注浆锚杆界面应力分析及临界锚固长度计算  

Analysis of Interface Stress of Grouting Rockbolt and Calculation of Critical Anchorage Length

作　　者：张耀升 王连广[1] 黄小斌 陈百玲[1] ZHANG Yao-sheng;WANG Lian-guang;HUANG Xiao-bin;CHENG Bai-ling(School of Resources&Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2021年第11期1618-1624,共7页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金青年基金资助项目(51808100).

摘　　要：为了明确注浆岩锚在半无限锚固长度下的受力机理,分析了锚杆界面的受力关系,给出相应的锚杆拔出方程.然后假定锚杆弹性部分沿锚固深度方向的剪应力分布呈四分之一椭圆弧,进而给出了注浆锚杆临界锚固长度的计算公式.对4根锚固长度分别为6.0 m和8.5 m的锚杆进行了原位拉拔试验,以验证所给公式的正确性.结果表明,计算得到的轴向应变分布曲线与试验结果一致,轴向应变随着锚固深度的增加呈非线性减小.计算得到的临界锚固长度为5.3 m,与试验结果相差3.6%.最后,通过与前人研究进行比较后发现,本文所给公式具有一般性,且通过本文所给公式计算得到的结果相对保守.To clarify the mechanism of the grouting rockbolt with a semi-infinite anchorage length,the interface mechanical property of the rockbolt was analyzed and the corresponding pull-out equations were present.Assuming that the shear stress distribution of the elastic part of the anchor rod along the anchoring depth was a quarter elliptical arc,and then the calculation formula of the critical anchorage length of the grouting rockbolt was given.To verify the correctness of the present method,in-situ pull-out tests were carried out on 4 anchor rods with anchoring lengths of 6.0 m and 8.5 m,respectively.The results showed that the axial strain distribution curve calculated by the present method was consistent with the experimental results,and the axial strain decreases nonlinearly with the anchoring depth.The critical anchorage length calculated by the present method was 5.3 m,which was 3.6%different from the test result.The method presented in the manuscript was universal,and the calculation results obtained by the present method were relatively conservative compared with the results obtained by previous research.

关 键 词：岩石锚杆 注浆 界面应力 临界锚固长度 拔出试验 

分 类 号：TG335.58[金属学及工艺—金属压力加工]