王虎,吴云,王磊,宋金龙

• 1:华北有色工程勘察院有限公司
• 2:中国矿业大学资源与地球科学学院
• 3:南京大学地球科学与工程学院

摘要(Abstract)：

高放射性废物处置、深部地热开采、隧道火灾和煤炭地下气化等工程均会遭受高温作用的影响。【目的】为了研究温度作用对岩石孔隙结构及抗拉强度的影响，探讨温度对岩石的损伤机制，【方法】以山东省临沂市红砂岩为例，对不同温度作用后的红砂岩试样开展物理力学试验，包括借助低场核磁共振和扫描电镜对热处理后红砂岩的微观结构进行测试和观察，以及巴西圆盘劈裂试验。【结果】结果显示：经高温处理，红砂岩纵波速度损失率由0.39%增长至64.60%,质量损失率由1.11%增长至4.29%,孔隙度由2.77%增长至7.73%,抗拉强度由3.43 MPa降至0.88 MPa,单轴抗压强度由64.23 MPa降至38.25 MPa。【结论】结果表明：(1)随着温度升高，红砂岩的纵波波速和质量表现出明显的变化，均随着温度的升高而降低，当温度达到一定程度以后，各孤立的裂隙逐渐连通形成裂隙网络，从而降低红砂岩的抗拉强度；(2)温度能够促进红砂岩孔隙发育，红砂岩内部的纳米孔和微孔逐渐扩展、贯通从而形成中孔，导致红砂岩的连通性增强，孔隙度也相应增大；(3)高温作用后红砂岩的孔隙度参数与力学参数之间存在良好的线性关系，即可以通过岩石的孔隙度来估算力学强度。

关键词(KeyWords)： 热损伤;红砂岩;核磁共振;孔隙结构;抗拉强度

Abstract:

Keywords:

基金项目(Foundation): 安徽建筑大学开放基金资助(KLBSUE-2022-04);; 江苏省卓越博士后计划资助项目(2022ZB509)

