含贯通节理岩体锚固界面应力分布规律分析  

Analysis of Stress Distribution Law of Anchoring Interface of Rock Mass

作　　者：宋洋 王贺平 常泳涛 李永启 SONG Yang;WANG Heping;CHANG Yongtao;LI Yongqi(College of Architecture and Transportation,Liaoning Technical University,Fuxin 123000,China;Civil Engineering College,Liaoning Technical University,Fuxin 123000,China)

机构地区：[1]辽宁工程技术大学建筑与交通学院,辽宁阜新123000 [2]辽宁工程技术大学土木工程学院,辽宁阜新123000

出　　处：《防灾减灾工程学报》2020年第3期387-394,共8页Journal of Disaster Prevention and Mitigation Engineering

基　　金：国家自然基金项目(5150412,51174268);辽宁省教育厅一般项目(LJYL057)资助。

摘　　要：在拉拔条件下,对全长注浆锚杆在含贯通节理岩体中界面应力分布规律进行分析研究。修订了无节理岩体界面剪应力分布函数,确定了一定条件下修订系数的取值,定义了应力传递参数C,采用有限差分软件Flac3d分析了其影响因子c、φ、ψ、β的影响作用。确定了主影响因子锚固角β,并且在修订公式中加入了锚固角β因子。分析了不同锚固角度下浆-岩界面剪应力的分布规律。结果表明,在带肋钢筋肋间处产生应力集中现象,注浆体起到了均化作用。在拉拔条件下含贯通节理岩体主要在锚端与节理面附近发生应力集中现象。上下部岩体浆-岩界面剪应力呈双曲线形式分布。浆-岩界面剪应力随着锚固角β减小,呈先减小后增大趋势。意味着当锚杆锚固角度在60°附近时,对岩体的锚固效果最好。Considering the pullout conditions,the stress distribution law of the interface between the full-length grouted rock bolt and rock mass with penetrating joints is analyzed. The interface shear stress distribution function of rock mass without joints is modified.. The value of the correction factor under certain conditions is determined. The stress transfer parameter C is defined and the finite difference software Flac3 dis used to analyze the influence of its influence factors c、φ、ψ、β. The main influence factor anchor angle β is determined and the anchoring angle factor β is added to the modified formula. The distribution of shear stress at the pulp-rock interface under different anchorage angles is analyzed. The results show that stress concentration occurs in the ribbed steel bars,and the grouting body plays a homogenization role. Under the pullout condition,the stress-concentrated phenomenon occurs mainly in the vicinity of the anchor end and the joint surface. The shear stress of the upper and lower rock mass at the slurry-rock interface follows the hyperbolic distribution. The shear stress of the slurryrock interface decreases with the anchoring angle β and decreases first and then increases. It means that when the inclination of the anchor is around 60°,the anchoring effect on the rock mass is the best.

关 键 词：贯通节理岩体 界面剪应力 锚固角度 应力传递参数 

分 类 号：U455.7+1[建筑科学—桥梁与隧道工程]