预应力锚索工作应力的检测方法——拉脱法的检测机制和试验研究

›› 2012, Vol. 33 ›› Issue (8): 2247-2252.

预应力锚索工作应力的检测方法——拉脱法的检测机制和试验研究

付丹^{1, 2}，郭红仙¹，程晓辉¹，罗斌³，饶枭宇³

1. 清华大学土木工程系土木工程安全与耐久教育部重点实验室，北京 100084； 2. 中国建筑东北设计研究院有限公司，沈阳 110006；3. 重庆交通科研设计院，重庆 400067

收稿日期:2011-04-13 出版日期:2012-08-10 发布日期:2012-08-13
通讯作者: 郭红仙，女，1967年生，博士，副研究员，主要从事岩土工程方面的教学和研究工作。E-mail: guohx@tsinghua.edu.cn E-mail:fudan627@163.com
作者简介:付丹，女，1985年生，硕士，助理工程师，主要从事岩土工程研究、建筑结构设计方面的研究工作
基金资助:
交通部西部交通建设科技项目(No. 200831800001)

Working stress measurement of prestressed anchor cables: Detection mechanism and experimental study of lift-off test

FU Dan^{1, 2}，GUO Hong-xian¹，CHENG Xiao-hui¹，LUO Bin³，RAO Xiao-yu³

1. Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education Department of Civil Engineering, Tsinghua University, Beijing 100084, China; 2. China Northeast Architectural Design & Research Institute Co., Ltd., Shenyang 110006, China; 3. Chongqing Communications Research and Design Institute, Chongqing 400067, China

Received:2011-04-13 Online:2012-08-10 Published:2012-08-13

摘要/Abstract

摘要： 拉脱法可用于对预应力锚索的工作应力进行检测，它是通过对张拉荷载-锚索伸长量曲线中拐点的判断或对锚具与锚垫板脱开时刻的判断获得预应力锚索工作应力的一种微损检测方法。本文对拉脱法检测预应力锚索工作应力的机制进行力学分析，并对其误差进行理论分析，包括岩土体和锚具回弹、工作锚夹片缩进以及千斤顶滑移等对检测结果的影响。通过对拉脱法的机制分析和检测精度研究，验证了理论分析的正确性，并表明：可通过张拉荷载-位移曲线转折区段的上、下限平均值获得预应力锚索工作应力。当工作荷载为极限荷载的75%时，检测误差约为2%，满足工程检测要求。研究结果为拉脱法在锚索工作应力检测的工程应用推广提供了理论和试验基础。

关键词: 预应力锚索, 工作应力, 拉脱法, 荷载-位移曲线, 岩土锚固

Abstract: The prestressed anchor cables are critical structural elements in ground anchors. Because of the widespread use of ground anchors in geotechnical engineering, the measurement of working stress of prestressed anchor cables in ground anchors becomes imperative. The lift-off test is currently practiced in China and many other countries for this purpose. However, the interpretation methods of testing results are different and country dependent. The interpretation method employed in China is examined by experiment and theoretical analysis that are presented in this paper. The experimental verifications are performed to apply a couple of lift-off tests on a anchor cable prestressed to its 75% ultimate strength. The results show that averaged load in the bending regime on the load-displacement curve recorded during lift-off tests can approximate the working stress of this anchor cable monitored with load cells installed. According to theoretical analysis the measuring principle of list-off tests is better understood.

Key words: prestressed anchor cable, working stress, lift-off test, the load-displacement curve, ground anchor

中图分类号:

TU 45

付丹，郭红仙，程晓辉，罗斌，饶枭宇 . 预应力锚索工作应力的检测方法——拉脱法的检测机制和试验研究[J]. , 2012, 33(8): 2247-2252.

FU Dan ，GUO Hong-xian ，CHENG Xiao-hui ，LUO Bin ，RAO Xiao-yu . Working stress measurement of prestressed anchor cables: Detection mechanism and experimental study of lift-off test[J]. , 2012, 33(8): 2247-2252.

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