[an error occurred while processing this directive] [an error occurred while processing this directive] [an error occurred while processing this directive]
[an error occurred while processing this directive]
Mining Technology and Mine Management

Effect of Thermal Shock on the Dynamic Tensile Mechanical Behavior of Granite

  • Baijin LI , 1 ,
  • Xiang LI 1, 2 ,
  • Yan WANG , 3 ,
  • Tubing YIN 1 ,
  • Xibing LI 1
Expand
  • 1. School of Resources and Safety Engineering,Central South University,Changsha 410083,Hunan,China
  • 2. School of Civil Engineering,Sun Yat-sen University,Zhuhai 519082,Guangdong,China
  • 3. School of Mechanical and Electrical Engineering,Central South University,Changsha 410012,Hunan,China

Received date: 2020-08-31

  Revised date: 2020-12-30

  Online published: 2021-10-08

Highlights

Under certain conditions,such as the drilling surrounding rock cooled by drilling fluid in geothermal development,the surrounding rock rapid cooled in the process of extinguishing the fire,rock in rock mass engineering will experience rapid temperature change(thermal shock).Therefore the study of thermal shock in rocks is of great significance for stability analysis of rock structure affected by thermal shock.Granite specimens were heated to the high temperatures of 200 ℃,400 ℃ and 600 ℃,and then cooled by three methods of water cooling,air cooling and cooling in the stove.The physical properties such as dry density,P-wave velocity,porosity of granite after distinctive thermal shock were measured.The dry density and porosity were measured with buoyancy techniques.The P-wave velocity was measured by a non-destructive ultrasonic detector.As the heating level and cooling rate rise,the dry density and P-wave velocity present a descending trend,and the porosity presents an ascending trend.The damage degree of granite increases with the increase of heating temperature and cooling rate.The dynamic tensile tests were performed on the specimens after distinctive thermal shock treatment utilizing the split Hopkinson pressure bar system.The dynamic tensile strength of granite heated at 600 ℃ is less than that of granite heated at 400 ℃ and 200 ℃,and the dynamic tensile strength of water-cooled granite is less than that of air-cooled and stove-cooled granite.The damage degree of the granite caused by thermal shock was analyzed by the crack morphology of the specimens recorded by high-speed photography during the tensile failure and the morphology of the broken pieces after failure.The results show that the damage degree of granite increases with the increase of heating level and cooling rate.Scanning electron microscopy (SEM) was used to identify the microcosmic damage and fracture characteristics of granite caused by thermal shock.There are two kinds of characteristic fracture morphology of thermal shock were observed on the specimens after heated at 400 ℃ and 600 ℃ (both air-cooled and water-cooled conditions).However,neither fracture morphology can be found at 200 ℃ (including 3 kinds of cooling conditions).Therefore,there is no thermal shock at 200 ℃;When the heating level reaches 400 ℃,the granite is damaged by high temperature and thermal shock.When the heating level reaches 600 ℃,the granite is badly damaged.And the damage degree of granite increases with the increase of heating temperature and cooling rate.This study can provide theoretical basis for the analysis of thermal shock damage and the evaluation of rock mass stability after high temperature disaster in practical engineering.

Cite this article

Baijin LI , Xiang LI , Yan WANG , Tubing YIN , Xibing LI . Effect of Thermal Shock on the Dynamic Tensile Mechanical Behavior of Granite[J]. Gold Science and Technology, 2021 , 29(4) : 545 -554 . DOI: 10.11872/j.issn.1005-2518.2021.04.156

[an error occurred while processing this directive]

国内最大地下有色金属矿山普朗铜矿率先实现5G工业应用

据2021年8月18日报道,云南迪庆有色金属有限责任公司、中铝智能铜创科技(云南)有限公司联合中国移动云南公司、华为技术有限公司在昆明举行普朗铜矿5G智能矿山发布会。由四方联合攻关打造的5G智能矿山正式实现工业应用。国内最大地下有色金属矿山——普朗铜矿也由此成为全国首个实现5G工业应用的有色金属地下矿山和全国首个高海拔地区5G智能矿山。

