力学与工程学报，2007，26(11)：2 253–2 259.(JIANG Yujing，WANG Gang，LI Bo，et al. Experimental study and analysis of shear-flow coupling behaviors of rock joints[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(11)：2 253–2 259.(in Chinese))
[14] 夏才初，钱 鑫，桂 洋，等. 多功能岩石节理全剪切–渗流耦合试验系统研制与应用[J]. 岩石力学与工程学报，2018，37(10)：2 219–2 231.(XIA Caichu，QIAN Xin，GUI Yang，et al. A novel multifunctional shear-flow coupled test system for rock joints and its application[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(10)：2 219–2 231.(in Chinese))
[15] 陈奕安，许 江，彭守建，等. 可视化三轴渗流–应力耦合伺服控制试验系统的研制与应用[J]. 岩石力学与工程学报，2023，42(增1)：3 281–3 292.(CHEN Yian，XU Jiang，PENG Shoujian，et al. Development and application of transparent triaxial seepage-stress coupling servo-control test system[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(Supp.1)：3 281–3 292.(in Chinese))
[16] 陈卫忠，隋 群，王鲁瑀，等. 岩石节理面应力–渗流耦合剪切流变试验系统的研制与应用[J]. 岩石力学与工程学报，2021，40(9)：1 729–1 738.(CHEN Weizhong，SUI Qun，WANG Luyu，et al. Development and application of a hydro-mechanical coupling stress creep test machine for rock joints[J]. Chinese Journal of Rock Mechanics and Engineering，2021，40(9)：1 729–1 738.(in Chinese))
[17] PRAMUDYO E，GOTO R，SAKAGUCHI K，et al. CO2 Injection-induced shearing and fracturing in naturally fractured conventional and superhot geothermal environments[J]. Rock mechanics and Rock Engineering，2023，56：1 663–1 677.
[18] BAUER S J，HUANG K，CHEN Q，et al. Experimental and numerical investigation of hydro-thermally induced shear stimulation[C]// U. S. Symposium on Rock Mechanics. [S. l.]：[s. n.]，2016：1–13.
[19] SHENG M，ZHIPENG X，GENSHENG L. Experimental study on hydro-shearing propagation of an embedded fracture in hot dry granite rock[C]// 2018 GRC Annual Conference. [S. l.]：[s. n.]，2018：1–9.
[20] BIJAY K C，GHAZANFARI E. Geothermal reservoir stimulation through hydro-shearing：an experimental study under conditions close to enhanced geothermal systems[J]. Geothermics，2021，96：102200.
[21] KIM T，JEON S. Experimental study on shear behavior of a rock discontinuity under various thermal，hydraulic and mechanical conditions[J]. Rock Mechanics and Rock Engineering，2019，52：2 207–2 226.
[22] SAMUELSON J，SPIERS C J. Fault friction and slip stability not affected by CO2 storage：Evidence from short-term laboratory experiments on North Sea reservoir sandstones and caprocks[J]. International Journal of Greenhouse Gas Control，2012，11：78–90.
[23] 焦 裕，周永胜，张 雷，等. 流体对石灰岩断层摩擦滑动影响的实验研究[J]. 地球物理学报，2019，62(1)：159–171.(JIAO Yu，ZHOU Yongsheng，ZHANG Lei，et al. Experimental study on the effect of fluid to friction sliding of limestone fault gouge[J]. Chinese Journal of Geophysics，2019，62(1)：159–171.(in Chinese))
[24] ZHANG L，HE C. Frictional properties of phyllosilicate-rich mylonite and conditions for the brittle-ductile transition[J]. Journal of Geophysical Research：Solid Earth，2016，121(4)：3 017–3 047.
[25] 靳佩桦. 高温裂隙花岗岩渗流–传热中裂隙围岩演变特征研究[博士学位论文][D]. 太原：太原理工大学，2019.(JIN Peihua. Study on evolution of fracture and surrounding rock during seepage-heat transfer process of high-temperature fractured granite[Ph. D. Thesis][D]. Taiyuan：Taiyuan University of Technology，2019.(in Chinese))
[26] HUANG Y，ZHANG Y，YU Z，et al. Experimental investigation of seepage and heat transfer in rough fractures for enhanced geothermal systems[J]. Renewable Energy，2019，135：846–855.
[27] SHU B，WANG Y，ZHU R，et al. Experimental study of the heat transfer characteristics of single geothermal fracture at different reservoir temperature and in situ stress conditions[J]. Applied Thermal Engineering，2022，207：118195.
[28] BAI B，HE Y，LI X，et al. Experimental and analytical study of the overall heat transfer coefficient of water flowing through a single fracture in a granite core[J]. Applied Thermal Engineering，2017，116：79–90.
[29] MA Y，GAN Q，ZHANG Y，et al. Experimental research on the heat transfer characteristics of fluid flowing through rock with intersecting fractures[J]. Geothermics，2023，107：102587.
