盾构穿越软硬复合地层开挖面稳定性分析

doi:10.12066/j.issn.1007-2861.2228

Abstract

Abstract:

When the shield passes through composite strata, especially the upper soft and lower hard strata, instability of the excavation surface is variable and the stress mechanism is complex. Consequently, engineering disasters caused by instability of the excavation surface can occasionally occur. Based on the Fo-Guan intercity railway tunnel project, a three-dimensional finite element numerical model is constructed and a stratum composite ratio parameter is introduced to improve the wedge theory of earth pressure. The effects of different stratum composite ratios and soft soil internal friction angles on the stability of the excavation surface when the shield passes through the upper-soft and lower-hard strata are analyzed. The results indicate that the maximum deformation of the shield excavation face appears at a specific position in the soft soil area, which is related to the proportion of soft soil. The displacement of the excavation face can be divided into three stages: slow growth, sharp increase, and instability failure. When the support pressure ratio is close to the limit support pressure ratio, the excavation face deformation will increase sharply. The theoretical solution of the improved partial wedge model is consistent with the numerical simulation results, and the theory is reasonable. These research results can provide some theoretical guidance for shield construction of similar strata.

Key words: shield tunnel, upper-soft and lower-hard ground, excavation face stability, minimum support pressure ratio, limit equilibrium

CLC Number:

ZHOU Liji, ZHANG Mengxi, WANG Wei, JIA Wurong, ZHANG Xiaoqing. Stability mechanism of the excavation face for shield tunneling in soft and hard composite ground[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(6): 1094-1105.

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References 17

[1]	宋春霞, 黄茂松, 吕玺琳. 非均质地基中平面应变隧道开挖面稳定上限分析[J]. 岩土力学, 2011, 32(9): 2645-2650.
	Song C X, Huang M S, Lü X L. Upper bound analysis of plane strain tunnel in nonhomogeneous clays[J]. Rock and Soil Mechanics, 2011, 32(9): 2645-2650.
[2]	程建龙, 杨圣奇, 杜立坤, 等. 复合地层中双护盾 TBM 与围岩相互作用机制三维数值模拟研究[J]. 岩石力学与工程学报, 2016, 35(3): 511-523.
	Cheng J L, Yang S Q, Du L K, et al. Three-dimensional numerical simulation on interaction between double-shield TBM and surrounding rock mass in composite ground[J]. Chinese Journal of Rock Mechanics and Engineering, 2016, 35(3): 511-523.
[3]	梁桥, 杨小礼, 张佳华, 等. 非均质土体中盾构隧道开挖面支护力上限分析[J]. 岩土力学, 2016, 37(9): 2585-2592.
	Liang Q, Yang X L, Zhang J H, et al. Upper bound analysis for supporting pressure of shield tunnel in heterogeneous soil[J]. Rock and Soil Mechanics, 2016, 37(9): 2585-2592.
[4]	袁大军, 沈翔, 刘学彦, 等. 泥水盾构开挖面稳定性研究[J]. 中国公路学报, 2017, 30(8): 24-37.
	Yuan D J, Shen X, Liu X Y, et al. Research on excavation face stability of slurry shield tunneling[J]. China Journal of Highway and Transport, 2017, 30(8): 24-37.
[5]	王振飞, 张成平. 泥水盾构开挖面失稳破坏的颗粒流模拟研究[J]. 中国铁道科学, 2017, 38(3): 55-62.
	Wang Z F, Zhang C P. Research on particle flow simulation for excavation face instability of slurry shield[J]. China Railway Science, 2017, 38(3): 55-62.
[6]	徐前卫, 唐卓华, 朱合华, 等. 盾构隧道开挖面极限支护压力研究[J]. 岩土工程学报, 2017, 39(7): 1234-1240.
	Xu Q W, Tang Z H, Zhu H H, et al. Limit support pressure at excavation face of shield tunnels[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(7): 1234-1240.
[7]	安永林, 李佳豪, 曹前, 等. 上软下硬地层隧道掌子面稳定性及塌方形态[J]. 中国铁道科学, 2019, 40(1): 79-87.
	An Y L, Li J H, Cao Q, et al. Tunnel face stability and collapse shape in ppper-soft and lower-Hard strata[J]. China Railway Science, 2019, 40(1): 79-87.
[8]	吕玺琳, 王浩然, 黄茂松. 盾构隧道开挖面稳定极限理论研究[J]. 岩土工程学报, 2011, 33(1): 57-62.
	Lü X L, Wang H R, Huang M S. Limit theoretical study on face stability of shield tunnels[J]. Chinese Journal of Geotechnical Engineering, 2011, 33(1): 57-62.
[9]	武军, 廖少明, 时振昊. 考虑土拱效应的盾构隧道开挖面稳定性[J]. 同济大学学报(自然科学版), 2015, 43(2): 213-220.
	Wu J, Liao S M, Shi Z H. Workface stability of shield tunnel considering arching effect[J]. Journal of Tongji University (Natural Science), 2015, 43(2): 213-220.
[10]	Horn M. Horizontal earth pressure on perpendicular tunnel face[C]// Hungarian National Conference of the Foundation Engineer Industry. 1961: 7-16.
[11]	Jancsecz S, Steiner W. Face support for a large mix-shield in heterogeneous ground conditions[C]// Institution of Mining and Metallurgy, Tunneling 94. New York: Springer, 1994: 531-550.
[12]	Broere W. Tunnel face stability and new CPT applications[D]. Delft: Delft University of Technology, 2001.
[13]	Hu X Y, Zhang Z X, Kieffer S. A real-life stability model for a large shield-driven tunnel in heterogeneous soft soils[J]. Frontiers of Structural and Civil Engineering, 2012, 6(2): 176-187.
[14]	王有成, 张孟喜, 李磊, 等. 软土盾构不同穿越形式对既有隧道扰动影响分析[J]. 上海大学学报(自然科学版), 2014, 20(5): 573-585.
	Wang Y C, Zhang M X, Li L, et al. Analysis of disturbance influence of different shield crossing forms of soft soil on existing tunnel[J]. Journal of Shanghai University (Natural Science Edition), 2014, 20(5): 573-585.
[15]	Anagnostou G, Kovari K. The face stability of slurry-shield-driven tunnels[J]. Tunnelling and Underground Space Technology, 1994, 9(2): 165-174. doi: 10.1016/0886-7798(94)90028-0
[16]	李清川, 李术才, 王汉鹏, 等. 上覆流沙层隧道开挖面稳定性分析与数值试验研究[J]. 岩土力学, 2018, 39(7): 1-10.
	Li Q C, Li S C, Wang H P, et al. Stability analysis and numerical experiment study of excavation face for tunnels overlying quicksand stratum[J]. Rock and Soil Mechanics, 2018, 39(7): 1-10.
[17]	张晓清, 张孟喜, 李林, 等. 多线叠交盾构隧道近距离穿越施工扰动机制研究[J]. 岩土力学, 2017, 38(4): 1133-1140.
	Zhang X Q, Zhang M X, LI L, et al. Mechanism of approaching construction disturbance caused by multi-line uverlapped shield tunneling[J]. Rock and Soil Mechanics, 2017, 38(4): 1133-1140.

Stability mechanism of the excavation face for shield tunneling in soft and hard composite ground

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