Centrifugal model tests on face failure of earth pressure balance shield induced by steady state seepage in saturated sandy silt ground

Chen, Renpeng; Yin, Xinsheng; Tang, Lvjun; Chen, Yunmin

doi:10.1016/j.tust.2018.06.031

Cited by 111 publications

(15 citation statements)

References 15 publications

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“…In order to study the response of tunnel excavation to strata, more and more modeling techniques have been developed and applied. From the point of view of gravity mechanics, the model tests mainly include centrifugal model tests and conventional model tests (Nomoto et al, 1999;Berthoz et al, 2012;Berthoz et al, 2018;Chen et al, 2018;Song and Marshall, 2020). N. Loganathan accelerated the centrifuge to 100 g, used a scale model of 1:100, and evaluated the soil deformation caused by tunnel excavation through three centrifugal model tests and measured the vertical and lateral ground motions induced by the excavation (Loganathan et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Displacement response characteristics of different sand tunnel excavation faces under true triaxial loading

Gao

et al. 2023

Front. Earth Sci.

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During the construction of subway tunnels, the geotechnical body is affected by excavation to produce three-dimensional spatial deformation. The deformation of geotechnical bodies is an important safety hazard for project advancement, so it is important to understand the excavation disturbance range and deformation mechanism. The current related research is mainly about the theory of land subsidence and the two-dimensional plane displacement of the stratum, and there are few studies on the specific three-dimensional disturbance mode and its mechanism. In order to better understand the three-dimensional displacement characteristics of the tunnel excavation soil, a tunnel excavation model test was established based on a true triaxial stress loading system combined with three-dimensional scanning technology for a superimposed sandy soil. Based on the established model, the vector displacement response range and three-dimensional deformation characteristics of the excavation face were studied in the main displacement affected area around the excavation face. Meanwhile, the deformation characteristics, such as vertical settlement and horizontal displacement of the stratum in the main influence area were analyzed. The results show that the main influence area of tunnel excavation is elliptical and distributed within a range of twice the diameter of the tunnel axis. The main influence range is bell-shaped in the vertical direction and inverted wedge-shaped in the horizontal direction. The three-dimensional space presents a “W” deformation distribution. The three-dimensional deformation theoretical model of the excavation face established in this paper can provide some references for the excavation engineering of superimposed sand-soil tunnels.

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Section: Introductionmentioning

confidence: 99%

Displacement response characteristics of different sand tunnel excavation faces under true triaxial loading

Gao

et al. 2023

Front. Earth Sci.

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“…(Lin et al, 2018). Among them, the geotechnical centrifugal model test is becoming more and more popular with researchers, because it uses the super-gravity field to make the test object obtain the internal stress state of its weight similar to the prototype, thereby effectively ensuring that the static/ dynamic response, stress path, deformation, and failure mechanism of the test body are highly consistent with the prototype (El Sawwaf et al, 2006;Chen et al, 2018;Weng et al, 2020). It is generally recognized by international engineering and academic circles.…”

Section: Introductionmentioning

confidence: 99%

Research on Application of Multi-Channel Selector in Centrifugal Model Test of Anchoring Slope by Frame Beam

et al. 2021

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An anchoring frame beam is a very common form of support for reinforced slopes, especially in alpine regions. Centrifugal tests have proved to be an intuitive and effective means of investigating the mechanism of action of frame beams. However, the data acquisition system of the geotechnical centrifuge in service has the problem of a small number of acquisition channels. A multi-channel selector based on the existing acquisition system was proposed, designed, processed, and manufactured, and it was debugged, tested, and applied in a no-load centrifugal test, static pressure model test, and centrifugal model test. The results show that the acquisition mode of the multi-channel selector connected with a maximum of 288 sensors has been changed from “one-to-one” to “one-to-many”. Its influence on various sensor signals is negligible. The multi-channel selector can work normally, which communicates and feeds back with the remote controller in the 1–120 g no-load centrifugal test. In the static load model test, 162 sensor signals were well collected through it. And only 51 channels were used to effectively obtain the signals of 187 sensors in a 70 g centrifugal model test of an anchoring slope with a frame beam. The multi-channel selector can be successfully applied in different use environments, saving time and reducing the cost of obtaining a single set of data.

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“…In addition, shield tunneling is often carried out in soft soil. Once the soil is disturbed, it is particularly easy to cause surface settlement and deformation of surrounding soil layers and upper pipelines [4][5][6]. is will greatly affect the stability of the existing comprehensive pipe gallery.…”

Section: Introductionmentioning

confidence: 99%

Effect of Subway Excavation with Different Support Pressures on Existing Utility Tunnel in Xi’an Loess

Yang

et al. 2020

Advances in Civil Engineering

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The interaction between two shield tunnels and the integrated pipe corridor is complicated and still lacks understanding. This paper investigated the influence of the double-track subway construction on the deformation characteristics of the existing comprehensive pipe corridor based on numerical simulation on a case history in Xi’an, China. First, loess is a special kind of clayed soil. In the theoretical calculation of overburden earth pressure of shield tunnel, the loose earth pressure theory under the incomplete soil arching effect can be used for calculation when considering the soil arching effect. Then, in the loess area of Xi’an, the existing comprehensive pipe corridor is affected by the construction disturbance. The vertical displacement of the existing pipe corridor utility tunnel affected by different support pressures which considers the soil arch effect or not was extracted from the FEM. The results indicated that, in the case where the left and right lines are constructed at different times, the vertical displacement of the pipe gallery is affected by different support pressures. If the support pressure is small, the settlement will be large, and the uplift will be diminutive. According to the construction methods and supporting pressures of this article, shield tunnel construction will not damage the safety of the comprehensive pipe corridor.

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Centrifugal model tests on face failure of earth pressure balance shield induced by steady state seepage in saturated sandy silt ground

Cited by 111 publications

References 15 publications

Displacement response characteristics of different sand tunnel excavation faces under true triaxial loading

Displacement response characteristics of different sand tunnel excavation faces under true triaxial loading

Research on Application of Multi-Channel Selector in Centrifugal Model Test of Anchoring Slope by Frame Beam

Effect of Subway Excavation with Different Support Pressures on Existing Utility Tunnel in Xi’an Loess

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