Study on Mode Ⅰ and Mode Ⅱ Fracture Characteristics of Granite Under Different Thermal Shock Process
Received date: 2021-07-28
Revised date: 2021-10-03
Online published: 2022-03-07
In the high temperature related disasters occurring in rock engineering,the effect of rapid cooling (thermal shock) can’t be ignored.Therefore,the study on mode Ⅰ and mode Ⅱ fracture toughness of granite under different degrees of thermal shock can provide theoretical basis and technical support for the stability analysis of rock engineering after thermal shock disasters.In this experiment,the granite is heated to the target temperature (200 ℃,400 ℃,600 ℃).According to the characteristics of low freezing point of calcium chloride solution,calcium chloride solution is used as refrigerant,and refrigerants of -20 ℃,20 ℃ and 60 ℃ are obtained by means of freezing and heating respectively,and thermocouple thermometer is used to ensure that the temperature of refrigerating liquid reached the set temperature.Use refrigerants (-20 ℃,20 ℃,60 ℃) for three different cooling rate of the high temperature granite processing,namely the three different levels of thermal shock.The physical properties of the samples are measured before and after heat treatment,including dry density,porosity and P wave velocity.In the end,mode Ⅰ and mode Ⅱ fracture toughness of specimens is tested by Brazilian splitting test.The experimental results show that the dry density and P-wave velocity of heated granite samples decrease with the increase of cooling rate,while the porosity increases with the increase of cooling rate.These phenomena are related to the opening and expansion of pores and micro-cracks caused by thermal shock,that is,more violent thermal shock will cause more serious damage to granite.In addition,with the increase of heating temperature,the sensitivity of the physical properties of heated granite to the temperature change of refrigeration liquid decreases during the cooling process.In terms of fracture toughness,the fracture toughness of granite as a whole decreases significantly with the increase of heating temperature.In addition,at the same high temperature level,the mode Ⅰ and mode Ⅱ fracture toughness of heated granite decreases linearly with the decrease of cooling liquid temperature,which is roughly the same as the change trend of physical properties of granite.The main causes of thermal shock damage are the non-uniform expansion and contraction of minerals inside the rock and the disharmony of deformation caused by the temperature gradient inside and outside the rock.The tensile stress generated by the temperature gradient inside and outside the rock is positively correlated with the temperature difference between granite and refrigerant.
Xiaodong FAN , Xiang LI , Ming TAO , Tubing YIN , Xibing LI . Study on Mode Ⅰ and Mode Ⅱ Fracture Characteristics of Granite Under Different Thermal Shock Process[J]. Gold Science and Technology, 2021 , 29(6) : 834 -842 . DOI: 10.11872/j.issn.1005-2518.2021.06.104
null | Atkinson C, Smelser R E, Sanchez J,1982.Combined mode fracture via the cracked Brazilian disk test[J].International Journal of Fracture,18(4):279-291. |
null | Brotóns V, Tomás R, Ivorra S, al et,2013.Temperature influence on the physical and mechanical properties of a porous rock:San Julian’s calcarenite[J].Engineering Geology,167:117-127. |
null | Cheng Zepeng, Xi Baoping, Yang Xinxin, al et,2021.Experimental study on the evolution of granite permeability under thermal shock[J]. Journal of Taiyuan University of Technology,52(2):198-203. |
null | Collin M, Rowcliffe D,2000.Analysis and prediction of thermal shock in brittle materials[J].Acta Materialia,48(8):1655-1665. |
