压力型锚杆临界锚固长度的解析解  

Theoretical Solution of Critical Anchorage Length of Pressure Type Anchor

作　　者：刘超[1] 涂兵雄[1] 廖小平 贾金青[3] 蔡燕燕[1] LIU Chao;TU Bingxiong;LIAO Xiaoping;JIA Jinqing;CAI Yanyan(Fujian Engineering Technology Research Center for Tunnel and Underground Space,Huaqiao University,Xiamen 361021,China;Northwest Research Institute Company Limited of China Railway Engineering Corporation,Lanzhou 730000,China;School of Civil Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]华侨大学福建省隧道与城市地下空间工程技术研究中心,福建厦门361021 [2]中铁西北科学研究院有限公司,甘肃兰州730000 [3]大连理工大学土木工程学院,辽宁大连116024

出　　处：《华侨大学学报（自然科学版）》2019年第6期716-723,共8页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(51408242,51678112);中国博士后科学基金资助项目(2016M592082);华侨大学研究生科研创新基金资助项目(17014086017)

摘　　要：考虑压力型锚杆灌浆体因受压产生径向膨胀的影响,对压力型锚杆锚固段进行受力分析,推导其极限抗拔承载力与临界锚固长度的计算公式,并分析灌浆体弹性模量、灌浆体泊松比、岩体弹性模量、钻孔直径及筋体直径等参数对压力型锚杆临界锚固长度和临界长径比的影响.结果表明:极限抗拔承载力随着锚固段长度的增加而增加,达到临界锚固长度后趋于稳定;宜取临界锚固长度理论计算值的65%作为优化的工程临界锚固长度值.Considering the effect of radial expansion of the pressure type anchor grout due to compression, the stress of the anchor bolt was investigated, the calculation formulas of ultimate bearing capacity and critical anchor length were derived. The effects of various parameters on the critical anchorage length and the critical length-to-diameter ratio of the pressure type anchor were analyzed, such as the elastic modulus and Poisson′s ratio of the grout, the elastic modulus of the rock mass, the diameter of the borehole and the diameter of the bolt. The result shows that: as the length of the anchoring section increases, the ultimate resistance capacity increases, and eventually stabilizes after reaching the critical anchorage length. It is proposed that 65% of the theoretical calculation value of the critical anchorage length should be taken as the optimized critical anchorage length in engineering.

关 键 词：压力型锚杆 极限抗拔承载力 临界锚固长度 临界长径比 

分 类 号：TU473.12[建筑科学—结构工程]