二连盆地褐煤断裂行为加载率效应及对压裂裂缝调控的启示

doi:10.13722/j.cnki.jrme.2022.0177

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Abstract The understanding of coal fracture behavior and loading rate effect on the scale of laboratory test is also helpful for the analysis of the fracture propagation law and the regulation of the fracturing fracture formation in the process of underground reservoir fracturing. The fracture behavior and loading rate effect of lignite semi-circular samples taken from Erlian Basin in Inner Mongolia were studied by SHPB test in the direction of bedding parallel，bedding vertical and bedding oblique direction. The results show that the fracture process of lignite samples from Erlian Basin under impact includes elastic deformation，fracture and unloading stages；with the increase of loading rate，the fracture strength and fracture toughness of the samples increase linearly，and the effect of loading rate on the fracture behavior of lignite in the study area is very significant. With the increase of loading rate，the degree of sample breakage intensifies. The bedding parallel type specimens is mainly in the form of bedding shear fracture under impact，and the vertical bedding and oblique bedding specimens are mainly in the form of impact crushing and form a large number of fractures. Coal fines is unfavorable for coalbed methane drainage. The fracture orientation of lignite under impact is basically consistent with the loading direction. Meanwhile，with the increase of the loading rate，the energy dissipation of the lignite fracture process in the study area increases linearly. The above shows that the fault behavior of lignite in Erlian Basin is deeply controlled by the loading rate. Finally，this paper proposes a control program for coal reservoir fracturing mode based on loading rate effect. Among them，the deep stress-controlled lignite reservoir fracturing is mainly used to increase the loading rate step by step from near to far，while the shallow lignite reservoir controlled by natural fractures is fracturing，and the fracturing is from near to far. The pumping procedure of decreasing the loading rate step by step makes the fracturing fractures mainly controlled by stress in the initial stage，and turned into the main control by natural fractures in the later stage. The effect of“staged”fracturing is to form main fractures in the near-wellbore zone，complex fractures in the middle and complex fractures at the far end.

Key words： mining engineering lignite fracture behavior loading rate effect hydraulic fracturing hydraulic fracture optimization Erlian Basin Inner Mongolia

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	Articles by authors
	CHEN Lichao1
	2
	WANG Shengwei2
	3
	ZHANG Diankun2
	LV Shuaifeng3

Cite this article:

CHEN Lichao1,2,WANG Shengwei2, et al. The loading rate effect of lignite fracture behavior in Erlian Basin and its enlightenment on the regulation of fracturing fractures[J]. , 2023, 42(S1): 3169-3177.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0177 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3169

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