酸蚀作用对岩石裂隙剪切行为的影响规律研究

doi:10.13722/j.cnki.jrme.2022.0588

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Abstract The multi-stage hydraulic-acid stimulation has become a key technology for permeability enhancement of geothermal reservoirs. In this study，the artificial fracture samples were artificially produced from the granite collected from Gonghe Basin，China，direct shear tests were performed on each fracture sample for six times after different acid immersion treatments. The results show that the shear behavior of rock fractures changes from brittle failure to ductile failure after during the previous five shear tests. The peak shear strength significantly reduces，but the residual shear strength does not change significantly during the previous five shear tests. After acid immersion treatment，the shear behavior of the rock fractures still exhibits ductile failure，but the peak and residual shear strengths significantly reduce. Based on wear theory，a formula of calculating shear-induced damage volume of rough fractures is developed，which is in good agreement with the experimental results. After acid immersion treatment，the differential dissolution rates of different minerals increase the fracture surface roughness，but the acid corrosion is further promoted by the large number of micro-cracks in the fracture surfaces induced during the previous five shear tests，which in turn degrades the mechanical properties of fracture asperities. Because the latter mechanism is dominant，rock fractures exhibit weakening effects after acid immersion treatment.

Key words： rock mechanics hot dry rock hydraulic fracturing acid corrosion rock fracture shear behavior damage volume

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	Articles by authors
	ZHANG Chongyuan1
	2
	DOU Zihao3
	ZHOU Lunshi4
	LI Jinjin5
	ZHAO Zhihong3
	LI Jianfeng5
	CHEN Jinfan3
	ZHANG Shian1
	ZHAO Xingguang6

Cite this article:

ZHANG Chongyuan1,2,DOU Zihao3, et al. Effect of acid corrosion on shear behaviors of rock fractures[J]. , 2023, 42(S1): 3256-3265.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0588 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3256

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