null | Fowell R,1995.Suggested method for determining mode I fracture toughness using Cracked Chevron Notched Brazilian Disc(CCNBD)specimens[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abs-tracts,32(1):57-64. |
null | Franklin J, Vogler U, Szlavin J, al et,1979.Suggested methods for determining water content,porosity,density,absorption and related properties and swelling and slake-durability index properties: Part 1: Suggested methods for determining water content,porosity,density,absorption and related properties[J].International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts,16(2):143-151. |
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 | He Manchao,2010.The Basis of Deep Rock Mechanics[M].Beijing:Science Press. |
null | He Manchao, Xie Heping, Peng Suping, al et,2005.Study on rock mechanics in deep mining engineering[J].Chinese Jo-urnal of Rock Mechanics and Engineering,(16):2803-2813. |
null | Huang Zhenping, Zhang Yi, Wu Weida,2016.Analysis of mechanical and wave properties of heat-treated marble by water cooling[J].Rock and Soil Mechanics,37(2):367-375. |
null | Kingery W D,1955.Factors affecting thermal stress sesistance of ceramic materials[J]. Journal of the American Ceramic Society,38(1):3-15. |
null | Kuruppu M D, Obara Y, Ayatollahi M R, al et,2014.ISRM-Suggested method for determining the mode I static fracture toughness using semi-circular bend specimen[J].Rock Me-chanics and Rock Engineering,47(1):267-274. |
null | Li Q, Yin T, Li X, al et,2020.Effects of rapid cooling treatment on heated sandstone:A comparison between water and liquid nitrogen cooling[J]. Bulletin of Engineering Geology and the Environment,79(1):313-327. |
null | Li X, Li B, Li X, al et,2020.Thermal shock effects on the mechanical behavior of granite exposed to dynamic loading [J].Archives of Civil and Mechanical Engineering,20(3).DOI: 10.1007/s43452-020-00070-w . |
null | Li X, Zhang Z, 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):6019001. |
null | Liu H, Zhang K, Shao S, al et,2020.Numerical investigation on the cooling-related mechanical properties of heated Australian Strathbogie granite using Discrete Element Method[J].Engineering Geology,264:105371. |
null | Shen Y, Hou X, Yuan J, al et,2019.Experimental study on temperature change and crack expansion of high temperature granite under different cooling shock treatments[J].Energies,12(11):2097. |
null | Tang Shibin, Luo Jiang, Tang Chun’an,2018.Theoretical and numerical study on the cryogenic fracturing in rock[J].Chinese Journal of Rock Mechanics and Engineering,37(7):1596-1607. |
null | Wang Jun, Zhao Lei, Qi Jianghao,2016.Experimental studies on the critical velocity for tunnel fire smoke control under blocked and block-free conditions[J].Journal of Safety and Environment,16(3):62-68. |
null | Wu X, Huang Z, Zhang S, al et,2019.Damage analysis of high-temperature rocks subjected to LN2 thermal shock[J].Ro-ck Mechanics and Rock Engineering,52(8):2585-2603. |
null | Xie Heping,2017.Research framework and anticipated results of deep rock mechanics and mining theory[J].Engineering Science and Technology,49(2):1-16. |
null | Xie Heping, Gao Feng, Ju Yang,2015.Research and development of rock mechanics in deep ground engineering[J].Chinese Journal of Rock Mechanics and Engineering,34(11):2161-2178. |
null | 成泽鹏,郤保平,杨欣欣,等,2021.热冲击作用下花岗岩渗透性演变规律试验研究[J].太原理工大学学报,52(2):198-203. |
null | 何满潮,2010.深部岩体力学基础 [M].北京:科学出版社. |
null | 何满潮,谢和平,彭苏萍,等,2005.深部开采岩体力学研究[J].岩石力学与工程学报,(16):2803-2813. |
null | 黄真萍,张义,吴伟达,2016.遇水冷却的高温大理岩力学与波动特性分析[J].岩土力学,37(2): 367-375. |
null | 唐世斌,罗江,唐春安,2018.低温诱发岩石破裂的理论与数值模拟研究 [J].岩石力学与工程学报,37(7):1596-1607. |
null | 王君,赵蕾,齐江浩,2016.阻塞效应下隧道火灾临界风速的模型试验研究[J].安全与环境学报,16(3):62-68. |
null | 谢和平,2017.“深部岩体力学与开采理论”研究构想与预期成果展望[J].工程科学与技术,49(2):1-16. |
null | 谢和平,高峰,鞠杨,2015.深部岩体力学研究与探索[J].岩石力学与工程学报,34(11):2161-2178. |
/
〈 |
|
〉 |