基于锈胀开裂的预应力锚杆（索）使用寿命预测研究

邓东平; 李亮; 赵炼恒; 刘剑豪

doi:10.11779/CJGE201408012

基于锈胀开裂的预应力锚杆（索）使用寿命预测研究 English Version

中南大学土木工程学院,湖南长沙 410075

基金项目: 教育部博士研究生学术新人奖项目（114801045）; 湖南省研究生科研创新项目（CX2012B056）; 贵州省交通运输厅科技项目（2010-122-020）

详细信息

作者简介:
邓东平(1985- ),男,湖南岳阳人,博士研究生,主要从事道路与铁道工程方面的工作。E-mail: dengdp851112@126.com。

中图分类号: TU375
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出版历程
- 收稿日期: 2013-09-22
- 发布日期: 2014-08-18

Prediction of service life of pre-stressed anchorage bolt (cable) due to corrosion expansion

College of Civil Engineering, Central South University, Changsha 410075, China

摘要

摘要: 锚杆（索）腐蚀后其体积发生膨胀并形成锈胀力,而锈胀力的增大可导致外围注浆体开裂,从而加速锚杆（索）的腐蚀,故可以此时的锈蚀量作为预测锚杆（索）使用寿命的判别条件。当对外围注浆体进行受力分析时,采用平面应变情况下的圆孔模型弹性理论计算注浆体开裂时的极限锈胀力,并以锚杆（索）与外围注浆体接触面的变形协调条件来计算极限锈胀力时的锚杆（索）锈蚀量。同时,比例参数λ被采用来考虑岩土体对锚固体的约束作用,且将是否考虑注浆体内部裂缝影响作为2种方法计算锈胀力作用下的注浆体变形。然后,将参数选取在一定范围内经曲线拟合得极限锈胀力及对应锚杆（索）锈蚀量的简单表达式,进而根据2种不同适用条件下的锚杆（索）锈蚀速率计算式对锚杆（索）的使用寿命进行预测和分析。经算例对比验证了本文方法的可行性,并对锚杆（索）使用寿命的影响因素进行了参数分析,可知：①不考虑注浆体内部裂缝影响而计算得的锚杆（索）锈蚀量值偏于保守;②外围岩土对注浆体的约束作用对锚杆（索）的使用寿命有积极影响;③铁锈体积膨胀率n对锚杆（索）的使用寿命影响微小,而注浆体泊松比μ_c和保护层厚度c越大则锚杆（索）的使用寿命越长。
- 锚杆（索） /
- 外围注浆体 /
- 锈胀力 /
- 锈蚀量 /
- 锈蚀速率 /
- 使用寿命
Abstract: After it is corroded, the volume of anchorage bolt (cable) expands and corrosion expansion force is generated. With the increase of corrosion expansion force, peripheral grout appears to crack, which accelerates its corrosion, so the corrosion amount at this moment should be taken as the criterion to predict its service life. For analyzing the force of peripheral grout, the elastic theory of hole model under plane strain is adopted to calculate the limit corrosion expansion force at the time of grout cracking, and the deformation compatibility condition of contact surface between anchorage bolt (cable) and peripheral grout is used to calculate its corrosion amount corresponding to the limit corrosion expansion force. Meanwhile, the proportional parameter λ is adopted to consider geotechnical constraints on anchoring body, and two methods (with or without considering effect of internal cracks in grout) are used to calculate deformation of grout generated by corrosion expansion force. Then simple formulas for calculating the limit corrosion expansion force and the amount of its corresponding corrosion are attained after curve fitting in a certain range of parameters, and using two kinds of formulas for calculating corrosion rate of anchorage bolt (cable) under different applicable conditions, the service life of anchorage bolt (cable) can be predicted and analyzed. By comparing with examples, the feasibility of the proposed method is verified, and parameters affecting the service life of anchorage bolt (cable) are analyzed. It shows that: (1) The calculated amount of anchorage corrosion without considering effect of internal cracks in grout is more conservative. (2) The constraint of peripheral geotechnical body on grout has positive impact on the service life of anchorage bolt (cable). (3) The volume expansion rate n of rust has the minimum impact on the service life of anchorage bolt (cable), and the greater the Poisson’s ratio of grout (μ_c) and the thickness of protective layer (c), the longer the service life of anchorage bolt (cable).
- anchorage bolt (cable) /
- peripheral grout /
- corrosion expansion force /
- corrosion amount /
- corrosion rate /
- service life

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