热–水–力耦合条件下深部砂岩冲击动力学特性试验研究

doi:10.13722/j.cnki.jrme.2020.0205

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Abstract In order to appropriately understand the dynamic mechanical behavior of sandstone sampled by roof cutting non-pillar mining method in deep coal mines under some special conditions including high geo-temperature，high hydraulic pressure and high ground stress，the impact compression test under thermal- hydraulic-mechanical coupling condition is carried out using a self-developed triaxial dynamic impact mechanics testing system. The dynamic stress-strain characteristics and the correlation between the dynamic deformation modulus and the loading rate，as well as the dependence of the peak stress/strain on the loading rate，the axial and confining pressures，the hydraulic pressure，the temperature and the absorption energy， are investigated，and the micromorphology of sandstone fractures after testing is examined by scanning electron microscopy(SEM). The results reveal that both the peak stress and the peak strain of siltstone proportionally increase with increasing the axial pressure，the confining pressure，the hydraulic pressure and temperature，accompanied a tendency from brittleness to ductility，and that the deformation process siltstone can be divided into four stages including compaction deformation，elastic deformation，plastic deformation and failure. With increasing the loading rate，the dynamic deformation modulus gradually increases and then decreases with a critical value of 136 GPa. It is also found that the axial and confining pressures，the hydraulic pressure and the temperature have significant enhancement effect on the mechanical properties of sandstone under dynamic loading. Moreover，the absorption energy of siltstone increases linearly with increasing the peak strain，and the crushing deformation is proportionally correlated with the absorption energy.

Key words： rock mechanics deep sandstone thermal-hydraulic-mechanical coupling dynamic impact non-pillar mining temperature hydraulic pressure confining pressure

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	Articles by authors
	ZOU Baoping1
	2
	LUO Zhanyou1
	XU Fujun3
	DING Haonan1
	TAO Zhigang2
	HE Manchao2

Cite this article:

ZOU Baoping1,2,LUO Zhanyou1, et al. Experimental study on impact dynamic characteristics of deep sandstone under thermal-hydraulic-mechanical coupling conditions[J]. , 2020, 39(9): 1750-1761.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0205 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I9/1750

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