温变条件下石灰岩裂隙渗透特性实验研究

doi:10.13722/j.cnki.jrme.2016.1558

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Abstract Permeability of fracture is sensitive to the dissolution of minerals under the medium temperatures(25 ℃–90 ℃) and osmotic pressures. The flow-through experiments were therefore conducted on the limestone containing a single fracture under 4 different temperatures，25 ℃，50 ℃，70 ℃ and 90 ℃ respectively. The seepage discharge and hydraulic equivalent width of aperture affected by the temperature variation was studied to investigated the permeability characteristics of limestone fracture. During the reaction process，the seepage discharge and the ionic concentration of percolate were measured. The seepage discharge was transformed through the cubic law to obtain the variation of fracture width with time. The experimental results show that the seepage discharge and the hydraulic equivalent width of aperture in the process of temperature rising increase significantly with the time. The hydraulic equivalent width of aperture in the process of constant temperature decreases gradually and finally reaches a stable value. After the increase of osmotic pressure，the width of aperture under the constant effective stress decreases as the increase of temperature. It was found that raising temperature promoted the effect of stress and seepage，and the partial dissolution of seepage channel also changed with the variation of temperature，thus influenced the process of pressure dissolution and free dissolution.

Key words： rock mechanics limestone fracture permeability temperature change hydro-mechanical coupling

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	Articles by authors
	SHENG Jinchang1
	ZHANG Xiaoxiao1
	JIA Chunlan1
	2
	DU Yunchen1
	ZHOU Qing1
	ZAN Meili1
	LOU Yulong1
	HE Shuyuan1

Cite this article:

SHENG Jinchang1,ZHANG Xiaoxiao1,JIA Chunlan1, et al. Experiment study on permeability of limestone fracture under temperature variation[J]. , 2017, 36(8): 1832-1840.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2016.1558 OR http://www.rockmech.org/EN/Y2017/V36/I8/1832

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