盾构隧道开挖及补偿注浆对地层扰动影响的室内试验及数值模拟研究

郑刚; 张扶正; 张天奇; 查万理

doi:10.11779/CJGE201610001

盾构隧道开挖及补偿注浆对地层扰动影响的室内试验及数值模拟研究 English Version

郑刚^1,2,
张扶正^1,2,
张天奇^1,2,
查万理^1,2

1. 滨海土木工程结构与安全教育部重点试验室,天津 300072；
2. 天津大学土木工程系,天津 300072

详细信息

作者简介:
郑刚（1967- ）,男,贵州人,博士,教授,博士生导师,从事土力学及岩土工程的教学与科研工作。E-mail: zhenggang1967@163.com。

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出版历程
- 收稿日期: 2015-07-19
- 发布日期: 2016-10-24

Disturbance of shield tunnel excavation and compensation grouting to surrounding soil: laboratory tests and numerical simulations

1. MOE Key Laboratory of Coast Civil Structure Safety, Tianjin 300072, China;
2. Department of Civil Engineering, Tianjin University, Tianjin 300072, China

摘要

摘要: 针对盾构法施工过程中产生的土体损失,补偿注浆是一种应用广泛的沉降控制措施。通过模型试验及数值模拟,研究了盾构隧道开挖及补偿注浆对周围土体的扰动影响。将开挖和补偿注浆连续考虑,重点研究了既有土体损失情况下补偿注浆对地表沉降和周围土体应力的影响规律,研究结果表明,盾构隧道开挖过程中,地表沉降可以用Peck公式有效预测,且沉降最大值与土体损失率呈线性关系,隧道周围土体按照应力变化情况分为正拱区、卸荷区、塑性区。补偿注浆过程中,土体按应力变化情况分为抬升挤压区和正拱补偿区。应用小应变本构模型（HSS）进行数值模拟,模拟结果与试验规律对应良好,进一步验证了模型试验揭示的隧道开挖和补偿注浆对土体的扰动机理。
- 盾构隧道 /
- 模型试验 /
- 地表沉降 /
- 土体应力变化 /
- 小应变本构 /
- 砂土
Abstract: Compensation grouting, as an effective remedial measure, is often adopted to deal with the soil loss engendered in shield tunneling. The model tests with two different scales in dry sand are performed to investigate the disturbance of tunnel excavation and compensation grouting to the surrounding soil. By “tunneling” and “grouting” sequentially in the test, the effect of compensation grouting on both surface settlements and soil stresses in the presence of soil loss is studied. The test data indicate that the surface settlements caused by tunnel excavation can be effectively predicted by the Peck formula, and the maximum settlement value is approximately proportional to the volume loss. During the stage of tunneling, the soil can be divided into three zones corresponding to the stress changes, i.e., the positive arching zone, the unloading zone and the plastic zone. During the stage of grouting, the soil can be divided into two zones according to the stress changes, i.e., the effective upheaval zone and the arching compensation zone. The two-dimensional finite element analysis considering small-strain behavior of the soil is carried out to reproduce the test data, and the simulated results correspond well to the test data, helping to further validate the disturbance mechanism by both “tunneling” and “grouting” revealed in model tests.
- shield tunnel /
- model test /
- surface settlement /
- soil stress change /
- small-strain constitutive model /
- sand

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参考文献(16)

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