王超;尹土兵;
WANG Chao;YIN Tu-bing;School of Resources and Safety Engineering, Central South University;Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines, Central South University;

• 1:中南大学资源与安全工程学院
• 2:中南大学深部金属矿产开发与灾害控制湖南省重点实验室

摘要(Abstract)：

为了开展实时高温下及加热冷却后岩石动态力学性质的对比研究,利用自行设计的加热装置结合SHPB系统对两种温度状态砂岩的动态拉伸特性进行试验研究,处理温度为常温(25℃)～600℃共7组。结果表明:砂岩的率效应在两种温度状态下都存在,热处理后的砂岩拉伸强度除100℃外都比常温状态小,且随着热处理温度的增大,拉伸强度减小,温度会影响试样的破坏形态。高温下砂岩的拉伸强度除600℃外都比常温状态大,且拉伸强度随着温度的升高先增大后减小,加载率对破坏模式起主导作用。高温下的热膨胀作用会抑制裂纹相互连接,使得岩石结构更加密实,导致砂岩在实时高温下的拉伸强度相比加热冷却后有很大的区别。
In order to carry out the comparative study of dynamic mechanical properties of rock at real-time high temperatures and after thermal treatment, the dynamic tensile properties of sandstone under the two temperature states were experimentally studied by using a self-designed heating device and the SHPB system, and the test temperatures were 7 groups from room temperature 25 ℃ to 600 ℃. The results show that the rate effect of sandstone exists at both states. The tensile strength of sandstone after heat treatment is lower than that of room temperature except for 100 ℃ and decreases with the increase of heat treatment temperature, and the temperature affects the failure mode of the sample. Under real-time high temperatures, the tensile strength of sandstone is higher than that of room temperature except for 600 ℃, and increases first and then decreases with the increase of temperature, while the loading rate plays a dominant role in the failure mode. The thermal expansion effect at high temperature will inhibit the interconnection of cracks and make the rock structure more compact, resulting in the great difference in tensile strength of sandstone at real-time high temperatures compared with heating and cooling.

关键词(KeyWords)： 砂岩;高温;SHPB;拉伸强度;破坏模式
sandstone;high temperature;SHPB;tensile strength;failure mode

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目(51774325,41972283)

作者(Authors): 王超;尹土兵;
WANG Chao;YIN Tu-bing;School of Resources and Safety Engineering, Central South University;Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines, Central South University;

