含水压粗糙岩石裂隙有效应力规律研究

doi:10.13722/j.cnki.jrme.2018.0622

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Abstract

In order to describe the effective stress characteristics of rough rock fractures，an effective stress coefficientis introduced through the stress balance analysis on the basis of the established asperities-voids-water pressure conceptual model of the rough fracture. Then，the quantitative relationship between the coefficientand the confining stress and water pressure is investigated using the hydraulic test results of two single fractured sandstones. On this basis，a new effective stress model regarding the rough fracture is built，and meanwhile，the applicability of the traditional model is discussed. The results show that the ratio of interconnected voids in the fracture，been assumed as the effective stress coefficient，is capable of describing the variation of hydro-mechanical coupling behaviors of rough fractures well. The empirical model shows a good representation of the changes of the coefficient with the confining stress and the water pressure. Besides，the effective stress values calculated by the new and traditional models，respectively，show a significant difference at high confining stresses and high water pressures. Furthermore，the critical confining stress and water pressure can be used to estimate the applicability of the traditional model. The former is related to the sensitivity of the effective stress coefficient to the confining stress，and the latter linearly increases with confining pressure.

Key words： rock mechanics rough fractures effective stress coefficient interconnected voids of fractures fracture water pressure

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	Articles by authors
	CHEN Yuedu1
	2
	3
	LIANG Weiguo1
	2
	YANG Jianfeng1
	2
	LIAN Haojie1
	XIAO Ning1
	2

Cite this article:

CHEN Yuedu1,2,3, et al. Study on the effective stress characteristic of rough rock fractures with water pressure[J]. , 2018, 37(S2): 3850-3860.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0622 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/IS2/3850

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