考虑锚杆强度的加锚岩体结构面锚固效应试验研究  

Experimental study on bolting effects of bolted joint rock masses considering strength of bolts

作　　者：刘广建 裘伟奇 杜程 罗战友 杨彪 王旭虹 王志成 周浩 陈曦 LIU Guangjian;QIU Weiqi;DU Cheng;LUO Zhanyou;YANG Biao;WANG Xuhong;WANG Zhicheng;ZHOU Hao;CHEN Xi(Institute of Rock Mechanics,Ningbo University,Ningbo 315000,China;Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province,Shaoxing University,Shaoxing 312000,China;School of Resources and Safety Engineering,University of Science and Technology Beijing,Beijing 100083 China;Ningbo Urban Rail Investment and Development Co.,Ltd.,Ningbo 315000 China)

机构地区：[1]宁波大学岩石力学研究所,浙江宁波315000 [2]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313000 [3]北京科技大学资源与安全工程学院,北京100083 [4]宁波市市域铁路投资发展有限公司,浙江宁波315000

出　　处：《岩土工程学报》2025年第3期580-588,共9页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(42107177,42277147)。

摘　　要：锚杆强度主要受其直径和材料(抗拉强度)的影响,锚杆强度的大小对提高加锚岩体结构面抗剪力至关重要。开展了加锚结构面剪切试验,研究了锚杆强度对加锚结构面剪切变形特征及锚固效应的影响,提出了考虑锚杆强度的加锚结构面抗剪力计算模型,分析了不同锚杆强度下锚杆轴力与剪力对结构面抗剪力贡献情况。研究表明:(1)随着锚杆直径的增加,加锚结构面峰值抗剪力呈线性增长趋势;锚杆直径超过一定临界值后才会发挥锚固作用,锚杆抗拉强度越大临界值越小。(2)随着锚杆直径和抗拉强度的增大,锚杆塑性铰外移,变形段长度增加,锚杆抵抗变形破坏的能力增强,对结构面抗剪力的提升增强。(3)加锚结构面剪切过程可分为弹性、屈服、强化和残余4个阶段。弹性和屈服阶段,锚杆主要发挥销钉作用,锚杆的贡献与锚杆抗拉强度呈正相关,与锚杆直径的关系受到锚固剂厚度影响;强化阶段,锚杆形成塑性铰,锚杆的贡献由锚杆抗剪力和轴力共同提供,与锚杆抗拉强度和直径呈正相关;残余阶段,锚杆断裂不提供抗剪力。(4)基于锚杆大变形理论,提出考虑锚杆强度的加锚结构面抗剪力模型,分析可知随着锚杆直径和抗拉强度的增加,锚杆轴力贡献占比不断增加,锚杆剪力贡献占比不断减小。The strength of bolts is mainly affected by their diameter and materials(tensile strength).It is very important to improve the shear resistance of bolted joint rock masses.The shear tests on bolted joint are carried out.The influences of the strength of bolts on the shear deformation characteristics and bolting effects of bolted joint are studied.A model for calculating the shear resistance of bolted joint considering the strength of bolts is proposed,and the contribution of axial force and shear force of bolts to the shear resistance of joints under different strengths of bolts is analyzed.The results show that:(1)With the increase of the bolt diameter,the peak shear resistance of the bolted joint increases linearly.When the bolt diameter exceeds a certain critical value,it will play a bolting role.The greater the tensile strength of the bolts,the smaller the critical value.(2)With the increase of the diameter and tensile strength of the bolts,the plastic hinge of the bolts moves outward,the length of the deformation section increases,the capability of the bolts to resist deformation and failure is enhanced,and the shear resistance of the joints is enhanced.(3)The shear process of jointed joint can be divided into four stages:elastic,yielding,strengthening and residual stages.At the elastic and yielding stages,the bolts mainly play the role of pins.Their contribution is positively correlated with their tensile strength,and the relationship with the bolt diameter is affected by the thickness of the anchoring agent.At the strengthening stage,the bolts form a plastic hinge,and their contribution is provided by their shear resistance and axial force,which is positively correlated with the tensile strength and bolt diameter.At the residual stage,the fracture of the bolts does not provide shear resistance.(4)Based on the large deformation theory of the bolts,the anti-shear force model for bolted joint considering the strength of the bolts is proposed.The analysis shows that with the increase of the bolt diameter and t

关 键 词：加锚结构面 锚固效应 抗剪力模型 锚杆直径 抗拉强度 

分 类 号：TU91[建筑科学—建筑理论]