Experimental Researches on Hydro-Mechanical Properties of Altered Rock Under Confining Pressures
Experimental Researches on Hydro-Mechanical Properties of Altered Rock Under Confining Pressures
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围压作用下蚀变岩水力学特性试验研究
DOI：
10.1007/s00603-013-0439-y
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发表时间：
2014-03
影响因子：
6.2
通讯作者：
Shao, J. F.
中科院分区：
文献类型：
--
作者：
Wang, H. L.;Xu, W. Y.;Shao, J. F.
蚀变岩作为中国小湾水电站的坝肩材料，是一种地质缺陷岩体。它结构松散，强度低，有一定的气孔和空洞发育。蚀变岩石的水-力耦合研究对水电工程具有重要意义。本研究采用先进的全自动三轴流体流动-流变试验伺服系统研究蚀变岩石的水-力耦合特性，并设置室内试验中的水压力和围压，模拟小湾水电站的开挖和蓄水条件。根据试验结果，研究了岩石试件在完全流固耦合作用下的应力-应变规律，以及岩石试件的侧向应变和体积应变特性。分析了岩石试件的流体流动规律以及围压对流体流动的影响。讨论了完全流固耦合作用下的流体流动破坏特征。研究成果表明，随着应力状态的变化，岩石的渗透率也会发生变化，渗透率在应力应变过程中的演化呈现出阶段性特征。围压对蚀变岩石的强度、变形和渗透性的影响是明显的。岩石试件在耦合作用下的破坏行为与围压有关，包括劈裂破坏和剪切破坏两种。岩石试件的流体流动破坏特征取决于微裂纹的萌生、扩展和结合、非均质性、围压和岩石的性质。
Altered rock, as the abutment materials of Xiaowan Hydropower Station in China, is a kind of geological defective rock mass. It is loosely structured and its strength is low, with some development of pores and cavities. Research on the hydro-mechanical coupling of the altered rock are of important significance to hydropower projects. In this study, the advanced fully automatic triaxial fluid flow-rheological test servo system is employed to study the hydro-mechanical coupling characteristics of the altered rock, and the water pressures and confining pressures in the laboratory tests are set to simulate the conditions of excavation and impoundment of Xiaowan Hydropower Station. Based on the test results, the stress–strain laws of the rock specimens under the effect of complete hydro-mechanical coupling, as well as the lateral strain and volumetric strain characteristics, are studied. The fluid flow laws of the rock specimens and the effects of the confining pressures on the fluid flow are analyzed. The fluid flow failure characteristic under the effect of the complete hydro-mechanical coupling is discussed. The research achievements show that with the change of the stress states, the permeability of the rock also changes, and the permeability evolution shows the phase characteristic during the process of stress and strain. The impacts of the confining pressures on the strength and deformation and permeability of the altered rock are obvious. The failure behaviours of the rock specimens under the effect of coupling relates to the confining pressures, including two kinds of splitting failure and shear failure. The fluid flow failure characteristic of the rock specimens depend upon the initiation, growth and coalesce of micro-cracks, heterogeneity, confining pressures and properties of the rock.
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影响因子：
2.4
作者：
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通讯作者：
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DOI：
10.1002/(sici)1096-9853(199902)23:2
发表时间：
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影响因子：
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影响因子：
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作者：
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DOI：
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发表时间：
2010-12-01
影响因子：
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作者：
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通讯作者：
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