摘要
为探究锚杆在不同锚固角度下的受力特征和作用机制,采用Pile单元改进模型建立具有不同锚固角度的锚固结构面数值模型,并开展一系列的单轴压缩数值试验,对锚杆的锚固角度效应进行了系统研究。结果表明:当锚固角较大时,锚固结构面试件加载过程分为4个阶段,而当锚固角较小时仅为3个阶段;随着锚固角的增加,峰值应力整体上先恒定后减小,弹性模量呈非线性降低;锚杆与试件力的相互作用主要分布在结构面与锚杆相交处以及锚杆两端;锚杆的显著变形和受力主要分布在结构面附近,大致为锚杆直径的3~4倍;随着锚固角的增大,锚杆轴力的贡献呈非线性减小,锚杆剪力的贡献呈线性增大,锚杆抗剪力呈非线性减小。
To investigate the force characteristics and action mechanism of bolts under different anchor angles,this paper establishes numerical models of bolted rock joints with different anchor angles based on modified Pile elements and carries out a series of uniaxial compression numerical tests to systematically study the anchor angle effect of bolts.The results show that the loading process of the bolted rock joint is divided into four stages when the anchor angle is large,while it is divided only into three stages when the anchor angle is small.With the increase of the anchor angle,the peak stress as a whole is constant first and then decreases,while the elastic modulus decreases nonlinearly.The interaction of force between the bolt and the specimen is mainly distributed at the intersection of the rock joint and the bolt and at the two ends of the bolt.The prominent deformation and force of the bolt are mainly distributed near the rock joint,roughly 3~4 times of the bolt diameter.With the increase of the anchor angle,the contribution of bolt axial force decreases nonlinearly;the contribution of bolt shear force increases linearly;and the bolt shear resistance also decreases nonlinearly.
作者
左海峰
蒋宇静
李春平
刘光饶
张孙豪
管彦太
栾恒杰
刘建荣
李鑫鹏
ZUO Haifeng;JIANG Yujing;LI Chunping;LIU Guangrao;ZHANG Sunhao;GUAN Yantai;LUAN Hengjie;LIU Jianrong;LI Xinpeng(Academician(Expert)Workstation,Inner Mongolia Shanghaimiao Mining Co.Ltd,Ordos 016299,China;College of Energy and Mining Engineering,Shandong University of Science and Technology,Qingdao 266590,China;Graduate School of Engineering,Nagasaki University,Nagasaki 8528521,Japan)
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2023年第5期30-39,共10页
Journal of Shandong University of Science and Technology(Natural Science)
基金
国家自然科学基金项目(52104093)
山东省中央引导地方科技发展专项资金项目(YDZX2022141)。
