Scholarlink

<p>Most natural rock joints are filled with different types of fine-grained materials to form infilled rock joints, of which the normal closure is of great significance for deformation analysis and modelling coupled mechanical-hydraulic processes. However, the normal closure of infilled rock joint has not yet been comprehensively investigated. Therefore, a modified Barton-Bandis normal closure model for infilled rock joints is firstly proposed, where the empirical expressions of the maximum normal closure <i>V</i><sub><i>m</i></sub> and initial normal stiffness <i>K</i><sub><i>ni</i></sub> are deduced based on dimensional analysis theory by considering the effects of infilling ratio Δ and joint surface roughness <i>JRC</i>. Laboratory normal closure tests are carried out on artificial infilled rock joint specimens with the surface roughness identical to the 5th to 10th Barton’s standard profiles to obtain the normal closure curves and corresponding maximum normal closures under different infilling ratios. Then the proposed modified Barton-Bandis model is employed to predict the theoretical normal closure curves, and then compared with experimental results. The comparisons indicate that the theoretical normal closure curves derived from modified Barton-Bandis model match well with experimental curves when Δ ≥ 1.0 regardless of surface roughness, whereas the accuracy of modified Barton-Bandis model depends on joint surface roughness when Δ &lt; 1.0, that is, when the joint surface is rather rough, the theoretical normal closure curves match well with experimental curves under low normal stress while the normal closure will be underestimated under high normal stress. Furthermore, when the joint surface is moderately rough, the modified Barton-Bandis model will overestimate the normal closure, but the error between theoretical and experimental curves decreases with normal stress. The results and findings are expected to be useful and convenient for predicting the normal closure of infilled rock joint, thus providing bases for analyzing the deformation and coupled mechanical-hydraulic properties of rock mass.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

A modified Barton-Bandis normal closure model for infilled rock joint

  • 期刊论文

  • 发表日期：

    2025年7月5日

查看全文
  • Xiao Li,
  • Bin Zhu,
  • Weimin Xiao

摘要

Most natural rock joints are filled with different types of fine-grained materials to form infilled rock joints, of which the normal closure is of great significance for deformation analysis and modelling coupled mechanical-hydraulic processes. However, the normal closure of infilled rock joint has not yet been comprehensively investigated. Therefore, a modified Barton-Bandis normal closure model for infilled rock joints is firstly proposed, where the empirical expressions of the maximum normal closure Vm and initial normal stiffness Kni are deduced based on dimensional analysis theory by considering the effects of infilling ratio Δ and joint surface roughness JRC. Laboratory normal closure tests are carried out on artificial infilled rock joint specimens with the surface roughness identical to the 5th to 10th Barton’s standard profiles to obtain the normal closure curves and corresponding maximum normal closures under different infilling ratios. Then the proposed modified Barton-Bandis model is employed to predict the theoretical normal closure curves, and then compared with experimental results. The comparisons indicate that the theoretical normal closure curves derived from modified Barton-Bandis model match well with experimental curves when Δ ≥ 1.0 regardless of surface roughness, whereas the accuracy of modified Barton-Bandis model depends on joint surface roughness when Δ < 1.0, that is, when the joint surface is rather rough, the theoretical normal closure curves match well with experimental curves under low normal stress while the normal closure will be underestimated under high normal stress. Furthermore, when the joint surface is moderately rough, the modified Barton-Bandis model will overestimate the normal closure, but the error between theoretical and experimental curves decreases with normal stress. The results and findings are expected to be useful and convenient for predicting the normal closure of infilled rock joint, thus providing bases for analyzing the deformation and coupled mechanical-hydraulic properties of rock mass.