全长灌浆锚固系统失效模式分析

刘秀军; 付文光

doi:10.20265/j.cnki.issn.1007-2993.2024-0227

全长灌浆锚固系统失效模式分析

doi: 10.20265/j.cnki.issn.1007-2993.2024-0227

刘秀军^{1, 2,},
付文光³

1.
中国矿业大学深部岩土力学与地下工程国家重点实验室，江苏徐州　221116
2.
深圳市勘察测绘院（集团）有限公司，广东深圳　518028
3.
深圳市工勘岩土集团有限公司，广东深圳　518063

详细信息

作者简介:
刘秀军，男，1983年生，博士，正高级工程师，注册土木工程师（岩土），主要从事岩土工程检测等方面的研究工作。E-mail：liuxiujun01@163.com

中图分类号: TU470
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- 文章访问数: 18
- HTML全文浏览量: 5
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2024-05-24
- 修回日期: 2024-07-29
- 录用日期: 2024-10-29
- 刊出日期: 2025-06-09

Failure mode analysis of fully grouted anchorage system

Liu Xiujun^{1, 2
,},
Fu Wenguang³

1.
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
2.
Shenzhen Geotechnical Investigation & Surveying Institute (Group) Co., Ltd., Shenzhen 518028, Guangdong, China
3.
Shenzhen GongKan Geotechnical Group Co., Ltd., Shenzhen 518063, Guangdong, China

摘要

摘要: 随着岩土锚固技术的飞速发展，灌浆锚固技术因其低成本且安装方便等优势在锚固工程中得到了广泛应用。以往有关灌浆锚固系统的研究工作侧重于锚固系统承载性能的研究，对锚固系统的失效模式的研究还不够深入。基于此，开展了以下工作：（1）对全长灌浆锚固系统进行重新定义；（2）分析了全长灌浆锚固系统的锚固作用机制；（3）梳理出了全长灌浆锚固系统的8种失效模式，并分析了各失效模式的产生原因；（4）分析了全长灌浆锚固系统两个锚固界面在5种不同解耦状态下灌浆体的应变分布规律，从而提出通过监测灌浆体应变分布曲线来反分析其锚固界面解耦状态的思路；（5）对“深坪锚索综合试验项目”的全长灌浆试验锚索进行了失效模式分析，结果表明：全长灌浆锚固系统的失效更多情况下是几种失效模式的组合或综合作用的结果，其在被拔出过程中两个锚固界面均会发生不同程度的解耦现象，但会有一个薄弱锚固界面。
- 全长灌浆锚固系统 /
- 失效模式 /
- 锚固界面 /
- 解耦状态 /
- 拉拔试验
Abstract: With the rapid development of geotechnical anchoring technology, grouting anchoring technology has been widely used in anchoring engineering due to its advantages of low cost and easy installation. Previous research on grouted anchorage systems has focused on the load-bearing performance of the anchorage system, and the study of the failure modes of the anchorage system is not yet sufficient. The following research tasks were systematically conducted. (1) A refined definition of fully grouted anchorage systems was proposed. (2) The anchorage mechanism of the fully grouted anchorage system was analyzed. (3) Eight failure modes of the fully grouted anchorage system were identified, and the causes of each failure mode were analyzed. (4) The strain distribution law of the grout of the fully grouted anchorage system under five different decoupling states of the two anchorage interfaces was analyzed, and the idea of analyzing the decoupling state of the anchorage interface by monitoring the strain distribution curve of the grout was proposed. (5) A failure mode analysis was conducted on the fully grouted test anchor of the Shenping Anchor Cable Comprehensive Test Project. The results show that the failure of the fully grouted anchorage system is often the result of a combination or comprehensive effect of several failure modes. During the pull-out process, both anchorage interfaces will experience varying degrees of decoupling, while there will be a weak anchorage interface.
- fully grouted anchorage system /
- failure mode /
- anchorage interface /
- decoupling state /
- pullout test

HTML全文

图 1 全长灌浆锚固系统示意图

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图 2 全长灌浆锚固系统锚固作用机制示意图

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图 3 全长灌浆锚固系统失效模式示意图

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图 4 分布式光纤布设示意图

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图 5 锚固界面不同解耦状态下分布式光纤监测到的灌浆体应变分布曲线

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图 6 试验现场

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图 7 A型试验锚索开挖检验照片

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图 8 A12-a^#锚索不同张拉荷载下的光纤应变分布

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图 9 A18-d^#锚索不同张拉荷载下的光纤应变分布

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图 10 A9-c^#锚索卸载前后的光纤应变分布

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