瓮福磷矿穿岩洞矿区矽卡岩不同湿度和应力状态下的力学特征

doi:10.13722/j.cnki.jrme.2021.0267

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Abstract Skarn samples from the Chuanyandong orefield of Wengfu phosphate mine，taken as the research object，were placed in the self-designed device for 49 days with four humidity ratios(70% RH，80% RH，90% RH and 100% RH) and measured at certain intervals for obtaining the porosity，mass and size. Then，uniaxial and triaxial compression tests，electron microscope scanning and X-ray diffraction were subsequently performed to analyze the variations in micro structure，mass loss and corrosion depth. Simultaneously，the response features of the strength，deformation and mechanical parameters were also discussed. The results show that the structural porosity positively relates to the placing time under high-humidity conditions. The dense layered crystal morphology tends to be flocculent，accompanied with the generation of micro fissures，and the width of these fissures increases with time. Higher humidity ratio frequently causes larger variations in porosity，mass and size. The change rate reaches the fastest initially and levels off over time. The uniaxial compressive strength under 100% RH condition decreases by 35%，compared to that of 70% RH condition after the placement for 49 days. Under 90% RH condition，the accumulated decrease ratio of the uniaxial compressive strength is 46%. The decrease ratio slows with time. In addition，the cohesion and the internal frictional angle also decrease with time，while the cohesion is more sensitive to the high-humidity environment than the internal frictional angle. The proposed strength model，considering the corrosion law under high-humidity ratios，agrees well with the laboratory results. The chemical corrosion under high-humidity conditions，involving dissolution，hydration and disintegration，impairs the friction between particles，weakens the mechanical strength，causes the transition from shear failure to tensile failure and finally accelerates the damage of the skarn pillars.

Key words： rock mechanics deep high-humidity environment water-rock interaction aging characteristics corrosion depth strength model mechanical damage mechanism

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	Articles by authors
	CHEN Wei1
	WAN Wen1
	FENG Tao1
	ZHAO Yanlin1
	2
	WU Qiuhong1
	2
	ZHOU Yu1
	XIE Senlin3

Cite this article:

CHEN Wei1,WAN Wen1,FENG Tao1, et al. Mechanical characteristics of skarns from Chuanyandong orefield of Wengfu phosphate mine under various humidity ratios and stress states[J]. , 2021, 40(12): 2510-2525.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0267 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I12/2510

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