Coupled Effect of Cross-Sectional Shape and Load Reduction on High-Filled Cut-and-Cover Tunnels Considering Soil–Structure Interaction

Li, Sheng; Han, Guo‐Zhi; Ho, I-Hsuan; Wang, Qicai; Yu, Bin

doi:10.1061/(asce)gm.1943-5622.0001696

Cited by 20 publications

(10 citation statements)

References 39 publications

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“…In turn, the stress redistribution induces further cycles of soil's primary consolidation and creep. Analysis of the PFC2D simulation results shows that, when the creep of the backfill soil is not considered, the variations in VEP and vertical displacement are consistent with previous research results (Li et al 2019a, b;2020a, b, c).…”

Section: Discussionsupporting

confidence: 89%

“…The construction of high-filled cut-and-cover tunnels (HFCCTs) in this area is able to satisfy transportation demands and create usable land. Several studies have been conducted on relating to the design of HFCCTs especially on the earth pressures sustained by them (Li et al 2019a, b;2020a, b, c;Ma et al 2020), but researchers have not focused enough attention on the creep characteristic of backfill soil of HFCCTs. The backfill soil of HFCCTs is placed over a short time compared to natural soil that has been sedimenting for millions of years, and thus, such backfill soil experiences significant consolidation and creep.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Time-Dependent Soil Behavior Above High-Filled Cut-and-Cover Tunnels Using Discrete Element Method

Han

et al. 2022

Geotech Geol Eng

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In the Northwest Loess Plateau of China that is full of mountains and deep valleys, high-filled cut-and-cover tunnels (HFCCTs) not only satisfy transportation demands, but they create usable land as well. Several studies have been conducted to investigate the feasibility of HFCCTs, but the time-dependent behavior of the significant backfill needed for HFCCTs has not been adequately examined. Settlement can be severely underestimated due to the time-dependent behavior of ultra-high backfill, and the earth pressure becomes redistributed accordingly.Therefore, the ability to predict the long-term behavior of backfill on HFCCTs is necessary to ensure the long-term safety of the structure. Using a discrete element method (DEM), the changes in vertical earth pressure (VEP), vertical displacement, and load transfer mechanisms above an HFCCT were investigated in this study under scenarios with and without considering backfill creep.The results show that the differential displacement of the soil and the surface settlement obviously increase due to creep and the subsequent cycles of primary and secondary consolidation. Moreover, the stress surrounding the HFCCT is redistributed, causing both the stress concentration and slope effect to weaken over time, but the VEP increases significantly. The micromechanical parameters also change correspondingly. Our results clearly show that the creep of high backfill soil must be considered carefully in HFCCT projects to ensure structural safety.

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Section: Discussionsupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Analysis of Time-Dependent Soil Behavior Above High-Filled Cut-and-Cover Tunnels Using Discrete Element Method

Han

et al. 2022

Geotech Geol Eng

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“…Effects of EPS characteristics (density and laying position) on load reduction on HFCCT were analyzed. Regarding EPS characteristics, the most favorable values of thickness and width were selected [15], which were 0.15 m and 0.3 m, respectively.…”

Section: Effects Of Expanded Polystyrenementioning

confidence: 99%

“…Geosynthetics have also been shown to play a certain role in load reduction on underground pipelines by Zheng et al [10], Ahmed et al [11], and Naggar et al [12]. Based on the theory of culvert load reduction, Li et al [13][14][15][16][17] performed a series of studies on load reduction in HFCCT so as to inform effective load reduction measures and evaluate various factors affecting soil arch effects of HFCCT.…”

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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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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“…For HFCCTs, several studies have mainly focused on load reduction. Few studies have been conducted on changes in earth pressure when the shape of the CCT structure is different [43]. us, in this paper, the particle flow code two-dimensional (PFC2D) software was used to analyze the distribution of vertical earth pressure (VEP) above the CCT, vertical displacement above the CCT, and distribution of lateral earth pressure (LEP) on the side of the CCT with different structural shape, regardless of whether load reduction above the CCT was used or not.…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

et al. 2020

Advances in Civil Engineering

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In the construction of the Loess Plateau in China, high-filled cut-and-cover tunnels (HFCCTs) had solved the problem of the shortage of land resources. However, this type of structure has a large amount of backfill soil, which leads to the problems of ultrahigh earth pressure and safety of the cut-and-cover tunnels (CCTs) lining structure. Previous studies have focused on the load reduction of various flexible materials, ignoring the influence produced by the shape of the CCT structure on the load reduction. Therefore, via a discrete element software, we investigated the changes of vertical earth pressure (VEP), vertical displacement, lateral earth pressure (LEP), and load transfer mechanisms around a HFCCT with consideration to two cases: (1) different shape of CCT structure; (2) the coupling of load reduction using expanded polystyrene (EPS) and the modified shape of the CCT lining structure. The results obtained by the discrete element method (DEM) revealed that an appropriate structural shape influenced the reduction of the VEP above the CCT and that the coupled effects of the load reduction using the EPS and shape modifications of the CCT lining structure could significantly reduce the VEP above the CCT, which enhanced the safety of the CCT. Meanwhile, the optimal values for the shapes of CCTs are derived.

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Coupled Effect of Cross-Sectional Shape and Load Reduction on High-Filled Cut-and-Cover Tunnels Considering Soil–Structure Interaction

Cited by 20 publications

References 39 publications

Analysis of Time-Dependent Soil Behavior Above High-Filled Cut-and-Cover Tunnels Using Discrete Element Method

Analysis of Time-Dependent Soil Behavior Above High-Filled Cut-and-Cover Tunnels Using Discrete Element Method

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

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

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