陈世江, 杨志东, 王超, 刘溪鸽. 2019: 基于改进投影覆盖法结构面粗糙度尺寸效应分析. 工程地质学报, 27(6): 1244-1252. DOI: 10.13544/j.cnki.jeg.2018-451
    引用本文: 陈世江, 杨志东, 王超, 刘溪鸽. 2019: 基于改进投影覆盖法结构面粗糙度尺寸效应分析. 工程地质学报, 27(6): 1244-1252. DOI: 10.13544/j.cnki.jeg.2018-451
    CHEN Shijiang, YANG Zhidong, WANG Chao, LIU Xige. 2019: ANALYSIS OF SIZE EFFECT OF STRUCTURAL SURFACE ROUGHNESS BASED ON IMPROVED PROJECTIVE COVERING METHOD. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1244-1252. DOI: 10.13544/j.cnki.jeg.2018-451
    Citation: CHEN Shijiang, YANG Zhidong, WANG Chao, LIU Xige. 2019: ANALYSIS OF SIZE EFFECT OF STRUCTURAL SURFACE ROUGHNESS BASED ON IMPROVED PROJECTIVE COVERING METHOD. JOURNAL OF ENGINEERING GEOLOGY, 27(6): 1244-1252. DOI: 10.13544/j.cnki.jeg.2018-451

    基于改进投影覆盖法结构面粗糙度尺寸效应分析

    ANALYSIS OF SIZE EFFECT OF STRUCTURAL SURFACE ROUGHNESS BASED ON IMPROVED PROJECTIVE COVERING METHOD

    • 摘要: 研究结构面粗糙度的尺寸效应特征对全面理解结构面的力学性质有重要的意义。基于此,将随机数应用于投影覆盖法中,改进了投影覆盖法计算结构面分维数时三角形单元划分方法;在分辨率相同情况下,应用改进投影覆盖法计算了两个形貌特征不同的结构面(2 m×2 m)尺寸大小不同时的分维数;探讨了用取自不同区域位置相同尺寸结构面的最大分维数差值来判定结构面合理尺寸的方法。研究结果表明:(1)形貌特征不同的结构面尺寸效应特征不尽相同,一般情况下,随尺寸增大,结构面粗糙度先增大而后减小,即在小尺寸时表现为正尺寸效应,而后为负尺寸效应;(2)对于某一特定结构面,不同尺寸范围选取位置不同,其尺寸效应特征也不尽相同;(3)不同区域位置相同尺寸结构面最大分维数差值随尺寸的增大,其总体趋势为先减小而后逐渐趋于稳定。该研究结果是全面认识结构面粗糙度尺寸效应的有益补充,为确定结构面合理尺寸提供一条新途径。

       

      Abstract: The surface roughness is one of the important factors in the mechanical properties. And,more significantly,the surface roughness has size effect characteristics. So,investigation of size effect characteristics of surface roughness is of great significance for further understanding of mechanical properties of structural surface. In view of this,firstly,we improve the Projective Covering Method by a new calculation that the random number is applied to the triangular element division. Secondly,to investigate the size effect of surface roughness of rock joints,we select six sampling windows,respectively,from the central and four corners part of structural planes(2 m×2 m). The sampling windows range from 62.5 mm×62.5 mm to 2000 mm×2000 mm. And then,we calculate fractal parameters of the different size surfaces using the improved projective covering method at the same resolution. Thirdly,we discuss the method of determining the reasonable structural surface by the parameter ΔDmaxSD. This parameter is the difference of the maximum fractal dimensions of the same size structural surfaces in different regions. The results show that:(1) The size effect of structure surface is different with different morphological surface. Generally,as the size increases,the roughness of structure surface increases and then decreases. There is positive size effect in small scale and negative size effect in large scale. (2) For a certain structural surface,when the same size surfaces are selected from different locations of the structural planes,and the size effect characteristics are also different. (3) As the size of the structure surface increases,the parameter ΔDmaxSD gradually decreases and tends to almost constant. The result of this study is a useful supplement to the comprehensive understanding of the size effect of structural surface roughness.

       

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