岩体节理粗糙度定量化评价新模型  

A new quantitative assessment model for the joint roughness of rock masses

作　　者：陈世江 刘宏伟 李涛[1] 岳虎[1] 刘建刚[1] 余江 CHEN Shijiang;LIU Hongwei;LI Tao;YUE Hu;LIU Jiangang;YU Jiang(School of Mining and Mechanical Engineering,Liupanshui Normal University,Liupanshui 553004,China;School of Civil Engineering,Inner Mongolia University of Science&Technology,Baotou 014010,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]六盘水师范学院矿业与机械工程学院,贵州六盘水553004 [2]内蒙古科技大学土木工程学院,内蒙古包头014010 [3]山东科技大学能源与矿业学院,山东青岛266590

出　　处：《煤田地质与勘探》2025年第3期156-166,共11页Coal Geology & Exploration

基　　金：国家自然科学基金项目(51564038);六盘水师范学院高层次人才引进科研启动专项项目(LPSSYKYJJ202308);内蒙古自治区高等学校科学技术研究项目(NJZY22442);贵州省科学技术基金项目(黔科合基础-ZK〔2022〕一般529);贵州省教育厅基金项目(黔教合KY字〔2020〕050)。

摘　　要：【目的】岩体节理粗糙度对其剪切、渗流等力学性质有重要影响,其精准定量化表征对节理岩体工程实践具有重要意义。目前研究成果表明统计参数中一阶导数均方根与岩体节理粗糙度最具相关性,是表征节理粗糙度的重要方法之一,然而采样间隔严重影响其表征结果。【方法】鉴于此,深入分析一阶导数均方根表征节理粗糙度的缺陷,提出节理轮廓线上参与计算相邻点有效间距,改进采样间隔趋于最小采样精度时考虑坡向一阶导数均方根算法,建立考虑采样间隔改进参数评估节理粗糙度的统一模型;最后通过试验验证所提模型的可靠性。【结果与结论】结果表明:(1)在采样间隔趋于最小采样精度时,改进一阶导数均方根表征节理粗糙度更有效。(2)采样间隔在[2.13 mm,10.1 mm]范围内,不同间隔下38组类岩石节理面4个方向上的粗糙度评估值与实际值平均偏差不超3.0;其中180°方向的标准差低至1.249。(3)构建的节理粗糙度评价新模型初步解决了一阶导数均方根参数表征节理粗糙度受采样间隔严重影响而不便应用的缺陷,为精准量化岩体节理粗糙度提供了一条新途径,该研究方案也为其他统计参数在节理粗糙度精准评估中的普适应用提供参考借鉴。[Objective]The joint roughness of rock masses significantly affects their mechanical properties such as shear strength and permeability.Therefore,its quantitative characterization is significant for the engineering practices of jointed rock masses.Current research achievements indicate that among statistical parameters,the root mean square(RMS)of first derivatives(Z_(2))exhibits the strongest correlation with the joint roughness of rock masses,serving as a vital method for characterizing joint roughness.However,the characterization using this parameter is severely affected by the sampling interval(SI).[Methods]Based on a systematic analysis of the drawbacks of Z_(2) in characterizing the joint roughness,this study proposed the concept of effective spacing between two adjacent calculation points on a joint profile.Accordingly,it improved the RMS algorithm of first derivatives that considers the inclination angle and its direction(Z_(2)^(+))in the case where SI approached the minimum sampling resolution.Then,a unified evaluation model incorporating SI was established.Finally,this study verified the reliability of the model using direct shear tests.[Results and Conclusions]The results indicate that the improved RMS of first derivatives(Z_(2ma)^(+))is more effective in characterizing joint roughness when SI approaches the minimum sampling resolution.Under sampling intervals of[2.13 mm,10.1 mm],38 groups of artificial joint planes exhibited average deviations between estimated and measured roughness values in four directions of 3.0 or less,with those in the direction of 180°of as low as 1.249.The proposed model addresses the limitation of using the RMS of first derivatives for joint roughness characterization,which is highly sensitive to SI and thus has limited applicability,thus providing a novel approach for the precise quantification of joint roughness.The research scheme of this study can also serves as a referential for the widespread application of other statistical parameters to the accurate assessment of join

关 键 词：地质工程 岩体节理 粗糙度 统计参数 统一模型 

分 类 号：TD12[矿业工程—矿山地质测量]