冻融循环对GFRP锚杆锚固性能影响的试验研究

朴昇昊; 张伟丽; 王永一; 邓黎

doi:10.19509/j.cnki.dzkq.2021.0055

冻融循环对GFRP锚杆锚固性能影响的试验研究

doi: 10.19509/j.cnki.dzkq.2021.0055

中国地质大学(武汉)工程学院, 武汉 430074

基金项目:

国家自然科学基金项目 41302232

中国地质大学(武汉)基础科研训练计划 1910491025

详细信息

作者简介:
朴昇昊(1999-), 男, 主要从事边坡锚固的研究工作。E-mail: 15604330021@163.com

通讯作者:
张伟丽(1974-), 女, 副教授, 主要从事岩土工程和结构工程的教学和科研工作。E-mail: zwl@cug.edu.cn

中图分类号: TU473.1
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- 文章访问数: 627
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- 被引次数: 0
出版历程
- 收稿日期: 2021-05-19

Experimental study on the influence of freeze-thaw cycles on the anchoring performance of GFRP anchor

Faculty of Engineering, China University of Geosciences(Wuhan), Wuhan 430074, China

摘要

摘要:
针对季冻区春融期岩锚失效的问题, 研究了玻璃纤维(GFRP)锚杆在冻融循环作用下的锚固能力。通过设计物理模型对经历25, 50, 75冻融周期的试块进行了加载试验, 根据试验数据和破坏现象分析了GFRP锚杆在冻融后锚杆应力和承载力的变化规律。研究结果表明: 冻融循环会导致环氧树脂砂浆与混凝土的黏结性能下降, 在25, 50, 75周期后承载力损失分别为38.24%, 42.65%, 52.94%。冻融循环加速黏结材料及围岩的材料性能劣化, 荷载向内部传递加速, 使得GFRP锚杆上各点之间的应力差值逐渐减小, 锚杆应力分布比常温状态下更趋于均匀, 但材料性能的劣化导致局部破坏提前, 锚杆整体承载性能降低。研究结果可以为GFRP锚杆的工程应用提供建议。
- GFRP锚杆 /
- 锚杆应力 /
- 承载力 /
- 冻融循环 /
- 锚固能力
Abstract:
In view of the failure of rock anchors in spring thawing periods of seasonal freezing areas, this paper aims to investigate the anchorage ability of GFRP anchors under the action of freeze-thaw cycles.Through designing the physical model, loading tests were carried out on the test blocks experiencing 25, 50, and 75 freeze-thaw cycles.According to the test data and failure phenomena, the variation laws of the stress and bearing capacity of the GFRP bolt after freeze-thaw were analyzed.The results show that the freeze-thaw cycle will lead to a decrease in bonding performance between epoxy resin mortar and concrete. After 25, 50 and 75 cycles, the bearing capacity loss is 38.24%, 42.65% and 52.94%, respectively.The ultimate bearing capacity of the bolt decreases obviously with increasing freeze-thaw cycles. The freeze-thaw cycle accelerates the deterioration of the material properties of the bonding material and the surrounding rock. In the process, the load transfer to the interior is accelerated, leading to a reduction in the stress difference among points on the GFRP bolt, and the stress distribution of the bolt is more uniform than that at room temperature. Meanwhile, the deterioration of the material properties leads to local failure ahead of time, and the overall bearing capacity of the bolt is reduced.The research results can provide suggestions for the engineering application of GFRP anchor.
- GFRP bolt /
- bolt stress /
- bearing capacity /
- freeze-thaw cycle /
- anchoring capacity

HTML全文

图 1 GFRP锚固体(单位: mm)

a.实际边坡锚固；b.GFRP锚杆模型试件图

Figure 1. GFRP anchorage

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图 2 GFRP筋

Figure 2. GFRP rebar

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图 3 加载试验设备照片

Figure 3. Photos of the loading experimental equipment

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图 4 冻融循环后的GFRP锚杆试件

Figure 4. Specimens with GFRP anchor after freeze-thaw cycles

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图 5 试验过程中GFRP锚杆试件破坏形式

Figure 5. Failure mode of the GFRP anchor in the experiment

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图 6 GFRP锚杆荷载-位移曲线

Figure 6. Load-displacement curves of the GFRP anchor

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图 7 极限承载力-冻融循环周期关系曲线

Figure 7. Relationship between ultimate bearing capacity and freeze-thaw cycles

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图 8 不同周期冻融循环下的应力-荷载曲线

Figure 8. Stress-load curves under different freeze-thaw cycles

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图 9 3 kN荷载下锚杆应力沿杆轴分布曲线

Figure 9. Distribution curve of the bolt stress along the rod axis at 3 kN

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图 10 锚杆破坏形态

a.砂浆锚杆；b.GFRP锚杆

Figure 10. Failure form of the mortar anchor

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表 1 GFRP筋物理和力学性能

Table 1. Physical and mechanical properties of GFRP rebar

名称	参数
直径/mm	20
每米重量/(kg·m^-1)	0.55
每吨米数/(m·t^-1)	1 819
抗拉强度/MPa	≥500
抗剪强度/MPa	≥100
极限应变	≥1.2
弹性模量/GPa	≥40

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表 2 混凝土、砂浆材料用量

Table 2. Material consumption of concrete and mortar

种类	水泥/g	砂/g	水/g	石子/g
混凝土	595	559	256	1 309
砂浆	661	661	278	无

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表 3 冻融循环过程中试件分组

Table 3. Grouping of specimens during freeze-thaw cycling

分组编号	冻融循环/周期	试件编号
A0	0	A-1	A-2	A-3
B25	25	B-1	B-2	B-3
C50	50	C-1	C-2	C-3
D75	75	D-1	D-2	D-3

下载: 导出CSV

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