[30] 黄长松，梁卫国，陈跃都，等. 循环高温作用下花岗岩裂缝渗流–传热特性试验研究[J]. 岩石力学与工程学报，2023，42(9)：2 253–2 265.(HUANG Changsong，LIANG Weiguo，CHEN Yuedu，et al. Experimental study on seepage and heat transfer characteristics of single fracture granite under high-temperature cycle conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2023，42(9)：2 253–2 265. (in Chinese))
[31] 于伟东，梁卫国，于艳梅，等. 三轴等压条件下400 ℃内褐煤变形及结构衍化实验研究[J]. 岩石力学与工程学报，2017，36(7)：1 718–1 725.(YU Weidong，LIANG Weiguo，YU Yanmei，et al. Experiment investigation of lignite deformation and structure evolution under triaxial constant stress at temperature below 400 ℃[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(7)：1 718–1 725. (in Chinese))
[32] WAGNER W，PRUSS A. The IAPWS formulation 1995 for the thermodynamic properties of ordinary water substance for general and scientific use[J]. Journal of Physical and Chemical Reference Data，2002，31：387–535.
[33] 王 媛，速宝玉. 单裂隙面渗流特性及等效水力隙宽[J]. 水科学进展，2002，13(1)：61–68.(WANG Yuan，SU Baoyu. Research on the behavior of fluid flow in a single fracture and its equivalent hydraulic aperture[J]. Advance in Water Science，2002，13(1)：61–68.(in Chinese))
[34] 王 珂，盛金昌，郜会彩，等. 应力–渗流侵蚀耦合作用下粗糙裂隙渗流特性研究[J]. 岩土力学，2020，41(增1)：30–40.(WANG Ke，SHENG Jinchang，GAO Huicai，et al. Study on seepage characteristics of rough crack under coupling of stress-seepage erosion[J]. Rock and Soil Mechanics，2020，41(Supp.1)：30–40.(in Chinese))
[35] TSE R，CRUDEN D M. Estimating joint roughness coefficients[J]. International Journal of Rock Mechanics and Mining Sciences and Geomechanics Abstracts，1979，16(5)：303–307.
[36] 李正伟，张延军，张 驰，等. 花岗岩单裂隙渗流传热特性试验[J]. 岩土力学，2018，39(9)：3 261–3 269.(LI Zhengwei，ZHANG Yanjun，ZHANG Chi，et al. Experiment on convection heat transfer characteristics in a single granite fracture[J]. Rock and Soil Mechanics，2018，39(9)：3 261–3 269.(in Chinese))
[37] SHU B，ZHU R，TAN J，et al. Evolution of permeability in a single granite fracture at high temperature[J]. Fuel，2019，242：12–22.
[38] 冯子军，赵阳升，张 渊，等. 热破裂花岗岩渗透率变化的临界温度[J]. 煤炭学报，2014，39(10)：1 987–1 992.(FENG Zijun，ZHAO Yangsheng，ZHANG Yuan，et al. Critical temperature of permeability change in thermally cracked granite[J]. Journal of China Coal Society，2014，39(10)：1 987–1 992.(in Chinese))
[39] 靳佩桦，胡耀青，邵继喜，等. 急剧冷却后花岗岩物理力学及渗透性质试验研究[J]. 岩石力学与工程学报，2018，37(11)：2 556–2 564. (JIN Peihua，HU Yaoqing，SHAO Jixi，et al. Experimental study on physico-mechanical and transport properties of granite subjected to rapid cooling[J]. Chinese Journal of Rock Mechanics and Engineering，2018，37(11)：2 556–2 564.(in Chinese))
[40] 李正伟. 干热岩裂隙渗流–传热试验及储层模拟评价研究[博士学位论文][D]. 长春：吉林大学，2016.(LI Zhengwei. Research on hot dry rock fracture seepage heat transfer experiment and reservoir modeling evaluation[Ph. D. Thesis][D]. Changchun：Jilin University，2016.(in Chinese))
[41] 赵阳升，万志军，康建荣. 高温岩体地热开发导论[M]. 北京：科学出版社，2004：1–67.(ZHAO Yangsheng，WAN Zhijun，KANG Jianrong. Introduction to geothermal extraction of hot dry rock[M]. Beijing：Science Press，2004：1–67.(in Chinese))
[42] SHEN H，ZHANG Q，LI Q，et al. Experimental and numerical investigations of the dynamic permeability evolution of a fracture in granite during shearing under different normal stress conditions[J]. Rock Mechanics and Rock Engineering，2020，53(10)：4 429–4 447.
[43] YANG T，WANG P，WANG S，et al. Experimental study on shear-seepage coupling characteristics of single fractured rock mass under cyclic loading and unloading[J]. Rock Mechanics and Rock Engineering，2023，56：2 137–2 156.
2024, Vol. 43 
