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| Study on physical and mechanical properties of fracture granite filled with hydrothermal fluid with different types at room temperature |
| SHI Xiaodian1，2，WU Zhisheng1，2，FENG Zijun1，2，HUI Zheng1，2，ZHAO Yangsheng1，2 |
| (1. Key Laboratory of In-situ Modified Mining Ministry of Education，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China；2. Department of Mining Engineering，Taiyuan University of Technology，Taiyuan，Shanxi 030024，China) |
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Abstract In the practical engineering of dry hot rock mining，using rock discontinuities as heat exchange channels will reduce the project investment and obtain better engineering effect. In practice，rock discontinuous structural planes in granite mass are usually filled by hydrothermal fluid，forming fracture granite filled with hydrothermal fluid. Therefore，studies on the physical and mechanical properties of fracture granite filled with hydrothermal fluid are of great significance for the construction of artificial reservoir in the actual geothermal development. In this paper，the samples with different structural types are prepared from the later hydrothermal fluid filled fractured granite mass，and at room temperature，P-wave velocity and compressive strength tests on four structural types(up-down structure，left-right structure，parent rock and filling) of granite samples，and tensile strength and permeability tests on five structural types of granite samples(boundary filling，parent rock，filling，left-right structure and boundary parent rock)，were performed. The results show that，at room temperature，P-wave velocity of up-down and left-right structures is the largest，followed by mother rock and filling body，that under 10MPa confining pressure，the average value of the compressive peak strength sc from large to small is up-down structure，left-right structure，filling and parent rock，and that under the same confining pressure，the permeability k of five types of granite samples from maximum to minimum is filling，parent rock，boundary filling，left-right structural granite and boundary parent rock. After hydrothermal filling，the porosity and the permeability at the cementation surface decrease while the P-wave velocity and the compressive strength increase. The parent rock mineral particles at the cementation surface melt and the hydrothermal fluid enters into the fissures or pores of the parent rock in the process of hydrothermal filling，and after the hydrothermal cooling and crystallization，the“adhesion” and “healing” of the cementation surface account for the change of the physical and mechanical properties of the granite at the cementation surface. It is also revealed that，at room temperature，the average value of the tensile strength st of five types of granite samples from high to low is parent rock，boundary parent rock，left-structure，boundary filling and filling. For the later hydrothermal filled fractured granite mass，the filling is the weakest tensile part of the rock mass，and hence，in the process of geothermal development，artificial fracturing can be carried out on the filling to build artificial reservoir to save the construction cost.
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[1] 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，2004：1–3.(ZHAO Yangsheng，WAN Zhijun，KANG Jianrong. An introduction to hot dry rock(HDR) geothermal exploitation[M]. Beijing：Science Press，2004：1–3.(in Chinese))
[2] 许天福，胡子旭，李胜涛，等. 增强型地热系统：国际研究进展与我国研究现状[J]. 地质学报，2018，9(9)：1 936–1 947.(XU Tianfu，HU Zixu，LI Shengtao，et al. Enhanced geothermal system：international progresses and research status of China[J]. Acta Geologica Sinica，2018，9(9)：1 936–1 947.(in Chinese))
[3] 朱振南，田 红，董楠楠，等. 高温花岗岩遇水冷却后物理力学特性试验研究[J]. 岩土力学，2018，39(增2)：169–176.(ZHU Zhennan，TIAN Hong，DONG Nannan，et al. Experimental study of physico-mechanical properties of heat-treated granite by water cooling[J]. Rock and Soil Mechanics，2018，39(Supp.2)：169–176.(in Chinese))
[4] 崔翰博，唐巨鹏，姜昕彤. 自然冷却和遇水冷却后高温花岗岩力-声特性试验研究[J]. 固体力学学报，2019，40(6)：571–582.(CUI Hanbo，TANG Jupeng，JIANG Xintong. Experimental study on mechanical and acoustic characteristics of high-temperature granite after natural cooling and water cooling[J]. Chinese Journal of Solid Mechanics，2019，40(6)：571–582.(in Chinese))
[5] 杜守继，马 明，陈浩华，等. 花岗岩经历不同高温后纵波波速分析[J]. 岩石力学与工程学报，2003，22(11)：1 803–1 806.(DU Shouji，MA Ming，CHEN Haohua，et al. Testing study on longitudinal wave characteristics of granite after high temperature[J]. Chinese Journal of Rock Mechanics and Engineering，2003，22(11)：1 803–1 806.(in Chinese))
[6] 宫嘉辰，陈士海. 高地应力下砂岩力学参数和波速变化规律试验研究[J]. 山东大学学报：工学版，2020，50(3)：82–87.(GONG Jiachen，CHEN Shihai. Experimental study on mechanical parameters and wave velocity variation of sandstone under high ground stress[J]. Journal of Shandong University：Engineering Science，2020，50(3)：82–87.(in Chinese))
[7] 陈宇龙，张 玉. 不同温度热处理石灰岩的物理力学性质试验研究[J]. 岩石力学与工程学报，2017，36(增2)：3 732–3 739.(CHEN Yulong，ZHANG Yu. Experimental study of physical and mechanical behavior of limestone subjected to different heat treatment temperatures[J]. Chinese Journal of Rock Mechanics and Engineering，2017，36(Supp.2)：3 732–3 739.(in Chinese))
[8] 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)：1 970–1 976. (ZHAO Yangsheng，WAN Zhijun，ZHANG Yuan，et al. Experimental study of relation laws of rock thermal cracking and permeability[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(10)：1 970–1 976.(in Chinese))
[9] 朱振南，田 红，董楠楠，等. 高温花岗岩遇水冷却后物理力学特性试验研究[J].岩土力学，2018，39(增2)：169–176.(ZHU Zhennan，TIAN Hong，DONG Nannan，et，al. Experimental study of physico-mechanical properties of heat-treated granite by water cooling[J]. Rock and Soil Mechanics，2018，39(Supp.2)：169–176.(in Chinese))
[10] ZHAO Y，WAN Z，FENG Z，et al. Evolution of mechanical properties of granite at high temperature and high pressure[J]. Geomechanics and Geophysics for Geo-energy and Geo-resources，2017，3(2)：199–210.
