组合冷却后高温花岗岩物理力学及劈裂面粗糙度试验研究

doi:10.13722/j.cnki.jrme.2010.1032

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Abstract During injection heat mining，new crack passages are developed between water cooling parts and natural cooling parts of hot dry rock(HDR)，and crack roughness has direct effects on seepage heat transfer of fluids. In this study，taking the granite in Daqing area of northern Songliao basin as the research object，Combined cooling of different initial temperatures(100 ℃–600 ℃) and different cooling ratios(0% immersion cooling，25% immersion cooling，50% immersion cooling，75% immersion cooling and 100% immersion cooling) were performed on the specimens(partly placed in water and partly kept in air)，and Brazilian split tests on the heat-treated specimens were performed. The cleavage surface roughness of the samples was measured by the customized roughness profiler to clarify the variations of physical and mechanical properties(apparent temperature，upshift of immersion surface，morphology and tensile strength) and cleavage surface roughness features(height difference parameters：distributions of peak and trough of height difference and mean square error of height；texture parameters：roughness coefficient and rough angle) of granite under the specific conditions. Meanwhile，the correlation of height difference parameters and texture parameters was investigated and the tensile strength-roughness fitting curve was developed. The results demonstrate that the reduction of the apparent temperature of the rock is proportional to the initial temperature and the reduction rate of the immersion cooling part exceeds that of the natural cooling part. During immersion water cooling，the immersion surface shifts upward and the upshift is proportional to the temperature. In extreme cases，the apparent temperature may be below 400 ℃ when the initial temperature is 500 ℃–600 ℃. The distribution of the height difference peak appears to the water cooling part as the temperature increases. With an initial temperature of 600 ℃ and an immersion cooling height ratio of 3/4，the tensile strength loss is maximized(84.88%，14.84%) and crack height difference parameters and texture parameters reach their extremes. The fitting coefficients of the tensile strength and roughness features at different temperatures are relatively high. However，the fitting coefficients at different water cooling ratios are relatively low but still remain in a reasonable range. Therefore，the determination of the rock cleavage surface roughness based on the tensile strength is highly feasible. This study provides references to the understanding of crack propagations in HDR in case of thermal cracking.

Key words： rock mechanics combined cooling thermal cracking immersion water cooling ratios cleavage surface roughness

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	CUI Hanbo
	TANG Jupeng
	JIANG Xintong

Cite this article:

CUI Hanbo,TANG Jupeng,JIANG Xintong. Experimental study on mechanical performances and cleavage surface roughness of high-temperature granite after combined cooling#br#[J]. , 2021, 40(7): 1444-1459.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2010.1032 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I7/1444

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