DOI: 10.19931/j.EB.20210022

参考文献(References)：

• [1] CAI M F,BROWN E T.Challenges in the mining and utilization of deep mineral resources[J].Engineering,2017,3(4):432-433.
• [2] 蔺文静，刘志明，王婉丽，等.中国地热资源及其潜力评估[J].中国地质，2013,40(1):312-321.LIN W J,LIU Z M,WANG W L,et al.The assessment of geothermal resources potential of China[J].Geology in China,2013,40(1):312-321.
• [3] 张玉良，孙强，李进学，等.高温焙烧后黏土孔隙与力学特征研究[J].岩石力学与工程学报，2015,34(7):1 480-1 488.ZHANG Y L,SUN Q,LI J X,et al.Pore and mechanical characteristics of high-temperature baked clay[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(7):1 480-1 488.
• [4] LI X,ZHANG K,HEINZ K,et al.Experimental study on the dynamic mechanical behaviors of silicon carbide ceramic after thermal shock[J].Nuclear Materials and Energy,2020,24:100774.
• [5] 刘康，郭东明，陈亮亮，等.爆炸载荷下邻近巷道围岩破坏规律试验研究[J].爆破，2020,37(3):15-20.LIU K,GUO D M,CHEN L L,et al.Experimental study on surrounding rock failure law of adjacent roadway under explosive loading [J].Blasting,2020,37(3):15-20.
• [6] 李夕兵.岩石动力学基础与应用[M].北京：科学出版社，2014.LI X B.Rock dynamics fundamentals and applications[M].Beijing:Science Press,2014.
• [7] 刘石，许金余，白二雷，等.高温后大理岩动态劈裂拉伸试验研究[J].岩土力学，2013,34(12):3 500-3 504.LIU S,XU J Y,BAI E L,et al.Experimental study of dynamic tensile behaviors of marble after high temperature[J].Rock and Soil Mechanics,2013,34(12):3 500-3 504.
• [8] 夏开文，蔡英鹏，徐颖，等.静水压下热损伤大理岩动态拉伸特性研究[J].天津大学学报(自然科学与工程技术版),2020,53(11):1 136-1 145.XIA K W,CAI Y P,XU Y,et al.Experimental study of dynamic tensile failure of thermally damaged Fangshan marble subjected to hydrostatic confinement[J].Journal of Tianjin University(Science and technology),2020,53(11):1 136-1 145.
• [9] MARDOUKHI A,MARDOUKHI Y,HOKKA M,et al.Effects of heat shock on the dynamic tensile behavior of granitic rocks[J].Rock Mechanics and Rock Engineering,2017,50(5):1 171-1 182.
• [10] YAO W,XU Y,WANG W,et al.Dependence of dynamic tensile strength of longyou sandstone on heat-treatment temperature and loading rate[J].Rock Mechanics and Rock Engineering,2016,49(10):3 899-3 915.
• [11] 吴刚，王德咏，翟松韬，等.高温下大理岩力学性质的试验研究[J].岩石力学与工程学报，2012,31(6):1 237-1 244.WU G,WANG D Y,ZHAI S T,et al.Test research on mechanical properties of marble under high temperature[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1 237-1 244.
• [12] YIN T B,SHU R H,LI X B,et al.Comparison of mechanical properties in high temperature and thermal treatment granite[J].Transactions of Nonferrous Metals Society of China,2016,26(7):1 926-1 937.
• [13] ZHANG C,SUO T,TAN W L,et al.An experimental method for determination of dynamic mechanical behavior of materials at high temperatures[J].International Journal of Impact Engineering,2017,102:27-35.
• [14] 平琦，吴明静，袁璞，等.冲击载荷作用下高温砂岩动态力学性能试验研究[J].岩石力学与工程学报，2019,38(4):782-792.PING Q,WU M J,YUAN P,et al.Experimental study on dynamic mechanical properties of high temperature sandstone under impact loads[J].Chinese Journal of Rock Mechanics and Engineering,2019,38(4):782-792.
• [15] WONG L N Y,LI Z H,KANG H M,et al.Dynamic loading of carrara marble in a heated state[J].Rock Mechanics and Rock Engineering,2017,50(6):1 487-1 505.
• [16] 尹土兵，王超，吴攸，等.一种高温下岩石动态力学性能测试方法及配套使用的加热炉[P].CN111024529A,2020-04-17.YIN T B,WANG C,WU Y,et al.A method for testing the dynamic mechanical properties of rock under high temperature and a heating furnace for supporting use[P].CN111024529A,2020-04-17.
• [17] ZHOU Y X,XIA K W,LI X B,et al.Suggested methods for determining the dynamic strength parameters and mode-I fracture toughness of rock materials[J].International Journal of Rock Mechanics and Mining Sciences,2012,49:105-112.
• [18] LI X B,LOK T S,ZHAO J,et al.Oscillation elimination in the Hopkinson bar apparatus and resultant complete dynamic stress-strain curves for rocks[J].International Journal of Rock Mechanics and Mining Sciences,2000,37(7):1 055-1 060.
• [19] KOLAKY H.An investigation of the mechanical properties of materials at very high rates of loading[J].Proceedings of the Physical Society.Section B,1949,62(11):676-700.
• [20] XIA K W,YAO W.Dynamic rock tests using split Hopkinson (Kolsky) bar system – A review[J].Journal of Rock Mechanics and Geotechnical Engineering,2015,7(1):27-59.
• [21] 宫凤强，王进，李夕兵.岩石压缩特性的率效应与动态增强因子统一模型[J].岩石力学与工程学报，2018,37(7):1 586-1 595.GONG F Q,WANG J,LI X B.The rate effect of compression characteristics and a unified model of dynamic increasing factor for rock materials[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(7):1 586-1 595.
• [22] GLOVER P W J,BAUD P,DAROT M,et al.α/β phase transition in quartz monitored using acoustic emissions[J].Geophysical Journal International,1995,120(3):775-782.