水平荷载作用下压力型扩大头锚杆承载特性试验研究

王哲; 陆柯颖; 王乔坎; 崔涵晟; 任康; 马少俊; 许四法

doi:10.11779/CJGE2020S1038

水平荷载作用下压力型扩大头锚杆承载特性试验研究 English Version

1.
浙江工业大学土木工程学院,浙江　杭州310023
2.
浙江省建筑设计研究院,浙江　杭州310006

基金项目:

国家自然科学基金项目 51778585

详细信息

作者简介:
王哲（1978— ）,男,博士,教授,主要从事岩土工程的教学和科研工作。E-mail：wangzsd@zjut.edu.cn

通讯作者:
许四法, E-mail：xusifa@zjut.edu.cn

中图分类号: TU442
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出版历程
- 收稿日期: 2020-06-02
- 网络出版日期: 2022-12-07
- 刊出日期: 2020-10-31

Experimental study on failure characteristics of pressured under-reamed anchors under horizontal loads

1.
College of Civil Engineering and Architecture, Zhejiang University of Technology, Zhejiang 310023, China
2.
Zhejiang Province Institute of Architectural Design and Research, Zhejiang 310006, China

摘要

摘要: 通过自行研制的模型试验装置,利用PIV技术研究水平荷载作用下压力型扩大头锚杆力学特性以及周围土体位移发展机理。试验结果表明,压力型扩大头锚杆的受力过程可分为侧摩阻力阶段、过渡阶段和端部阻力阶段,在每个阶段转变之间荷载位移曲线会出现“拐点”。基于数字图像分析,提出压力型扩大头锚杆扩大头锚固段近端土体临界位移场影响范围呈“灯泡型”,且当扩大头锚固段长径比超过3∶1后,随着继续增大长径比对扩大头锚固段近端的位移场范围基本无影响。
- 水平荷载 /
- 压力型扩大头锚杆 /
- 模型试验 /
- 破坏特性 /
- 土体发展机理
Abstract: Through a self-developed model test device and PIV technology, the mechanical characteristics of pressured under-reamed anchors under horizontal loads and the development mechanism of the surrounding soil displacement are studied. The test results show that the stress process of the pressured under-reamed anchors can be divided into lateral friction stage, transition stage and end resistance stage, and there will be an "inflection point" in the load-displacement curve between the transitions of each stage. According to the image analysis, it is proposed that the influence range of critical displacement field of soil around the under-reamed anchorage segment of pressured anchor is "bulb-shaped". When the length-diameter ratio of the enlarged head anchoring section exceeds 3∶1, the displacement field at the proximal end of the under-reamed anchoring section is basically unaffected with the continuous increase of length-diameter ratio.
- horizontal loading /
- pressured under-reamed anchor /
- model test /
- failure characteristic /
- development mechanism of surrounding soil

HTML全文

图 1 扩大头锚杆半模型试验装置

Figure 1. Half-model test set-up of under-reamed anchor

下载: 全尺寸图片幻灯片

图 2 扩大头锚杆荷载-位移曲线

Figure 2. Q-S curves of under-reamed anchors

下载: 全尺寸图片幻灯片

图 3 木制扩大头锚固段周边土体位移场

Figure 3. Displacement fields of soil around wooden under-reamed bonding segment

下载: 全尺寸图片幻灯片

图 4 橡胶扩大头锚固段周围土体位移场

Figure 4. Displacement fields of soil around rubber under-reamed bonding segment

下载: 全尺寸图片幻灯片

表 1 标准砂物理力学参数表

Table 1 Physical and mechanical parameters of standard sand

重度 $γ$ $γ$ /(kN·m^-3)	密度 $ρ$ $ρ$ /(g·cm^-3)	含水率/%	黏聚力c/kPa	内摩擦角 $φ$ $φ$ /(°)	土粒相对密度 $G_{s}$ $G_{s}$	不均匀系数 $C_{u}$ $C_{u}$
17.25	1.76	0.037	0	33.2	2.67	4.77

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表 2 扩大头锚杆物理力学参数表

Table 2 Physical and mechanical parameters of under-reamed anchors

类型		重度 $γ$ $γ$ /(kN·m^-3)	弹性模量E/GPa	抗压强度/MPa	泊松比 $ν$ $ν$
扩大头锚固段	木块	6.9	7.5	24	0.47
扩大头锚固段	橡胶	12.5	4.4	—	0.49
钢螺纹杆		79.3	206	—	0.30

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表 3 锚固段对锚杆承载力的影响

Table 3 Effects of water content on bearing capacity of anchors

类型	锚固段长度/cm	第一阶段承载力/N	第二阶段承载力/N	第三阶段承载力/N
木制	10	160.15	206.72	296.61
	15	116.09	196.66	323.93
	20	163.77	232.29	331.34
橡胶	10	61.02	198.90	321.48
	15	76.30	200.93	367.66
	20	81.21	215.98	350.31

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表 4 临界位移场影响范围统计

Table 4 Influence ranges of critical displacement field

类别	长度/cm	D₁/D	D₂/D	D₃/D	$β_{1}$ $β_{1}$ /(°)	$β_{2}$ $β_{2}$ /(°)
木制锚固段	10	3.6	3.0	2.1	34	28
	15	4.3	3.0	2.0	35	28
	20	4.3	3.1	2.1	25	21
橡胶锚固段	10	4.0	2.5	2.4	35	34
	15	3.8	2.8	1.9	37	34
	20	3.9	2.8	2.1	32	28

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