干湿循环与动态压缩耦合作用下砂岩力学特性的试验研究

doi:10.13722/j.cnki.jrme.2022.0511

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Abstract In the process of reservoir construction and management，the rock would be under an alternating state of drying-wetting owing to the seasonal rainfall and storage and drainage of the reservoir. In addition，the rock is commonly subjected to dynamic loadings such as earthquake，blasting，and tunneling，which have significant influences on the stability of the reservoir. To investigate the effect of drying-wetting cycles and dynamic compression on the mechanical behaviors of rocks，the dynamic test of sandstone undergoing different drying-wetting cycles was carried out using the split Hopkinson pressure bar system. The influences of wetting and drying cycle conditions on the rock dynamic characteristics，energy dissipation law，and fractal dimension of fragmentation were systematically analyzed. The microstructure of sandstone was observed using the scanning electron microscope to reveal the physical deterioration mechanism. The results show that drying-wetting cycles would weaken the ultrasonic characteristics，static and dynamic mechanical characteristics of sandstone. With the increase of drying-wetting cycles，the static uniaxial compressive strength，elastic modulus，P-wave velocity，dynamic compressive strength，dynamic elastic modulus，and dissipative energy of sandstone decrease，while the fractal dimension of rock fragmentation increases. In addition，with increasing strain rate，the dynamic compressive strength，elastic modulus，peak strain，dissipative energy，and fragmentation fractal dimension of sandstone show an increasing trend. The macroscopic analysis results illustrate that the deterioration of sandstone under drying-wetting cycles is caused by the significant change in microstructures，i.e.，pores increasing，particle breakage，cementation weakening，and crack spacing expanding. The research findings in this study could provide a theoretical basis for the design and construction of reservoir de-risking and reinforcement under drying-wetting cycles.

Key words： rock mechanics drying-wetting cycles rock dynamic energy dissipation fragmentation degree degradation mechanism

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	Articles by authors
	ZHU Jianbo1
	2
	FU Yizi1
	LI Rui1
	LIAO Zhiyi3
	SUN Ce4
	TANG Weixiong5

Cite this article:

ZHU Jianbo1,2,FU Yizi1, et al. Experimental study on mechanical characteristics of sandstone under drying-wetting cycles and dynamic compression[J]. , 2023, 42(S1): 3558-3566.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0511 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3558

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