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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摘要

为研究粗糙岩石裂隙的有效应力规律，首先建立裂隙凸起–空腔水压的概念模型，在此基础上，通过应力平衡分析得到相应的有效应力系数a，之后结合单裂隙砂岩水力渗透试验结果，分析围压和裂隙水压p对系数a的影响关系，进而建立新的粗糙裂隙有效应力模型，并对传统模型的适用性进行讨论。研究结果表明：裂隙连通空腔率可用于表征粗糙裂隙的有效应力系数a，其也可从机制上解释粗糙裂隙水力耦合特性的变化；系数a随围压增长呈负指数型减小，而随水压p增大呈指数型增大，三者满足经验关系；当传统有效应力系数a = 1时，传统和新建有效应力模型的计算值在低围压时吻合度较好，但随着围压增大，两者的差距会增大，但差距随水压变化不明显；当传统有效应力系数a = 0.5时，两模型计算值在高水压时差异较大，这是由于高水压会造成连通空腔增大，而系数取0.5会低估裂隙水压的影响作用。此外，传统有效应力模型的适用性可用临界围压值和临界裂隙水压值来判别，其中临界围压值大小与裂隙有效应力系数对围压的敏感性有关，敏感性强的临界围压值越小；而临界裂隙水压值则与围压呈线性增长规律。

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	陈跃都1
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	梁卫国1
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	杨健锋1
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	廉浩杰1
	肖宁1
	2

关键词 ：岩石力学, 粗糙裂隙, 有效应力系数, 裂隙连通空腔, 裂隙水压

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

引用本文:

陈跃都1，2，3，梁卫国1，2，杨健锋1，2，廉浩杰1，肖宁1，2. 含水压粗糙岩石裂隙有效应力规律研究[J]. 岩石力学与工程学报, 2018, 37(S2): 3850-3860.
CHEN Yuedu1，2，3，LIANG Weiguo1，2，YANG Jianfeng1，2，LIAN Haojie1，XIAO Ning1，2. Study on the effective stress characteristic of rough rock fractures with water pressure. , 2018, 37(S2): 3850-3860.

链接本文:

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

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