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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

42卷

期数:

2025年03期

页码:

172-182

栏目:

岩土工程

出版日期:

2025-05-30

文章信息/Info

Title:

Study on bearing characteristics of reinforced cage expanded head anchor rods in gravelly clay strata

文章编号:

1673-2049(2025)03-0172-11

作者:

张信贵¹,田应志¹,韩 伟²,张懿丹²,潘政宇³

(1. 广西大学 土木建筑工程学院,广西 南宁 530004; 2. 广西大学设计院有限公司,广西 南宁 530007; 3. 广西交科集团有限公司,广西 南宁 530007)

Author(s):

ZHANG Xingui¹, TIAN Yingzhi¹, HAN Wei², ZHANG Yidan², PAN Zhengyu³

(1. School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, Guangxi, China; 2. Guangxi University Design Institute Co., Ltd., Nanning 530007, Guangxi, China; 3. Guangxi Transportation Science and Technology Group Co., Ltd., Nanning 530007, Guangxi, China)

关键词:

钢筋笼扩大头锚杆;  含砾黏土;  承载特性;  侧压力系数;  塑性变形

Keywords:

reinforced cage expanded head anchor rod;  gravelly clay;  bearing characteristic;  lateral pressure coefficient;  plastic deformation

分类号:

TU473

DOI:

10.19815/j.jace.2023.09048

文献标志码:

A

摘要:

为了研究钢筋笼扩大头锚杆在含砾黏土地层的承载性能,根据6根不同扩大头尺寸、扩大头长度和总长度的锚杆现场破坏试验确定抗拔力极限值的计算方法; 根据破坏试验设计工程项目钢筋笼扩大头抗浮锚杆尺寸,进行6根相同设计参数的钢筋笼扩大头抗浮锚杆验收试验; 建立三维有限元模型,通过与现场试验结果进行荷载-位移曲线和抗拔力极限值双元参数拟合对比,验证模型的合理性,研究钢筋笼扩大头锚杆荷载传递规律、荷载分担比,分析其失效破坏机理。结果表明:相较于等直径锚杆,钢筋笼扩大头锚杆承载力、变形控制能力提升显著,含砾黏土地层非预应力钢筋笼扩大头锚杆侧压力系数ξ取0.8K_a(K_a为扩大头锚杆前端土体主动土压力系数)较为合理; 含砾黏土地层钢筋笼扩大头锚杆塑性变形占比较大,拉拔荷载达到0.6倍抗拔力极限值时,锚杆塑性位移占总位移比值达到49.81%～55.01%; 普通段侧摩阻力、扩大头端阻力、扩大段侧摩阻力分别占锚杆极限承载力的44.2%、12.2%、43.6%; 扩大头锚杆侧摩阻力沿深度方向整体呈增大-减小-增大-减小的趋势; 锚杆顶部和扩大头顶部土体最早出现塑性区,随着荷载增大,塑性区沿轴向不断发展直至贯通,锚杆失效。

Abstract:

In order to investigate the bearing performance of reinforced cage expanded head anchor rods in gravelly clay strata, the field destructive tests were conducted on six anchor rods with different expanded head sizes, expanded head lengths and total lengths to determine the calculation method of the ultimate pullout force. Based on the results of the destructive tests, the size of reinforced cage expanded head anti-floating anchor rod of engineering project was designed, and the acceptance tests were carried out on six reinforced cage expanded head anti-floating anchor rods with the same design parameters. A three-dimensional finite element model was established, and the rationality of the model was verified by fitting and comparing the load-displacement curve and the ultimate pullout force of the model with the field test results. The load transfer mechanism and load sharing ratio of reinforced cage expanded head anchor rods were studied and the failure mechanisms were analyzed. The results show that compared to anchor rods with the same diameter, the reinforced cage expanded head anchor rods exhibit significantly improved bearing capacity and deformation control ability. For non-prestressed reinforced cage expanded head anchor rods in gravelly clay strata, a lateral pressure coefficient of 0.8K_a(K_a is the active soil pressure coefficient of soil at the front end of expanded head anchor rod)is found to be reasonable. In gravelly clay strata, the plastic deformation of reinforced cage expanded head anchor rods account for a significant proportion, with the ratio of plastic displacement to total displacement reaching 49.81% to 55.01% when the tensile load reached 0.6 times of the ultimate pullout force. The friction resistance in the ordinary section, end resistance of the expanded head and friction resistance in the expanded section account for 44.2%, 12.2%, 43.6% of the anchor rod's ultimate bearing capacity, respectively. The lateral friction resistance of expanded head anchor rod shows an overall trend of increasing-decreasing-increasing-decreasing along the depth direction. The plastic zone first appears in the soil at the top of anchor rod and expanded head. As the load increases, the plastic zone continues to develop along the axial direction until it penetrates, and the anchor rod fails.

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备注/Memo

备注/Memo:

收稿日期:2023-09-11
基金项目:广西重点研发计划项目(桂科AB22035011); 中化地质矿山总局资助项目(ZHTD202101)
作者简介:张信贵(1965-),男,工学博士,教授,博士生导师,E-mail:xgzhangchn@foxmail.com。
Author resume: ZHANG Xingui(1965-), male, PhD, professor, E-mail: xgzhangchn@foxmail.com.

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更新日期/Last Update: 2025-06-01