Experimental study on surface settlements induced by sequential excavation of two parallel tunnels in drained granular soil

Zheng, Gang; Tong, Jingbo; Zhang, Tianqi; Wang, Ruikun; Fan, Qian; Sun, Jibin; Diao, Yu

doi:10.1016/j.tust.2020.103347

Cited by 26 publications

(4 citation statements)

References 12 publications

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“…In addition, studies on surface settlement patterns for double-lane tunnel building are also increasing. Existing studies show that the burying and pitch of the double-lane tunnel have a remarkable influence on surface settlement [8] , and the surface settlement brought on by the building of the double-lane tunnel frequently occurs asymmetrically [9] .…”

Section: Forewordmentioning

confidence: 99%

Research on Prediction Model of Ground Settlement for Ultra-Large Diameter Double-Line Shield Tunnel

Liu,

Zhang,

Huang

et al. 2023

Advances in Frontier Research on Engineering Structures

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The construction of double-line parallel tunnels causes significantly more surface settlement than single-track tunnels. To accurately forecast the surface settlement brought forth by the building of extremely large diameter double-track parallel shield tunnels, by introducing the correction coefficient M(x) of the formation loss rate, a model of prediction for the surface settling of super-large diameter double-line parallel tunnels is created in accordance with the Peck formula. And validate the prediction method based on a mega-diameter shield Project in Changsha. The results indicate that the double disturbance effect will cause obvious additional settlement. When considering its influence, the location of the maximum surface settlement of soil on the backward tunnel side is shifted by 2.28 m towards the advance tunnel, causing the settling curve on the backward tunnel and the overall surface settling curve to be distributed asymmetrically; Soils on the advance tunnel side are more sensitive to secondary disturbance effects; The prediction model applies to the surface settlement prediction of the super-large diameter double-line shield project in Changsha area, and the study’s findings can serve as suggestions for undertakings of a similar nature.

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Section: Forewordmentioning

confidence: 99%

Research on Prediction Model of Ground Settlement for Ultra-Large Diameter Double-Line Shield Tunnel

Liu,

Zhang,

Huang

et al. 2023

Advances in Frontier Research on Engineering Structures

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show abstract

“…is means that soil in the reduced scale model test under 1g condition would show more dilatancy than that in the field. To minimize such an effect and partially meet similarity conditions, relatively looser sand is expected in model tests as recommended by Zheng et al [24]. Considering the difficulty to obtain every loose sand in model tests, a relative density of 46-0.55 was used, which is lower than those used in previous research [25].…”

Section: Test Programmentioning

confidence: 99%

The Effects of Isolation Pile on the Ground Deformation due to a Deep Pit Excavation

Nie

Liu

et al. 2022

Advances in Materials Science and Engineering

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Pit excavation could inevitably introduce ground movement and threaten the safety of nearby existing high buildings, metro tunnels, or roads. To reduce ground movement and protect those existing structures against large deformation, isolation pile is widely used in engineering practices. A series of physical model tests was carried out to investigate the effects of isolation piles on the ground deformation induced by excavating a pit. Digital image correlation (DIC) analysis was employed to study the ground deformation and slip surface under different pile lengths and locations relative to the retaining wall. The results indicate that the ground deformation and the shear band in the ground are less affected by the existence of a pile if the isolation pile’s end is above or slightly extends beyond the slip surface. In contrast, if the isolation pile extends beyond the slip surface sufficiently, even though the ground movement behind the pile is reduced, the settlement of the soil between the pile and retaining wall would be enlarged. Meanwhile, the horizontal deformation shows an arching shape along the depths and has a noticeable value in the middle section of subsoil. The ground deformation behind the isolation pile shows dependence on the pile’s horizontal displacement, regardless of the pile’s length and location. An empirical model is proposed to evaluate the efficiency of isolation piles on settlement protection. The comparison of the prediction and the results from tests and FEA shows a reasonable agreement.

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“…Ma et al [18] converted the Gaussian curve into a linear form, and two numerical methods were used to estimate the settlement parameters induced by parallel tunnels. Zheng et al [19] investigated the interaction between parallel tunnels by the physical model test, and the differences between the surface settlement troughs above two tunnels were described in terms of parameters.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study on Surface Settlement Troughs Induced by the Sequential Excavation of Adjacent and Parallel Tunnels in Layered Soils

Dong

Lin

Cao

et al. 2022

Advances in Civil Engineering

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In this paper, the settlement troughs induced by the excavation of adjacent and parallel tunnels in layered soils were studied. Firstly, a trough width parameter calculation method in layered soils was established based on the propagation model of the plastic zone and unloading disturbance zone. Secondly, the mechanism of the superposition disturbance between parallel tunnels is analyzed, and a method for calculating additional settlement trough is proposed. Finally, the applicability of the proposed model was demonstrated with two case studies of the parallel tunnels. The following conclusions were obtained: the difference of soil properties in layered soils had a significant influence on the width parameter of surface settlement trough; a Gaussian curve can describe the additional settlement caused by superimposed disturbance; and finally, the relationship between the ground loss induced by superposition disturbance and the ground loss induced by the preceding tunnel was approximately linear. The model presented in this paper is highly effective and convenient for use in practice and extends the calculation method of surface settlement trough based on the Gaussian curve.

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Experimental study on surface settlements induced by sequential excavation of two parallel tunnels in drained granular soil

Cited by 26 publications

References 12 publications

Research on Prediction Model of Ground Settlement for Ultra-Large Diameter Double-Line Shield Tunnel

Research on Prediction Model of Ground Settlement for Ultra-Large Diameter Double-Line Shield Tunnel

The Effects of Isolation Pile on the Ground Deformation due to a Deep Pit Excavation

Analytical Study on Surface Settlement Troughs Induced by the Sequential Excavation of Adjacent and Parallel Tunnels in Layered Soils

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