注浆锚杆界面应力分析及临界锚固长度计算

doi:10.12068/j.issn.1005-3026.2021.11.014

东北大学学报（自然科学版） ›› 2021, Vol. 42 ›› Issue (11): 1618-1624.DOI: 10.12068/j.issn.1005-3026.2021.11.014

注浆锚杆界面应力分析及临界锚固长度计算

张耀升，王连广，黄小斌，陈百玲

(东北大学资源与土木工程学院，辽宁沈阳110819)

修回日期:2021-04-28 接受日期:2021-04-28 发布日期:2021-11-19
通讯作者: 张耀升
作者简介:张耀升(1994-)，男，广西南宁人，东北大学博士研究生; 王连广(1964-)，男，辽宁鞍山人，东北大学教授，博士生导师.
基金资助:
国家自然科学基金青年基金资助项目(51808100).

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

ZHANG Yao-sheng， WANG Lian-guang， HUANG Xiao-bin， CHENG Bai-ling

School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China.

Revised:2021-04-28 Accepted:2021-04-28 Published:2021-11-19
Contact: WANG Lian-guang
About author:-
Supported by:
-

摘要/Abstract

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6.0m和8.5m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5.3m，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.

关键词: 岩石锚杆;注浆;界面应力;临界锚固长度;拔出试验

Abstract: 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 6.0m and 8.5m， 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 5.3m， 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.

Key words: rockbolt; grouting; interface stress; critical anchorage length; pull-out test

中图分类号:

TG335.58

张耀升，王连广，黄小斌，陈百玲. 注浆锚杆界面应力分析及临界锚固长度计算[J]. 东北大学学报（自然科学版）, 2021, 42(11): 1618-1624.

ZHANG Yao-sheng， WANG Lian-guang， HUANG Xiao-bin， CHENG Bai-ling. Analysis of Interface Stress of Grouting Rockbolt and Calculation of Critical Anchorage Length[J]. Journal of Northeastern University(Natural Science), 2021, 42(11): 1618-1624.

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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

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