断裂岩石双翼表面细观接触特征与剪切强度关系

doi:10.13722/j.cnki.jrme.2014.0006

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摘要断裂岩石抗剪强度对自然岩体稳定性预测至关重要，为从细观层面探究断裂岩体双翼粗糙面接触与抗剪强度关系，采用蠕剪实验的方法对压剪和间接拉伸两类断裂岩石的力学行为进行研究。通过对断裂岩石双翼粗糙面的激光扫描图像处理和几何重构，用“切层–小岛法”对双翼啮合时断裂岩石两翼粗糙面的接触状态和接触面积进行了分析。结果表明：压剪形成的断裂岩石在蠕剪过程中双翼粗糙面呈不规则“海岸线式”接触；拉断裂岩石双翼表面呈离散“群岛式”接触。拉破裂岩石双翼接触面积明显大于压剪破裂岩石接触面积。尽管岩石断裂生成机制乃至施加的法向荷载不同，断裂岩石的蠕剪强度与接触面积成正比关系，喻示断裂岩石的双翼表面接触面积是考量断裂岩石表面粗糙性对抗剪强度影响的重要指标。此研究对建立岩石节理的接触力学本构模型和构建抗剪强度准则有所借鉴。

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关键词 ：断裂岩石, 粗糙表面, 细观接触, 剪切强度

Abstract：The shear strength of fractured rocks is of great importance for the stability prediction of rock mass. In order to investigate the relationship of the contact configuration from micro scope of double rough surfaces in contact with the shear strength of fractured rocks，the creep shear tests are carried out for fractured rocks induced by compressive shear and indirect tension. By means of laser scanning image procession and the geometric reconstruction of the double rough surfaces in fractured rocks， and through“slice-island method”，the contact configuration and contact area are analyzed. The study shows that the contact shape displays an irregular“coast line”style for compressive shear fractures and“scattered islands”style for tensile fractures in rocks. The contact area for tensile fractured rocks is significantly greater than that for compressive shear fractured rocks. Although the formation mechanism of the fractured rocks is different，or even the applied normal forces are at different levels，the creep shear strength is directly proportional to the contact area，implying that the contact area can be a candidate index in evaluation of the influence of surface roughness to the shear strength of fractured rocks. The results remain a referential value in construction of the contact constitutive model as well as of shear strength criterion for the fracture rocks.

Key words： Fractured rocks Rough surface Micro-contact Shear strength

收稿日期: 2014-01-06

引用本文:

王金安1，王煜曦1，曹秋菊2. 断裂岩石双翼表面细观接触特征与剪切强度关系[J]. 岩石力学与工程学报, 2015, 34(08): 1522-1531.
WANG Jin?an1，WANG Yuxi1，CAO Qiuju2. THE MICRO-CONTACT CHARACTERISTCS OF DOUBLE ROUGH SURFACES AND THE RELATION TO THE SHEAR STRENGTH OF FRACTURED ROCKS. , 2015, 34(08): 1522-1531.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2014.0006 或 http://www.rockmech.org/CN/Y2015/V34/I08/1522

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