马蹄形预制及喷锚初期支护结构试验对比研究

白中坤; 毕程程; 赵修旺; 薛永涛

doi:10.3969/j.issn.0258-2724.20220197

马蹄形预制及喷锚初期支护结构试验对比研究

doi: 10.3969/j.issn.0258-2724.20220197

中铁工程装备集团有限公司，河南郑州 450016

基金项目: 云南省重点科技专项计划（202002AF080003-4）

详细信息

作者简介:
白中坤（1985—），男，高级工程师，研究方向为隧道与地下工程新技术，E-mail：263090693@qq.com

通讯作者:
毕程程（1991—），男，工程师，研究方向为隧道与地下工程新工法和新结构，E-mail：923859813@qq.com

中图分类号: U451
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- 被引次数: 0
出版历程
- 收稿日期: 2022-03-18
- 修回日期: 2022-06-30
- 网络出版日期: 2023-11-18
- 刊出日期: 2022-07-06

Experimental Comparison of Horseshoe Prefabricated and Spray Anchor Initial Support Structures

China Railway Engineering Equipment Group Co., Ltd., Zhengzhou 450016, China

摘要

摘要:
为研究新型马蹄形预制初期支护结构的力学变形特征，与喷锚初期支护结构进行比较，开展2类结构的原型加载试验，系统性地从结构设计、衬砌预制、试验加载及结果分析等方面进行详细介绍，并对试验结果进行深入分析. 研究结果表明：预制初期和喷锚初期，支护结构的极限承载力分别为2.80倍和1.32倍设计荷载，前者的极限承载能力约为后者的2.12倍；预制初期，支护结构在拱顶、拱腰位置受正弯矩和负轴力作用，在拱肩和拱底位置受负弯矩和正轴力作用，喷锚初期，支护结构与之相近，临近破坏阶段，前者的最大弯矩约为后者的1.39倍，最大轴力约为后者的1.45倍；预制初期支护结构和喷锚初期支护结构凹凸变形趋势基本一致，结构破坏时呈现右拱肩外凸，右拱腰内凹，且型钢与混凝土产生剥落，前者极限变形能力约为后者的1.20倍.
- 马蹄形 /
- 预制初期支护 /
- 喷锚初期支护 /
- 承载能力 /
- 变形能力
Abstract:
In order to study the mechanical deformation characteristics of the new horseshoe prefabricated initial support structure and compare its difference with the spray anchor initial support structure, the prototype loading tests of two types of structures were carried out. The structural design, lining prefabrication, test loading, and result analysis were introduced systematically, and the test results were deeply analyzed. The results show that the ultimate bearing capacity of the prefabricated initial support structure is 2.80 times the design load, and that of the spray anchor initial support structure is 1.32 times the design load. The ultimate bearing capacity of the former is about 2.10 times that of the latter. The prefabricated initial support structure is affected by the positive bending moment and negative axial force at the vault and the arch waist, as well as the negative bending moment and positive axial force at the arch shoulder and the arch bottom. The spray anchor initial support structure is similar. The maximum moment and the maximum axial force of the prefabricated initial support structure are about 1.39 and 1.45 times that of the spray anchor initial support structure near the destruction phase, respectively. The concave and convex deformation trend of the prefabricated initial support structure is basically the same as that of the spray anchor initial support structure. The right arch shoulder is convex, and the right arch waist is concave, with steel and concrete spalling when the structure is damaged, and the ultimate deformation capacity of the prefabricated initial support structure is about 1.20 times that of the spray anchor initial support structure.
- horseshoe /
- prefabricated initial support /
- spray anchor initial support /
- bearing capacity /
- deformation capacity

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图 1 结构设计图

Figure 1. Structural design

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图 2 弯矩轴力包络图

Figure 2. Envelope of bending moment and axial force

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图 3 预制初期支护结构

Figure 3. Prefabricated initial support structure

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图 4 喷锚初期支护结构

Figure 4. Spray anchor initial support structure

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图 5 试验平台及加载点

Figure 5. Test platform and loading points

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图 6 荷载等效

Figure 6. Load equivalent

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图 7 结构径向加载梯度

Figure 7. Radial loading gradient of structure

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图 8 径向监测方案

Figure 8. Radial monitoring scheme

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图 9 钢筋计布置

Figure 9. Reinforcement meter arrangement

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图 10 预制结构变形

Figure 10. Deformation of prefabricated structure

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图 11 预制结构变形内侧展开图

Figure 11. Inner expansion of prefabricated structure deformation

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图 12 喷锚结构变形

Figure 12. Deformation of spray anchor structure

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图 13 喷锚结构变形内侧展开图

Figure 13. Inner expansion of spay anchor structure deformation

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图 14 钢筋计横断面布置

Figure 14. Cross-sectional layout of reinforcement meter

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图 15 预制结构截面内力

Figure 15. Internal force of prefabricated structure

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图 16 喷锚结构截面内力图

Figure 16. Internal force of spray anchor structure

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图 17 预制结构变形破坏结果

Figure 17. Deformation and failure of prefabricated structure

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图 18 喷锚结构变形破坏结果

Figure 18. Deformation and failure of spray anchor structure

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表 1 材料参数

Table 1. Material parameter

类别	参数名称	取值
围岩级别Ⅴ级	弹性抗力系数/（MPa·m⁻¹）	150
	变形模量/GPa	1.5
	围岩密度/（kN·m⁻³）	19
	内摩擦角/（°）	25
	计算摩擦角/（°）	45
	泊松比	0.38
衬砌材料 C30 混凝土	弹性模量/GPa	3.0
	抗压强度/MPa	22.5
	抗拉强度/MPa	2.2
钢筋种类 HRB400	强度标准值/MPa	400
	强度设计值/MPa	360
	弹性模量/GPa	200

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表 2 截面每延米抗压能力

Table 2. Compressive capacity per meter of section kN

部位	拱顶	拱肩	边墙	仰拱
抗压承载力	4789.35	4561.20	6300	6300

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