基于Barton标准剖面线精细数字化处理的岩石节理JRC计算新公式研究  

Study on a new equation for calculating JRC based on fine digitization of standard profiles proposed by Barton

作　　者：李锐 肖维民 LI Rui;XIAO Weimin(School of Civil Engineering, Siehuan Agricultural University, Dujiangyan, Sichuan 611830, China;Siehuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Dujiangyan, Siehuan 611830, China)

机构地区：[1]四川农业大学土木工程学院,四川都江堰611830 [2]村镇建设防灾减灾四川省高等学校工程研究中心,四川都江堰611830

出　　处：《岩石力学与工程学报》2018年第A01期3515-3522,共8页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(41502242);四川省教育厅科研创新团队项目(16TD0006);四川省教育厅青年基金(16ZB0054)~~

摘　　要：以Barton提出的10条标准剖面线为研究对象,首先采用PHOTOSHOP和MATLAB图形处理专业软件对10条标准剖面线进行去杂点、补断口等精细数字化处理,获得更为准确的坐标数据,在此基础上计算标准剖面线在不同取样间距下的坡度均方根Z2和振幅参数hA,并建立节理表面粗糙度系数JRC与Z2和hA之间的经验关系式;然后以Barton标准剖面线和天然岩石节理剖面线为对象,采用该计算公式与其他常用经验公式计算相应的JRC值,并将计算值与剖面线真实值进行比较,结果表明:与其他常用经验公式相比,新公式计算结果精确度更高,具有较好的工程应用前景。Taking ten standard joint profiles proposed by Barton as an object,professional image processing softwares PHOTOSHOP and MATLAB were firstly used to digitize the image of ten standard JRC profiles by removing stray dots located close to the profiles and interpolating pixels between discontinuities in the profiles,then accurate coordinates data of ten standard joint profiles were obtained. On this basis,the root mean square of slope Z2 and amplitude parameter hA of the standard profiles were calculated at different sampling intervals,and a new empirical equation between JRC and Z2 and hA was established. Then the new equation,as well as other commonly-used empirical equations,were employed to calculate the JRC values of ten standard profiles and some natural rock joint profiles. The predictions of JRC were compared with the back-analysis values from shear tests,from which it can be concluded that the prediction accuracy of the new empirical equation is greater than that of the former empirical equations,and it has a good prospect in engineering applications.

关 键 词：岩石力学 岩石节理 标准剖面线 节理表面粗糙度系数(JRC) 数字化 

分 类 号：TU45[建筑科学—岩土工程]