[11] 赵阳升，孟巧荣，康天合，等. 显微CT试验技术与花岗岩热破裂特征的细观研究[J]. 岩石力学与工程学报，2008，27(1)：28–34.(ZHAO Yangsheng，MENG Qiaorong，KANG Tianhe，et al. Micro CT experimental technology and meso-investigation on thermal fracturing characteristics of granite[J]. Chinese Journal of Rock Mechanics and Engineering，2008，27(1)：28–34.(in Chinese))
[12] 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))
[13] 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))
[14] JIN P，HU Y，SHAO J，et al. Influence of different thermal cycling treatments on the physical，mechanical and transport properties of granite[J]. Geothermics，2019，78：118–128.
[15] 徐小丽，高 峰，高亚楠，等. 高温后花岗岩力学性质变化及结构效应研究[J]. 中国矿业大学学报，2008，37(3)：402–406.(XU Xiaoli，GAO Feng，GAO Yanan，et al. Effect of high temperatures on the mechanical characteristics and crystal structure of granite[J]. Journal of China University of Mining and Technology，2008，37(3)：402–406.(in Chinese))
[16] 徐小丽，高 峰，张志镇. 高温后围压对花岗岩变形和强度特性的影响[J]. 岩土工程学报，2014，36(12)：2 246–2 252.(XU Xiaoli，GAO Feng，ZHANG Zhizhen. Influence of confining pressure on deformation and strength properties of granite after high temperatures[J]. Chinese Journal of Geotechnical Engineering，2014，36(12)：2 246–2 252.(in Chinese))
[17] 吴顺川，郭 沛，张诗淮，等. 基于巴西劈裂试验的花岗岩热损伤研究[J]. 岩石力学与工程学报，2018，37(增2)：3 805–3 816.(WU Shunchuan，GUO Pei，ZHANG Shihuai，et al. Study on thermal damage of granite based on Brazilian splitting test[J]. Journal of Rock Mechanics and Engineering，2018，37(Supp.2)：3 805–3 816.(in Chinese))
[18] 梁 铭，张绍和，舒 彪. 不同冷却方式对高温花岗岩巴西劈裂特性的影响[J]. 水资源与水工程学报，2018，29(2)：186–193.(LIANG Ming，ZHNAG Shaohe，SHU Biao. Effect of different cooling ways on Brazilian tension characteristics of heat-treated granite[J]. Journal of Water Resources and Water Engineering，2018，29(2)：186–193.(in Chinese))
[19] 周安朝，赵阳升，郭进京，等. 西藏羊八井地区高温岩体地热开采方案研究[J]. 岩石力学与工程学报，2010，29(增2)：4 089– 4 095.(ZHOU Chaoan，ZHAO Yangsheng，GUO Jinjing，et al. Study of geothermal extraction scheme of hot dry rock in tibetan yangbajing region[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：4 089–4 095.(in Chinese))
[20] YIN W，ZHAO Y，FENG Z Experimental research on the rupture characteristics of fractures subsequently filled by magma and hydrothermal fluid in hot dry rock[J]. Renewable Energy，2019，139：71–79.
[21] YIN W，ZHAO Y，FENG Z. Experimental research on the permeability of fractured-subsequently-filled granite under high temperature-high pressure and the application to HDR geothermal mining[J]. Renewable Energy，2020，153，499–508.
[22] 孙 强，张志镇，薛 雷，等. 岩石高温相变与物理力学性质变化[J]. 岩石力学与工程学报，2013，32(5)：935–942.(SUN Qiang，ZHANG Zhizhen，XUE Lei，et al. Physico-mechanical properties variation of rock with phase transformation under high temperature[J]. Chinese Journal of Rock Mechanics and Engineering，2013，32(5)：935–942.(in Chinese))
[23] 孔宪立，石振明. 工程地质学[M]. 北京：中国建筑工业出版社，2011：12–15.(KONG Xianli，SHI Zhenming. Engineering geology[M]. Beijing：China Architecture & Building Press，2011：12–15.(in Chinese))
[24] 琚晓冬，邹正盛，冯文娟. 工程地质[M]. 北京：清华大学出版社，2019：120.(JU Xiaodong，ZHOU Zhengsheng，FENG Wenjuan. Engineering geology[M]. Beijing，Tsinghua University Press，2019：120.(in Chinese))
[25] 谢和平，陈至达. 岩石断裂的微观机制分析[J]. 煤炭学报，1989，(2)：57–67.(XIE Heping，CHEN Zhida. Analysis of microscopic mechanism of rock fracture[J]. Journal of China Coal Society，1989，(2)：57–67.(in Chinese)) |
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2021, Vol. 40 
