大断面浅覆土矩形顶管模型试验研究

潘羽擎; 甄亮; 蒋海里; 李晓军

doi:10.11779/CJGE2022S2027

大断面浅覆土矩形顶管模型试验研究 English Version

潘羽擎^{1, 2,},
甄亮³,
蒋海里³,
李晓军^{1, 2}

1.
同济大学土木工程学院, 上海 200092
2.
同济大学岩土及地下工程教育部重点实验室, 上海 200092
3.
上海公路桥梁(集团)有限公司, 上海 200433

基金项目:

上海市青年科技启明星计划资助项目 19QB1401800

详细信息

作者简介:
潘羽擎(1995—)，男，硕士，主要研究顶管施工参数优化。E-mail: panyuqing@tongji.edu.cn

中图分类号: TU411
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出版历程
- 收稿日期: 2022-11-30
- 网络出版日期: 2023-03-26
- 刊出日期: 2022-11-30

Model tests on large-section and shallow soil rectangular pipe jacking

1.
College of Civil Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
3.
Technical Center, Shanghai Road and Bridge (Group) Co., Ltd., Shanghai 200433, China

摘要

摘要: 在顶管隧道施工中，同步注浆是控制地表变形和顶力控制的关键环节。目前对于传统的同步注浆研究主要局限于浆液材料，摩擦系数的研究，而对浆液本身流动及其填充机理的研究涉及很少。通过建立顶管-浆液-土体系统和模型试验装置，在考虑相似律的情况下，介绍了大断面矩形顶管同步注浆的室内缩尺模型试验研究结果，研究了传统触变浆液(由膨润土、羧甲基纤维素和纯碱组成)和HS-3复合浆液和聚丙烯酰胺复合浆液对泥浆套质量影响效果。试验中测量了土层的竖向位移变化、顶进力的大小，以观察同步注浆对地面位移和顶力的影响。探究了浅覆土大断面矩形顶管隧道同步注浆对地面位移和顶进力的大小影响规律。试验发现，在注浆情况下，顶进力可以减少40%左右。
- 模型试验 /
- 顶管-浆液-土体系统 /
- 同步注浆 /
- 矩形顶管
Abstract: During the construction of pipe jacking tunnels, the simultaneous injection is a key in controlling the surface deformation and jacking force. At present, the traditional researches on the simultaneous injection are mainly limited to those on the slurry materials and the friction coefficient, while the researches on the flow of the slurry itself and its filling mechanism are rarely involved. By establishing the pipe-slurry-soil system and the model test platform, the results of a laboratory reduced-scale model test on the simultaneous injection of slurry of super-large rectangular pipe jacking are introduced. It is shown that different slurries have different effects on the quality of the protective slurry screen, which contains the traditional thixotropic slurry (consisting of bentonite, CMC (carboxy methyl cellulose) and soda ash) and HS-3 compound slurry and polyacrylamide compound slurry. The settlements of different parts of soils and the pipe jacking forces are measured to observe the influences of the protective slurry screen on the ground settlements and the pipe jacking forces. The effects of the simultaneous injection on the ground displacements and the jacking forces of a large-section rectangular pipe-jacking tunnel with shallow overburden are explored. The test results show that the jacking forces can be reduced by about 40% under the simultaneous injection.
- model test /
- pipe-slurry-soil system /
- simultaneous injection /
- pipe jacking

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图 1 模型试验装置整体图

Figure 1. Overall layout of test system

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图 2 后管片

Figure 2. Back pipe

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图 3 前管片

Figure 3. Front pipe

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图 4 顶进系统

Figure 4. Loading system

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图 5 注浆系统

Figure 5. Injecting system

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图 6 注浆管路

Figure 6. Injecting pipeline

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图 7 可视化系统

Figure 7. Visual system

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图 8 位移监测系统

Figure 8. Displacement monitoring system

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图 9 S型传感器

Figure 9. S-type sensor

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图 10 土压力计传感器

Figure 10. Miniature soil pressure gauges

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图 11 管节摩阻力值

Figure 11. Friction values of pipe jacking

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表 1 土体力学参数及相似比

Table 1 Mechanical parameters and similarity ratios of soils

土体种类	${\lambda _l}$ /(kN∙m^-3)	${C_{{\gamma _l}}}$	${\varphi _l}$ /(°)	${C_{{\varphi _l}}}$	${C_l}$ /kPa	${C_{{C_l}}}$	E /MPa	${C_E}$
原型土	17.2	0.96	15.0	0.95	11.0	1.03	2.9	9.7
模型土	17.9	0.96	15.8	0.95	10.7	1.03	0.3	9.7

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表 2 模型浆液1参数指标及相似比

Table 2 Mechanical parameters and similarity ratios of Slurry 1

浆液种类	参数指标及相似比
浆液种类	$\psi$ /1	${C_\psi }$	$\tau$ /Pa	${C_\tau }$	p/Pa	${C_p}$
原型浆液1	0.044	1.07	12.3	9.5	4	10.5
模型浆液1	0.041	1.07	1.3	9.5	0.38	10.5

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表 3 模型浆液2参数指标及相似比

Table 3 Mechanical parameters and similarity ratios of Slurry 2

浆液种类	参数指标及相似比
浆液种类	$\psi$ /1	${C_\psi }$	$\tau$ /Pa	${C_\tau }$	p/Pa	${C_p}$
原型浆液2	0.027	0.68	42.4	11.5	9.7	10.5
模型浆液2	0.040	0.68	3.7	11.5	0.92	10.5

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表 4 模型浆液3参数指标及相似比

Table 4 Mechanical parameters and similarity ratios of Slurry 3

浆液种类	参数指标及相似比
浆液种类	$\psi$ /1	${C_\psi }$	$\tau$ /Pa	${C_\tau }$	p/Pa	${C_p}$
原型浆液3	0.021	0.75	52.1	10.2	12.6	11.5
模型浆液3	0.029	0.75	5.1	10.2	1.1	11.5

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表 5 试验工况

Table 5 Test conditions

工况	浆液种类	埋深/cm	顶进速度/(mm·s^-1)	注浆率 /%
工况1	浆液1	35	0.150	300
工况2	浆液2	35	0.150	300
工况3	浆液3	35	0.150	300
工况4	浆液2	25	0.150	300
工况5	浆液2	25	0.046	300
工况6	浆液2	25	0.150	200
工况7	浆液2	25	0.046	200

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