Effect of Thermal Shock on the Dynamic Tensile Mechanical Behavior of Granite
Received date: 2020-08-31
Revised date: 2020-12-30
Online published: 2021-10-08
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.
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
null | Dai F,Huang S,Xia K,al et,2010.Some fundamental issues in dynamic compression and tension tests of rocks using split Hopkinson pressure bar[J].Rock Mechanics and Rock Engineering,43(6):657-666. |
null | Dolino G,Bachheimer J P,1982.Effect of the α—β transition on mechanical properties of quartz[J].Ferroelectrics,43(1):77-86. |
null | Du Shouji,Liu Hua,Zhi Hongtao,al et,2004.Testing study on mechanical properties of post-high-temperature granite[J].Chinese Journal of Rock Mechanics and Engineering,23(14):2359-2364. |
null | Fuenkajorn K,Kenkhunthod N,2010.Influence of loading rate on deformability and compressive strength of three thai sandstones[J].Geotechnical and Geological Engineering,28(5):707-715. |
null | Hall K,Thorn C E,2014.Thermal fatigue and thermal shock in bedrock:An attempt to unravel the geomorphic processes and products[J].Geomorphology,206:1-13. |
null | Han G S,Jing H W,Su H J,al et,2019.Effects of thermal shock due to rapid cooling on the mechanical properties of sandstone[J].Environmental Earth Sciences,78(5):1-9. |
null | Huang Y H,Yang S Q,Bu Y S,2020.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. |
null | Huang Zhongwei,Wen Haitao,Wu Xiaoguang,al et,2019.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. |
null | 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 Abstracts,16(2):151-156. |
null | Li X,Zhang Z Y,Chen W,al et,2019.Mode Ⅰ and Mode Ⅱ granite fractures after distinct thermal shock treatments[J].Journal of Materials in Civil Engineering,31(4):06019001. |
null | Liu S,Xu J Y,2014.Mechanical properties of Qinling biotite granite after high temperature treatment[J].International Journal of Rock Mechanics and Mining Sciences,71:188-193. |
null | Memari A,Khoshravan Azar M R,2019.Thermo-mechanical shock fracture analysis by meshless method[J].Theoretical and Applied Fracture Mechanics,102:171-192. |
null | Ozguven A,Ozcelik Y,2014.Effects of high temperature on physico-mechanical properties of Turkish natural building stones[J].Engineering Geology,183:127-136. |
null | Richter D,Simmons G,1974.Thermal expansion behavior of igneous rocks[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,11(10):403-411. |
null | Sirdesai N N,Singh T N,Ranjith P G,al et,2017.Effect of varied durations of thermal treatment on the tensile strength of red sandstone[J].Rock Mechanics and Rock Engineering,50(1):205-213. |
null | Wan Zhang.Experimental Study on Dynamic Behavior of Thermal Treated Granite[D].Hangzhou:Zhejiang University,2017. |
null | Wang P,Xu J Y,Fang X Y,al et,2017.Dynamic splitting tensile behaviors of red-sandstone subjected to repeated thermal shocks:Deterioration and micro-mechanism[J].Engineering Geology,223:1-10. |
null | Wang P,Xu J Y,Liu S H,al et,2016.Dynamic mechanical properties and deterioration of red-sandstone subjected to repeated thermal shocks[J].Engineering Geology,212:44-52. |
null | Wang Q Z,Li W,Xie H P,2009.Dynamic split tensile test of Flattened Brazilian Disc of rock with SHPB setup[J].Mechanics of Materials,41(3):252-260. |
null | Wang Xinmin,Xiao Weiguo,Zhang Qinli,2005.Theory and Technology of Deep Mine Filling[M].Changsha:Central South University Press. |
null | Wire W O,2011.Parker Drilling-operated Yastreb rig sets new world record[N/OL].Worldoil,(2011-02-22)[2020-07-01].. |
null | Wu Hao,Xu Feng,Zhang Ping,2019.Effect of high temperature on strength characteristics of sandstone[J].Safety in Coal Mines,50(7):61-64. |
null | Xi Baoping,Wu Yangchun,Wang Shuai,al et,2020.Evolution of mechanical properties of granite under thermal shock in water with different cooling temperatures[J].Rock and Soil Mechanics,41(Supp.1):83-94. |
null | Yin T B,Bai L,Li X B,al et,2018.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. |
null | Yin T B,Li X B,Cao W Z,al et,2015.Effects of thermal treatment on tensile strength of laurentian granite using brazilian test[J].Rock Mechanics and Rock Engineering,48(6):2213-2223. |
null | Yin T B,Shu R H,Li X B,al et,2016a.Comparison of mechanical properties in high temperature and thermal treatment granite[J].Transactions of Nonferrous Metals Society of China,26(7):1926-1937. |
null | Yin T B,Wang P,Li X B,al et,2016b.Effects of thermal treatment on physical and mechanical characteristics of coal rock[J].Journal of Central South University,23(9):2336-2345. |
null | Zhao J,Li H B,2000.Experimental determination of dynamic tensile properties of a granite[J].International Journal of Rock Mechanics and Mining Sciences,37(5):861-866. |
null | Zhao Z H,Liu Z N,Pu H,al et,2018.Effect of thermal treatment on brazilian tensile strength of granites with different grain size distributions[J].Rock Mechanics and Rock Engineering,51(4):1293-1303. |
null | Zhou Z L,Li X B,Liu A H,al et,2011.Stress uniformity of split Hopkinson pressure bar under half-sine wave loads[J].International Journal of Rock Mechanics and Mining Sciences,48(4):697-701. |
null | 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. |
null | 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. |
null | 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. |
null | 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. |
null | 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. |
null | 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. |
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