据了解,普朗铜矿位于香格里拉市区东北部,矿区海拔3 400~4 500 m,高寒缺氧的自然环境给安全生产带来较大挑战。引入5G技术建设智能矿山,是迪庆有色建设世界一流铜矿山路上的重大战略构想之一。2020年,迪庆有色从充分发挥先进采矿工艺技术装备能力和进一步提升规模生产优势角度出发,在年初开启了“5G+智能矿山”建设步伐。在一年多的时间里,迪庆有色与中铝智能铜创科技等单位密切协作,先后完成了需求调研、设计勘查、5G建设、技术验证等系列工作,建成了5G工业专网,并于2021年5~6月进行了矿山生产智能装备、智能控制系统的调试,让5G智能矿山工业应用在矿山实现成功落地。

矿山设备进行5G智能控制后,实现了5G+有轨运输无人驾驶系统、5G+铲运机无人驾驶系统、5G+井下VoLTE视频通话、5G+井下安全六大系统、5G+尾矿库安全在线监测系统、5G+人员智能安全管理系统等科技创新工业应用,开启了井下穿脉内铲、运、卸矿作业自动化、智能化模式,对于提升井下铲运矿设备效率和生产本质化安全水平,减少井下巡查作业人员并逐步实现“少人、无人”目标具有重要的现实意义。

http://www.goldsci.ac.cn/article/2021/1005-2518/1005-2518-2021-29-4-545.shtml

Dai F Huang S Xia K al et2010.Some fundamental issues in dynamic compression and tension tests of rocks using split Hopkinson pressure bar[J].Rock Mechanics and Rock Engineering43(6):657-666.

Dolino G Bachheimer J P1982.Effect of the α—β transition on mechanical properties of quartz[J].Ferroelectrics43(1):77-86.

Du Shouji Liu Hua Zhi Hongtao al et2004.Testing study on mechanical properties of post-high-temperature granite[J].Chinese Journal of Rock Mechanics and Engineering23(14):2359-2364.

Fuenkajorn K Kenkhunthod N2010.Influence of loading rate on deformability and compressive strength of three thai sandstones[J].Geotechnical and Geological Engineering28(5):707-715.

Hall K Thorn C E2014.Thermal fatigue and thermal shock in bedrock:An attempt to unravel the geomorphic processes and products[J].Geomorphology,206:1-13.

Han G S Jing H W Su H J al et2019.Effects of thermal shock due to rapid cooling on the mechanical properties of sandstone[J].Environmental Earth Sciences78(5):1-9.

Huang Y H Yang S Q Bu Y S2020.Effect of thermal shock on the strength and fracture behavior of pre-flawed granite specimens under uniaxial compression[J].Theoretical and Applied Fracture Mechanics,106:102474.

Huang Zhongwei Wen Haitao Wu Xiaoguang al et2019.Experimental study on cracking of high temperature granite using liquid nitrogen[J].Journal of China University of Petroleum(Edition of Natural Science)43(2):68-76.

ISRM,1979.Suggested methods for determining water content,porosity density,absorption and related properties and swelling and slake-durability index properties[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts16(2):151-156.

Li X Zhang Z Y Chen W al et2019.Mode Ⅰ and Mode Ⅱ granite fractures after distinct thermal shock treatments[J].Journal of Materials in Civil Engineering31(4):06019001.

Liu S Xu J Y2014.Mechanical properties of Qinling biotite granite after high temperature treatment[J].International Journal of Rock Mechanics and Mining Sciences,71:188-193.

Memari A Khoshravan Azar M R2019.Thermo-mechanical shock fracture analysis by meshless method[J].Theoretical and Applied Fracture Mechanics,102:171-192.

Ozguven A Ozcelik Y2014.Effects of high temperature on physico-mechanical properties of Turkish natural building stones[J].Engineering Geology,183:127-136.

