岩体结构面粗糙度各向异性特征及尺寸效应分析

doi:10.13722/j.cnki.jrme.2015.01.007

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摘要岩体结构面形貌存在明显的各向异性和尺寸效应特征。由于结构面本身的复杂性，定量表征其属性仍是该领域的研究难点。鉴于此，考虑岩体结构面的地质本质性特征，应用地质统计学原理，提出采用变异函数参数(基台C和变程 )表示结构面粗糙度(JRCv)的方法；然后采用量纲分析法，给出JRCv表达式。应用提出的公式计算结构面上不同尺寸范围(100 Pixel×100 Pixel～1 000 Pixel×1 000 Pixel) 32个方向上的JRCv值，分析结构面粗糙度各向异性及其尺寸效应特征。研究结果表明：(1) 从表观看，沿分析方向，结构面越粗糙，JRCv值越大，JRCv可以定量表征结构面粗糙度及其各向异性特征；(2) 在结构面分析方向上，随尺寸范围的增大，JRCv值逐渐减小，达到一定范围时，JRCv值趋于稳定，通过分析各方向上JRCv值随尺寸范围的变化趋势，可以确定结构面的临界范围；(3) 结构面各向异性特征受结构面研究范围的影响，当研究范围达到一定尺度时，结构面各向异性特征趋于稳定。该研究成果将为定量分析岩体结构面力学性质强弱方向提供依据，为实验室或原位结构面力学试验选择合理尺寸试件提供一种新方法。

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关键词 ：岩石力学, 岩体结构面, 各向异性, 尺寸效应, 变异函数

Abstract：The roughness of the joint surface of rocks is notably anisotropic and size affected. To describe it quantitatively remains a difficult problem because of the complex structure of joint surface. The method of geological statistics was used to analyze the anisotropy and the size effects of structural surface of rocks. A method based on the dimensional analysis，JRCv，was proposed to describe the surface roughness of joints using the sill value and variable range of the variogram. Ten sampling sizes from 100 Pixel×100 Pixel to 1 000 Pixel×1 000 Pixel were selected from the central part of the surface to calculate JRCv values. It is found that the rougher the surface in analysis direction is，the larger the value of JRCv. JRCv is thus a good parameter to describe the anisotropy and roughness of joint surface of rock. The JRCv values decrease with increase of the size of the sampling windows. When the sampling windows are larger than a threshold value，the estimated parameters remain constant. Anisotropic properties are influenced by the surface size when the sampling windows are smaller than the threshold.

Key words： rock mechanics rock joint surface anisotropy size effects variogram

收稿日期: 2014-04-17

引用本文:

陈世江1，2，朱万成2，刘树新1，张飞1，郭灵飞1. 岩体结构面粗糙度各向异性特征及尺寸效应分析[J]. 岩石力学与工程学报, 2015, 34(01): 57-66.
CHEN Shijiang1，2，ZHU Wancheng2，LIU Shuxin1，ZHANG Fei1，GUO Lingfei1. ANISOTROPY AND SIZE EFFECTS OF SURFACE ROUGHNESS OF ROCK JOINTS. , 2015, 34(01): 57-66.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.01.007 或 http://www.rockmech.org/CN/Y2015/V34/I01/57

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