考虑渗流影响的软土管幕箱涵开挖面稳定分析

刘奕晖; 黄茂松; 王浩然; 张中杰; 潘伟强

doi:10.11779/CJGE2021S2004

考虑渗流影响的软土管幕箱涵开挖面稳定分析 English Version

刘奕晖^{1, 2,},
黄茂松^{1, 2, ,},
王浩然³,
张中杰³,
潘伟强⁴

1.
同济大学地下建筑与工程系,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.
上海市城市建设设计研究总院（集团）有限公司,上海　200125
4.
上海隧道工程有限公司,上海　200032

基金项目:

国家自然科学基金重点项目 51738010

国家重点研发计划项目 2016YFC0800200

详细信息

作者简介:
刘奕晖(1998— ),男,硕士研究生,主要从事岩土工程稳定性问题研究。E-mail: Yihui_Liu1002@126.com

通讯作者:
黄茂松, E-mail: mshuang@tongji.edu.cn

中图分类号: TU43
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出版历程
- 收稿日期: 2020-08-17
- 网络出版日期: 2022-12-05
- 刊出日期: 2021-10-31

Stability of excavation face in soft soils by roof-box jacking method considering seepage

1.
Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China
2.
Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China
3.
Shanghai Urban Construction Design & Research Institute (Group) Co., Ltd., Shanghai 200125, China
4.
Shanghai Tunnel Engineering Construction Co., Ltd., Shanghai 200032, China

摘要

摘要: 管幕箱涵工法可以有效减小施工对地面交通的影响,适用于城市密集空间条件下的地下穿越工程。通过引入开挖面前方水头分布拟合公式,提出了考虑渗流影响的管幕箱涵开挖面稳定性极限平衡法,并对该极限平衡法进行了算例和工程实例的有限元模拟验证。极限平衡法计算结果和算例及实际工程案例的有限元模拟结果较为一致,验证了本文极限平衡法的合理性和有效性。研究发现,地下水渗流会对管幕作用下的箱涵开挖面稳定产生较大影响,维持开挖面稳定的极限支护压力远大于无地下水作用的情况,在实际工程中应考虑地下水渗流的影响。
- 管幕箱涵工法 /
- 渗流 /
- 开挖面稳定 /
- 极限平衡法 /
- 有限元
Abstract: The roof-box jacking method can significantly reduce the impact of construction on ground traffic. It is suitable for underground engineering under the dense urban space. The limit equilibrium method for the stability of excavation face with pipe curtain considering seepage is proposed by introducing the fitting formula for distribution of water head in front of the excavation face. The new method is verified through finite element simulations of examples and an actual project case. The results by the proposed method are in consistent with those by the finite element simulations, which verifies the rationality and effectiveness of the method. The analysis shows that the seepage has a great influence on the stability of the excavation face with pipe curtain, and the limit support pressure to maintain the stability of the excavation face is much greater than that without considering groundwater. The influences of seepage should be considered in practical projects.
- roof-box jacking method /
- seepage /
- excavation surface stability /
- limit equilibrium method /
- finite element method

HTML全文

图 1 渗流条件下极限平衡法计算示意图

Figure 1. Diagram of limit equilibrium method under seepage

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图 2 渗流条件下土条受力情况图示

Figure 2. Forces acting on a typical soil strip under seepage

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图 3 极限平衡法和弹塑性有限元结果对比

Figure 3. Comparison between limit equilibrium method and elasto-plastic finite element method

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图 4 渗流条件下的开挖面稳定性分析简图

Figure 4. Diagram of face stability analysis under seepage

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图 5 总支护压力与水位线关系图

Figure 5. Relationship between total support pressure and underground water level

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图 6 总支护压力与开挖面中点位移关系曲线

Figure 6. Relationship between total support pressure and displacement

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表 1 有限元模拟与极限平衡法计算结果对比

Table 1 Comparison between finite element method and limit equilibrium method

计算方法	总支护压力 $σ_{t}$ $σ_{t}$ /kPa
计算方法	不考虑地下水	不考虑地下水渗流	考虑地下水渗流
有限元法	33.60	115.74	70.65
极限平衡法	40.63	131.86	85.51
偏差率	20.92%	13.93%	21.03%

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参考文献(7)

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