Face stability analysis of EPB shield tunnel in dense sand stratum considering the evolution of failure pattern

Cheng, Cheng; Ni, Pengpeng; Zhao, Wen; Jia, Pengjiao; Gao, Song; Wang, Zhiguo; Deng, Changchuan

doi:10.1016/j.compgeo.2020.103890

Cited by 24 publications

(2 citation statements)

References 38 publications

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“…In addition, several methodologies consist of the fieldscale tests, numerical analysis as well as analytical solutions for studying the consolidation behaviors of the composite foundations reinforced by different vertical elements. Because of the accuracy and convenience for end-users, analytical solutions are more popular than field measurement and numerical methods [16,34,35]. Considerable achievements on the consolidation of the permeable column-and impermeable pile-reinforced composite foundations which adopted Biot's consolidation theory have been obtained [13,36,37].…”

Section: Introductionmentioning

confidence: 99%

Analytical Solution for Consolidation Behaviors of Combined Composite Foundation Reinforced with Penetrated PCCSs and Floating DM Columns

Zhang

Liu

et al. 2023

Geofluids

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As the composite pile, the precast concrete piles reinforced with cement-treated soil (PCCS) is formed by driving the precast cement (PC) pile into the deep mixing (DM) column, which has been successfully and widely utilized to support buildings and embankments over soft soil. To increase the pile spacing and give full play to the economic merits of the PCCS, a reinforcement scheme, which involves the combined use of rigid piles and flexible columns, employing penetrated PCCSs and floating DM columns is proposed and utilized for soft soil ground treatment. However, there is a lack of feasible method for consolidation behaviors of this combined composite foundation (CCF) reinforced with penetrated PCCSs and floating DM columns under flexible loads. This paper developed an analytical solution to predict the average consolidation degree of this CCF based on a cylinder consolidation model and double-layer ground consolidation theory. The excess pore pressure and average consolidation degree were calculated by considering the composite pile penetration into the cushion. The analytical method agrees well with results obtained by numerical analysis. Additionally, a parametric study was conducted systematically to analyze the effect of key influence factors on the average consolidation degree of this CCF. The results indicate that the consolidation rate of this CCF can be much faster than that of the natural ground. The consolidation rate strongly depends on the compressive modulus and area replacement ratio of PCCSs. The increasing inner core-outer core modulus ratio and the inner core-subsoil modulus ratio increase the consolidation rate of this CCF. In addition, the consolidation rate increases with the gravel cushion-subsoil modulus ratio, while it decreases with the loading period.

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Section: Introductionmentioning

confidence: 99%

Analytical Solution for Consolidation Behaviors of Combined Composite Foundation Reinforced with Penetrated PCCSs and Floating DM Columns

Zhang

Liu

et al. 2023

Geofluids

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“…Te main methods for studying on the surrounding stratum self-stabilizing capacity and the deformation characteristics of the multiline parallel pipe-jacking construction include the theoretical analysis method [15][16][17][18][19], model test method [20,21], in situ test method [22,23], and numerical computational method [24][25][26][27][28][29]. At present, the numerical calculation method has become an increasingly important tool in urban underground engineering research due to its advantages of the high speed, high accuracy, low cost, time-saving and labor-saving, and strong adaptability to complex conditions and processes.…”

Section: Introductionmentioning

confidence: 99%

Study on the Division of the Affected Zone under Construction Unloading and Its Construction Sequence of the Multiline Parallel River-Crossing Pipe Jacking

Ziguang,

Ruijin,

Jiesheng

et al. 2023

Advances in Civil Engineering

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There are many advantages of reasonably determining the affected zone and its construction sequence for the multiline parallel pipe-jacking construction, such as convenient to reasonably arrange the pipeline section distribution mode, reducing the construction safety risk, and construction difficulty. Combined with the engineering construction practice of the multiline parallel pipe-jacking project for the north city drainage and flood control project through Chu River in Hefei, the strength reduction method has been utilized to study the surrounding stratum FOS for the pipe-jacking construction unloading under different overburden thickness Hs, different clear distance D, and different river water depth H w in this paper. The formula of the minimum critical overburden thickness Hsmin and the minimum critical clear distance Dmin of the surrounding stratum self-stability during pipe-jacking construction unloading have been derived. The division method of the affected zone for the multiline parallel river-crossing pipe-jacking construction which behaves as the mutual influence nonself-stability zone, the mutual influence self-stability zone, and the no mutual influence self-stability zone has been proposed. For further discussion, the construction sequence of the multiline parallel river-crossing pipe jacking has been studied.

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Analysis on face stability of rectangular cross-sectional shield tunneling based on an improved two-dimensional rotational mechanism

Liu

Shi

et al. 2021

Acta Geotech.

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Face stability analysis of EPB shield tunnel in dense sand stratum considering the evolution of failure pattern

Cited by 24 publications

References 38 publications

Analytical Solution for Consolidation Behaviors of Combined Composite Foundation Reinforced with Penetrated PCCSs and Floating DM Columns

Analytical Solution for Consolidation Behaviors of Combined Composite Foundation Reinforced with Penetrated PCCSs and Floating DM Columns

Study on the Division of the Affected Zone under Construction Unloading and Its Construction Sequence of the Multiline Parallel River-Crossing Pipe Jacking

Analysis on face stability of rectangular cross-sectional shield tunneling based on an improved two-dimensional rotational mechanism

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