作者(Author): 王虎,吴云,王磊,宋金龙

DOI: 10.13928/j.cnki.wrahe.2023.05.015

参考文献(References)：

• [1] 赵怡晴，吴常贵，金爱兵，等.热处理砂岩微观结构及力学性质试验研究[J].岩土力学，2020,41(7):2234-2240.ZHAO Yiqing,WU Changgui,JIN Aibin,et al.Experimental study of sandstone microstructure and mechanical properties under high temperature[J].Rock and Soil Mechanics,2020,41(7):2234-2240.
• [2] 吴云，李晓昭，黄震，等.高温作用后花岗岩单轴压缩下变形破坏特征研究.工程地质学报，2020,28(2):240-245.WU Yun,LI Xiaozhao,HUANG Zhen,et al.Deformation and failure characteristics of granite under uniaxial compression after high temperature[J].Journal of Engineering Geology,2020,28(2):240-245.
• [3] TIAN H,KEMPKA T,YU S,et al.Mechanical properties of sandstones exposed to high temperature[J].Rock Mechanics and Rock Engineering,2016,49(1):321-327.
• [4] YANG Renshu,FANG Shizheng,LI Weiyu.Temperature effects on dynamic compressive behavior of siliceous sandstone[J].Arabian Journal of Geosciences,2020,10:DOI:10.1007/s12517-020-05370-2.
• [5] ZHANG S Q,PATERSON M S,COX S F.Microcrack growth and healing in deformed calcite aggregates[J].Tectonophysics,2001,335(1-2):17-36.
• [6] 熊健，林海宇，刘向君，等.高温对富有机质页岩岩石物理特性的影响[J].石油实验地质，2019,41(6):910-915.XIONG Jian,LIN Haiyu,LIU Xiangjun,et al.High temperature effects on rock physical properties of organic-rich shale[J].Petroleum Geology & Experiment,2019,41(6):910-915.
• [7] 于鑫，李皋，陈泽，等.川西须家河组致密砂岩高温后的物理力学特征参数试验研究[J].地质力学学报，2021,27(1):1-9.YU Xin,LI Gao,CHEN Ze,et al.Experimental study on physical and mechanical characteristics of tight sandstones in the Xujiahe Formation in western Sichuan after high-temperature exposure[J].Journal of Geomechanics,2021,27(1):1-9.
• [8] 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(S2):3805-3816.WU Shunchuan,GUO Pei,ZHANG Shihuai,et al.Study on thermal damage of granite based on Brazilian splitting test[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(S2):3805-3816.
• [9] 方新宇，许金余，刘石，等.高温后花岗岩的劈裂试验及热损伤特性研究[J].岩石力学与工程学报，2016,35(A01):2687-2694.FANG Xinyu,XU Jinyu,LIU Shi,et al.Research on splitting-tensile tests and thermal damage of granite under post-high temperature[J].Chinese Journal of Rock Mechanics and Engineering,2016,35(A01):2687-2694.
• [10] 吴阳春，郤保平，王磊，等.高温后花岗岩的物理力学特性试验研究[J].中南大学学报(自然科学版),2020,51(1):193-203.WU Yangchun,XI Baoping,WANG Lei,et al.Experimental study on physico-mechanical properties of granite after high temperature[J].Journal of Central South University (Science and Technology),2020,51(1):193-203.
• [11] AHMED H M,AHMED H A M,ADEWUYI S O.Characterization of microschist rocks under high temperature at Najran area of Saudi Arabia[J].Energies,2021,156:34-50.
• [12] 孙中光，姜德义，谢凯楠，等.基于低场磁共振的北山花岗岩热损伤研究[J].煤炭学报，2020,45(3):1083-1088.SUN Zhongguang,JIANG Deyi,XIE Kainan,et al.Thermal damage study of Beishan granite based on low field magnetic resonance[J].Journal of China Coal Society,2020,45(3):1083-1088.
• [13] 刘秋桌，雷瑞德.砂岩热损伤微观结构与宏观物理特性演化规律研究[J].隧道建设，2019,39(1):76-80.LIU Qiuzhuo,LEI Ruide.Study of evolution of characteristics of microstructure and macroscopic physical properties of sandstone thermal damage[J].Tunnel Construction,2019,39(1):76-80.
• [14] 邵继喜，胡耀青，刘志军，等.不同温度下砂岩渗透性能的核磁共振响应[J].太原理工大学学报，2020,51(4):605-609.SHAO Jixi,HU Yaoqing,LIU Zhijun,et al.NMR Response of permeability of sandstone subject to different temperatures[J].Journal of Taiyuan University of Technology,2020,51(4):605-609.
• [15] 赵杰，姜亦忠，王伟男，等.用核磁共振技术确定岩石孔隙结构的实验研究[J].测井技术，2003,27(3):185-188.ZHAO Jie,JIANG Yizhong,WANG Weinan,et al.Investigation of rock pore structure using NMR technology[J].Logging Technology,2003,27(3):185-188.
• [16] 李爱芬，任晓霞，王桂娟，等.核磁共振研究致密砂岩孔隙结构的方法及应用[J].中国石油大学学报，2015,39(6):92-98.LI Aifen,REN Xiaoxia,WANG Guijuan,et al.Characterization of pore structure of low permeability reservoirs using a nuclear magnetic resonance method[J].Journal of China University of petroleum,2015,39(6):92-98.
• [17] ZHANG Y L,SUN Q,HE H,et al.Pore characteristics and mechanical properties of sandstone under the influence of temperature[J].Applied Thermal Engineering,2017,113:537-543.
• [18] 吴志军，卢槐，翁磊，等.基于核磁共振实时成像技术的裂隙砂岩渗流特性研究[J].岩石力学与工程学报，2021,40(2):264-272.WU Zhijuan,LU Huai,WEN Lei,et al.Investigations on the seepage characteristics of fractured sandstone based on NMR real-time imaging[J].Chinese Journal of Rock Mechanics and Engineering,2021,40(2):264-272.
• [19] HUANG Z,ZENG W,WU Y,et al.Effects of temperature and acid solution on the physical and tensile mechanical properties of red sandstones.Environmental Science and Pollution Research,2021,28:20608-20623.
• [20] HAO J W,QIAO L,LIU Z Y,et al.Effect of thermal treatment on physical and mechanical properties of sandstone for thermal energy storage:a comprehensive experimental study[J].Acta Geotechnica,2022,17:3887-3908.