文献类型：期刊文献

中文题名：恒定法向刚度条件下吸能锚杆锚固节理岩体剪切特性试验研究

英文题名：Experimental study on shear characteristics of energy-absorbing bolt anchored jointed rock mass under constant normal stiffness condition

作者：韩观胜[1];陈志靖[1];李博[1,2];周宇[1];丁书学[3];钟振[1]

机构：[1]绍兴文理学院浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000;[2]同济大学地下建筑与工程系,上海200092;[3]河南理工大学土木工程学院,河南焦作454003

年份：2024

卷号：43

期号：4

起止页码：999

中文期刊名：岩石力学与工程学报

外文期刊名：Chinese Journal of Rock Mechanics and Engineering

收录：北大核心2023、CSTPCD、、EI(收录号：20242016074837)、Scopus、CSCD2023_2024、北大核心、CSCD

基金：国家自然科学基金资助项目(52204146);浙江省自然科学基金资助项目(LQ21E040003);中国博士后科学基金面上资助项目(2022M712301)。

语种：中文

中文关键词：岩石力学;节理面粗糙度;锚固深度;吸能锚杆;恒定法向刚度;剪切特性

外文关键词：rock mechanics;joint roughness coefficient;anchorage depth;energy-absorbing bolt;constant normal stiffness;shear characteristics

中文摘要：为研究深部岩体工程即恒定法向刚度(CNS)边界条件下吸能锚杆的锚固效果及锚固节理抗剪性能,开展CNS边界条件下吸能锚杆锚固类岩石节理的剪切试验,探究节理面粗糙度(JRC)及锚固深度(h)对类岩石节理剪切应力(τ)、法向位移(δ_(n))、法向应力(σ_(n))、节理面破坏特征、锚杆变形特征的影响规律。结果表明:吸能锚杆可有效提高深部岩体锚固节理的屈服强度及剪切强度,且其提高幅度随着JRC的增大呈现出逐渐增加的趋势,其剪切应力在弹性阶段后产生应力硬化现象。而节理面剪切磨损面积占比随JRC的增加逐渐增大,锚杆的施加使其上涨了20.88%~109.21%。随着锚固深度的增加,节理面的剪切应力、法向位移、法向应力和剪切磨损面积占比均呈现出先增大后减小的趋势,当锚固深度为80 mm时各项指标参数最优,此时锚杆塑性变形段的锚固作用可充分发挥。研究成果为深部节理岩体支护作业的减能增效提供了重要理论支撑。

外文摘要：To explore the shear characteristic of energy-absorbing-bolt anchored rock joints and corresponding bolt performance under constant normal stiffness(CNS)boundary conditions(the condition is associated with deep buried rock mass engineering).We conducted direct shear tests on energy-absorbing bolted rock-like joints.In particular,the tests were performed under diverse joint roughness coefficient(JRC)and anchorage depth(h)to investigate their influence on the deformation characteristics of anchor bolt and mechanical properties of rock joints,such as shear stress(τ),normal displacement(δ_(n)),normal stress(σ_(n))and failure characteristics of joint surfaces.The test results revealed that energy-absorbing bolt effectively enhance the yield strength and shear strength of deep rock joints.The improvement degree progressively increases with a higher JRC value,in which the shear stress first undergoes the elastic period,followed by the stress hardening period.Besides,the shear-induced damage area on the joint surface grows with increased JRC,and it grows by 20.88%–109.21%under energy-absorbing bolt anchored conditions.Moreover,an increase in anchorage depth initially leads to an increase in shear stress,normal displacement,normal stress,and the shear-induced damage area of the joint surface,followed by a subsequent decrease.The optimal values for these properties were observed at an anchorage depth of 80 mm,allowing for the full utilization of the anchorage effect during the plastic deformation stage of the anchor bolt.These findings provide significant theoretical support for reducing cost and improving efficiency in the support of deep rock joints.