高温与不同水压下深部砂岩渗透特性试验研究

doi:10.13722/j.cnki.jrme.2019.1113

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Abstract The mechanical properties and seepage characteristics of rock are closely related to stress，temperature and osmotic pressure. The Rock Top multi-field coupling tester was used to carry out temperature-stress-seepage coupling experiment of red sandstone under different hydrostatic pressures and seepage pressures at the high temperature of 100 ℃. The results show that，at high temperature，the total stress-strain of red sandstone goes through 5 stages including crack compaction，linear elastic deformation，stable development of microcracks，unsteady fracture development，and post-peak deformation and failure. Corresponding to rock stress-strain curve，the curve of the flow and the deviation stress involves inverse overflow，sharply reverse stable overflow，sharp rise and stable growth sections，and the permeability also show a four-stage behavior of decrease from the initial value，keeping level constant，rapid growth to the pseudo peak and declination，and stable growth to the true peak. The permeability of red sandstone under high temperature and high confining pressure shows an approximate linear decreasing trend with the constant gradient growth of the confining pressure. Under high confining pressure，the effect of the seepage pressure difference on the permeability is not obvious，and the permeability value tends to be stable. Both methods show that red sandstone belongs to typical low-permeability rocks. Under the same confining pressure and seepage pressure difference，the results obtained by the transient method and the steady-state method are similar. Under the confining pressure of 30–60 MPa，pressure condition is the main reason affecting the permeability.

Key words： rock mechanics permeability characteristics hydrostatic pressure high temperature steady state method transient method

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	ZHANG Peisen1
	2
	ZHAO Chengye1
	2
	HOU Jiqun1
	2
	LI Tenghui1
	2

Cite this article:

ZHANG Peisen1,2,ZHAO Chengye1, et al. Experimental study on seepage characteristics of deep sandstone under high temperature and different hydraulic pressures[J]. , 2020, 39(6): 1117-1128.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1113 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I6/1117

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