煤体瓦斯吸附解吸与压裂渗流全过程真三轴试验系统研发与应用

doi:10.13722/j.cnki.jrme.2021.1144

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Abstract The permeability of coal seam in most mining areas in China is low. Fracturing is currently one of the effective methods for enhancing the permeability of coal seams，which can strengthen the effect of coal seam gas desorption and seepage. In order to further study coal seam gas adsorption，desorption and seepage characteristics before and after fracturing，a true triaxial test system for the whole process of gas adsorption-desorption，fracturing，and seepage in coal was independently developed. Gas adsorption，desorption，seepage，and hydraulic fracturing test were conducted under true axial stress. The test system was mainly composed of high-pressure chamber，stress loading-control system，gas injection-adsorption-desorption system，fracturing system，test system，and data acquisition-control system，et al. The sample size was 300 mm×300 mm×300 mm，the maximum loading stress was 30 MPa，the maximum gas injection pressure was 20 MPa，and the pressure endurance of the hydraulic fracturing system was lower than 80 MPa. The main material of the sealed high-pressure chamber was 42CrMo forged steel，which has high safety and sealing performance. The results showed that the maximum adsorption amount of gas in triaxially stressed coal( = 10 MPa， = 8 MPa and = 6 MPa) was approximately 6.50 cm3/g，the maximum strain of coal in the maximum principal stress( ) direction was 4.48×10－3，that in the intermediate stress( ) direction was 4.90×10－3，the adsorption and deformation characteristics both were in accordance with the Langmuir-type change law. The cumulative desorption amount of gas in coal increased exponentially with the time during the desorption process. The desorption velocity of gas in coal showed an exponential decay trend with time，and the residual deformation in the maximum principal stress direction of coal was smaller than that in the intermediate stress direction. Coal was fractured along the maximum principal stress direction under hydraulic fracturing，and the maximum initiation pressure was 15.31 MPa. The permeability of coal before fracturing was from 0.005×10－15 to 0.023×10－15 m2，and it was from 0.028×10－15 to 0.163×10－15 m2 after fracturing，an increase of 4.34–6.06 times. The permeability of coal had a negative exponential relationship with effective stress. This system can provide a certain experimental basis for coal seam gas drainage，fracturing and permeability enhancement technology.

Key words： mining engineering test system development true triaxial stress adsorption-desorption and deformation hydraulic fracturing permeability

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	LIN Haifei1
	2
	LONG Hang1
	LI Shugang1
	2
	ZHAO Pengxiang1
	2
	YAN Min1
	2
	BAI Yang1
	XIAO Tong1
	QIN Aoli1

Cite this article:

LIN Haifei1,2,LONG Hang1, et al. Development and application of true triaxial test system for the whole process of gas adsorption-desorption，fracturing and seepage in coal[J]. , 2022, 41(S2): 3294-3305.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.1144 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3294

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