Influence of Structural Shape on Earth Pressure for High‐Filled Cut‐and‐Cover Tunnel with and without Load Reduction Based on Discrete Element Method

Li, Sheng; Zhao, Liangliang; Ho, I-Hsuan; Gui-xia, Ning; Yu, Bin; Wang, Changdan

doi:10.1155/2020/8877873

Cited by 3 publications

(2 citation statements)

References 34 publications

(35 reference statements)

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“…Various types of culverts, such as box culvert [8,[18][19][20][21][22], arch culvert [23], tubular culvert [24][25][26][27][28], and cover culvert [29] have been evaluated. For HFCCT, the influence of the slope angle [30] and vector height of arch HFCCT [31] on earth pressure has been studied. e above studies found that the cross section type of high-filled structure has a certain influence on earth pressure distribution around it.…”

Section: Introductionmentioning

confidence: 99%

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Optimization Effects of Load Reduction for Earth Pressure on High‐Filled Cut‐and‐Cover Tunnels Using the Discrete Element Method

Xia

et al. 2021

Advances in Civil Engineering

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In the Northwestern part of Loess Plateau of China, the ravine and valley are numerous; therefore, high-filled cut-and-cover tunnels (HFCCTs) play a major role in meeting traffic needs and creating a great deal of usable land. However, due to higher backfill soil, a high earth pressure is generated, which affects the safety of HFCCTs. To this end, using the discrete element method (DEM), three load reduction measures were introduced to evaluate HFCCT: the cross section types of HFCCT; the combination of optimized cross section type with load reduction using expanded polystyrene (EPS); and the combination of optimized cross section type with load reduction using the EPS and concrete wedge (CW). We evaluated changes in earth pressure of HFCCTs with reference to the density and laying position of EPS and the height as well as width of CW. Parametric DEM studies were performed to characterize these influential factors. It was found that different cross section types of HFCCT have a certain influence on earth pressure distribution, and load reduction effects of EPS were extremely obvious, resulting in a sharp drop in vertical earth pressure on top of HFCCT and a slight growth in lateral earth pressure on the sides of HFCCT. Moreover, installation of CWs reduced the VEP and LEP of HFCCT. These factors were also shown to exert important effects on load reduction mechanisms of HFCCT. Based on their influence on earth pressure of HFCCT from a macroscopic and microscopic view, optimal values for influential factors were derived.

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Section: Introductionmentioning

confidence: 99%

“…For culverts, studies have assessed load reduction and section shapes; however, for HFCCT, studies were intensively focused on load reduction and their influence on earth pressure with different section types [31].…”

Section: Introductionmentioning

confidence: 99%

Optimization Effects of Load Reduction for Earth Pressure on High‐Filled Cut‐and‐Cover Tunnels Using the Discrete Element Method

Xia

et al. 2021

Advances in Civil Engineering

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Method of Average Vertical Earth Pressure for HFCCTs Based on Differential Settlement

Li,

He,

et al. 2024

Arab J Sci Eng

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This paper presents a modified and simplified calculation method, taking into account the differential settlement between the soil columns surrounding the cut-and-cover. High-filled cut-and-cover tunnels (HFCCT) are usually subjected to high earth pressures above the top of the CCT due to an ultra-high backfill. However, the estimation methods for earth pressure above the top of CCT are ambiguous. Through the theoretical analysis of the average vertical earth pressure (AEP) at the top of the CCT, it is found that an additional earth pressure above the top of the overburden pressure is induced, and the magnitude is related to the differential settlement between interior and exterior soil columns. Thus, through a combined theoretical derivation and numerical analysis, a modified formula is proposed. The results show that the vertical earth pressure increment above the top of CCT can be linearly correlated to the differential settlement. In addition, the correlation needs to be calibrated by considering several effects on sites, such as slope angle, groove-width ratios, cross-sectional shape, and the type of backfill. The change in influencing factors has no effect on the function type of the p−δ fitting curve, but it will affect the coefficient k.

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Sensitivity Analysis of Influencing Factors of Underground Civil Air Defense Construction Vibration under Vehicle Load

Zhang

et al. 2022

Applied Sciences

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Grey correlation theory is an uncertainty analysis method, which can find the relevance of various factors studied through certain data processing in incomplete information and find the main influencing factors. In order to study the influence of vehicle load on the vibration of underground civil air defense construction, taking the civil air defense construction at the intersection of Zhongzhou Middle Road and Shachang South Road in Luoyang as the study subject, based on the field measured data, and using ANSYS to expand the working conditions, this paper studies the influence of such factors as elastic modulus of concrete, thickness of overburden layer, density of soil layer, elastic modulus of soil layer, vehicle speed, and vehicle mass on the vibration of the civil air defense construction through the grey correlation sensitivity analysis method. The field measurement and numerical simulation results show that the displacement, velocity, and acceleration values decrease gradually from the mid−span position of the roof to the wall. Displacement, velocity, and acceleration are important indexes for evaluating vibration. The grey correlation degree of the influencing factors of displacement and velocity from large to small is density of soil layer, vehicle mass, vehicle speed, elastic modulus of concrete, elastic modulus of soil layer, and thickness of overburden layer. The grey correlation degree of the influencing factors of acceleration from large to small is vehicle mass, layer of density of soil layer, vehicle speed, elastic modulus of concrete, elastic modulus of soil layer, and thickness of overburden layer. The grey correlation degree of soil layer density, vehicle mass and vehicle speed to displacement, velocity, and acceleration is 0.7951–0.9993, which indicates that their influence is significant. This study can provide reference for the design and construction of similar civil air defense constructions.

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Influence of Structural Shape on Earth Pressure for High‐Filled Cut‐and‐Cover Tunnel with and without Load Reduction Based on Discrete Element Method

Cited by 3 publications

References 34 publications

Optimization Effects of Load Reduction for Earth Pressure on High‐Filled Cut‐and‐Cover Tunnels Using the Discrete Element Method

Optimization Effects of Load Reduction for Earth Pressure on High‐Filled Cut‐and‐Cover Tunnels Using the Discrete Element Method

Method of Average Vertical Earth Pressure for HFCCTs Based on Differential Settlement

Sensitivity Analysis of Influencing Factors of Underground Civil Air Defense Construction Vibration under Vehicle Load

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