Richter D Simmons G1974.Thermal expansion behavior of igneous rocks[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts11(10):403-411.

Sirdesai N N Singh T N Ranjith P G al et2017.Effect of varied durations of thermal treatment on the tensile strength of red sandstone[J].Rock Mechanics and Rock Engineering50(1):205-213.

Wan Zhang.Experimental Study on Dynamic Behavior of Thermal Treated Granite[D].Hangzhou:Zhejiang University,2017.

Wang P Xu J Y Fang X Y al et2017.Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks:Deterioration and micro-mechanism[J].Engineering Geology,223:1-10.

Wang P Xu J Y Liu S H al et2016.Dynamic mechanical properties and deterioration of red-sandstone subjected to repeated thermal shocks[J].Engineering Geology,212:44-52.

Wang Q Z Li W Xie H P2009.Dynamic split tensile test of Flattened Brazilian Disc of rock with SHPB setup[J].Mechanics of Materials41(3):252-260.

Wang Xinmin Xiao Weiguo Zhang Qinli2005.Theory and Technology of Deep Mine Filling[M].Changsha:Central South University Press.

Wire W O2011.Parker Drilling-operated Yastreb rig sets new world record[N/OL].Worldoil,(2011-02-22)[2020-07-01].

Wu Hao Xu Feng Zhang Ping2019.Effect of high temperature on strength characteristics of sandstone[J].Safety in Coal Mines50(7):61-64.

Xi Baoping Wu Yangchun Wang Shuai al et2020.Evolution of mechanical properties of granite under thermal shock in water with different cooling temperatures[J].Rock and Soil Mechanics41(Supp.1):83-94.

Yin T B Bai L Li X B al et2018.Effect of thermal treatment on the mode Ⅰ fracture toughness of granite under dynamic and static coupling load[J].Engineering Fracture Mechanics,199:143-158.

Yin T B Li X B Cao W Z al et2015.Effects of thermal treatment on tensile strength of laurentian granite using brazilian test[J].Rock Mechanics and Rock Engineering48(6):2213-2223.

Yin T B Shu R H Li X B al et2016a.Comparison of mechanical properties in high temperature and thermal treatment granite[J].Transactions of Nonferrous Metals Society of China26(7):1926-1937.

Yin T B Wang P Li X B al et2016b.Effects of thermal treatment on physical and mechanical characteristics of coal rock[J].Journal of Central South University23(9):2336-2345.

Zhao J Li H B2000.Experimental determination of dynamic tensile properties of a granite[J].International Journal of Rock Mechanics and Mining Sciences37(5):861-866.

Zhao Z H Liu Z N Pu H al et2018.Effect of thermal treatment on brazilian tensile strength of granites with different grain size distributions[J].Rock Mechanics and Rock Engineering51(4):1293-1303.

Zhou Z L Li X B Liu A H al et2011.Stress uniformity of split Hopkinson pressure bar under half-sine wave loads[J].International Journal of Rock Mechanics and Mining Sciences48(4):697-701.

杜守继,刘华,职洪涛,等,2004.高温后花岗岩力学性能的试验研究[J].岩石力学与工程学报23(14):2359-2364.

黄中伟,温海涛,武晓光,等,2019.液氮冷却作用下高温花岗岩损伤实验[J].中国石油大学学报(自然科学版)43(2):68-76.

万璋.高温后花岗岩动态力学特性实验研究[D].杭州:浙江大学,2017.

王新民,肖卫国,张钦礼,2005.深井矿山充填理论与技术[M].长沙:中南大学出版社.

吴豪,徐峰,张萍,2019.高温对砂岩强度特性的影响试验研究[J].煤矿安全50(7):61-64.

郤保平,吴阳春,王帅,等,2020.热冲击作用下花岗岩力学特性及其随冷却温度演变规律试验研究[J].岩土力学41(增1):83-94.

Outlines

/

[an error occurred while processing this directive]