文献类型：期刊文献

中文题名：基于概率统计的结构面粗糙度各向异性和尺寸效应分析

英文题名：Anisotropy and Size Effects of Surface Roughness of Rock Joints Based on Mathemarics Statistics

作者：张海鹏[1];杜时贵[1];雍睿[1]

机构：[1]绍兴文理学院土木工程学院

年份：2018

卷号：0

期号：1

起止页码：65

中文期刊名：科技通报

外文期刊名：Bulletin of Science and Technology

收录：CSTPCD

基金：国家自然科学基金项目(41427802);国家自然科学基金项目(41502300);浙江省自然科学基金项目(Q16D020005)

语种：中文

中文关键词：粗糙度系数;岩体结构面;各向异性;尺寸效应

外文关键词：joint roughness coefficient(JRC);rock mass discontinuities;anisotropy;size effect

中文摘要：考虑到岩体结构面的复杂特性,结构面粗糙度的各向异性和尺寸效应规律的定量描述仍是个难点。本文以浙江常山板岩结构面为例,运用三维扫描技术,共获取19636条结构面二维轮廓线。基于简明直边法计算结构面粗糙度系数,通过极坐标图,结合各向异性系数评价指标,综合分析表明,起伏幅度和粗糙度系数存在各向异性,两者各向异性规律相似,发育优势方向基本吻合。根据统计分析结果,建立了尺寸效应百分率评价指标,研究发现起伏幅度和粗糙度系数存在尺寸效应:起伏幅度随尺寸增大而增大,粗糙度系数则相反,粗糙度系数在轮廓线尺寸为L_n=700mm之后达到稳定阈值。该分析结果进一步告知了起伏幅度与粗糙度系数的关系变化,为定量分析岩体结构面力学性质强弱方向提供依据。

外文摘要：The anisotropy and scale effects of joint roughness can not be well described quantitatively,because of the complex characteristics of rock mass discontinuities. As an important parameter to calculate the joint roughness coefficient,the undulation amplitude( R_y ) has not been analyzed and discussed fully. An in-situ rock collected in Changshan County,Zhejiang Province be took as an example in this paper. The surface profile curveswere measured by the 3D laser scanning technology. The calculation of joint roughness coefficient( JRC) of structural surface based on symbol edge method. The anisotropy coefficient was used to evaluate the index. According to the polar plot,the results shows that R_y and JRC exists anisotropy,both anisotropic features are similar,the development direction is basically consistent. By establishing statistical chart and the evaluation index of size effect percentage,the size effect of fluctuation amplitude and roughness coefficient is known. R_y and JRC exist scale effects,undulation amplitude was increased with the increasing of scale,JRC is contrary to R_y . The roughness coefficient reaches a stable threshold after the sample size is L_n= 700 mm. The results tell the relation between fluctuation of amplitude and roughness coefficient,which provides the basis for quantitative analysis of the mechanical properties of rock mass.