温度–应力–渗流耦合条件下红砂岩渗流特性试验研究

doi:10.13722/j.cnki.jrme.2020.0229

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Abstract In order to study the mechanical properties and seepage characteristics of red sandstone under different high temperature environments，seepage tests under hydrostatic pressure conditions and triaxial compression conditions were carried out by using the Rock Top multi-field coupling tester. The results show that，at different temperatures，the pressure difference，the flow rate，and the increase and decrease rates of the seepage flow are consistent with the damage evolution trend，and that the seepage state consists of three stages. Before the damage stress，the rock sample is mainly compressive deformation，the fluid overflows reversely and the seepage process is interrupted. At the initial stage of the unsteady rupture development stage，the flow rate increases sharply while the pressure decreases sharply，accompanied by a first rapid increase，then rapid decrease and finally slow grow of the permeability with a pseudo-peak. The permeability presents a true peak before the residual stress. Within different temperature thresholds，the thermal stress has different effects on red sandstone. The initial，peak and post-peak permeabilities and the strength increase first and then decrease with increasing the temperature. At a certain temperature threshold(between 100 ℃ and 150 ℃)，the development of internal cracks in the rock is mainly controlled by the confining pressure. The permeability of rock samples at different temperatures(100 ℃，50 ℃ and 25 ℃) and different seepage pressure gradients changes with the confining pressure following a power function，and the change trends of the permeability with the pressure obtained by the transient state method and the steady state method are consistent with each other. Under the same seepage pressure gradient，the permeability by the transient state method(10－19 m2) is 2 orders of magnitude higher than that by the steady state method(10－21 m2)，reflecting the regularity of the rock permeability with the temperature and the confining pressure. At the same confining pressure，the higher the temperature，the greater the difference between the permeability values measured by the two methods，and at the same temperature，the steady-state permeability of the rock sample under different seepage pressure gradients is of the same magnitude. Under the high hydrostatic pressure，the influence of the permeability gradient on the permeability is not obvious. The hydrostatic stress is an important reason for the permeability，while The temperature and the seepage pressure gradient on the permeability is limited. Both methods show that red sandstone is a typical low-permeability rock.

Key words： rock mechanics multi-field coupling high temperature permeability hydrostatic pressure

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	ZHANG Peisen1
	2
	ZHAO Chengye1
	2
	HOU Jiqun1
	2
	LI Tenghui1
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	ZHANG Xue1

Cite this article:

ZHANG Peisen1,2,ZHAO Chengye1, et al. Experimental study on seepage characteristics of deep sandstone under temperature-stress-seepage coupling conditions[J]. , 2020, 39(10): 1957-1974.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0229 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I10/1957

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