An Energy Solution for Predicting Buried Pipeline Response Induced by Tunneling Based on a Uniform Ground Movement Model

Shi, X.; Rong, Chuanxin; Cheng, Hua; Cui, Linzhao; Kong, Jie

doi:10.1155/2020/7905750

Cited by 8 publications

(9 citation statements)

References 25 publications

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“…As the capital city of Anhui Province in southeastern China, Hefei has multiple subway lines under simultaneous construction. e impact assessment of subway construction on the surrounding environment is particularly important [24]. ere are few studies on the PIP excavation in this area, and it is hoped that the results of this study will provide guidance for the follow-up subway construction.…”

Section: Introductionmentioning

confidence: 95%

Analysis on Deformation and Stress Characteristics of a Multibraced Pit‐in‐Pit Excavation in a Subway Transfer Station

Shi

Rong

Cheng

et al. 2020

Advances in Civil Engineering

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As an important part of subway transfer station construction, pit-in-pit (PIP) excavation has always been a key object of monitoring and control. In this study, taking the PIP excavation project of Hefei metro line 4 and line 7 transfer station as the background, combined with on-site monitoring and numerical simulation, the variation law of lateral wall displacement, ground surface settlement, and strut force during the PIP excavation were analyzed. The results showed that the maximum lateral deformation of the pile caused by the excavation of the external pit accounted for 80%–90% of the total deformation and the surface settlement accounted for 70% of the total settlement. The excavation of the inner pit only made the maximum lateral wall displacement of the outer pit and the surface settlement behind the wall increase slightly, the growth rate tended to zero, and the maximum lateral deformation depth was all above the excavation surface, which indicated that, for this project, the inner excavation had little effect on the outer pit retaining structure. In addition, the increased exposure time of the soil at the bottom of the pit and the presence of the corner effect will cause the further development of the structure displacement and the surface settlement. Based on strut force measurements, using the tributary area load distribution procedure, it was obtained that 0.3γHe was used as the upper limit index of strut force in the region, where γ is the weight of the soil and He is the excavation depth of the foundation pit. The research conclusions were helpful for the construction and sustainable development of the PIP project.

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Section: Introductionmentioning

confidence: 95%

Analysis on Deformation and Stress Characteristics of a Multibraced Pit‐in‐Pit Excavation in a Subway Transfer Station

Shi

Rong

Cheng

et al. 2020

Advances in Civil Engineering

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“…Therefore, it is not rare to find an excavation that is adjacent to preexisting subway tunnels, piles, pipelines, or other shallowly buried facilities [1][2][3][4][5]. Inevitably, the adja-cent excavation has an adverse effect on the constructed structures or facilities, and many studies have focused on this issue in recent decades [6][7][8]. It has been found that the excavation-induced redistribution of ground stress can lead to the generation of additional stress and deformation in the tunnel structure.…”

Section: Introductionmentioning

confidence: 99%

Predicting Response of Constructed Tunnel to Adjacent Excavation with Dewatering

et al. 2021

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This paper proposes a new method for predicting the displacement and internal force of constructed tunnels induced by adjacent excavation with dewatering. In this method, the total excavation-induced additional stress on the constructed tunnel is derived by superposing the additional stresses induced by excavation unloading and dewatering effects. The additional stress induced by unloading effect is calculated using Mindlin’s solution. The additional stress induced by dewatering effect is calculated using the principle of effective stress and the Dupuit precipitation funnel curve. With the beam on elastic foundation method, the total additional stress is then used for calculating the tunnel displacement and internal force caused by adjacent excavation with dewatering. Based on three well-documented case histories, the performance of the proposed method is verified. Moreover, a parametric analysis is also performed to capture the effects of excavation depth, tunnel-to-excavation distance, initial water level, excavation plan view size, and specific yield on the responses of the constructed tunnels. The results indicate that the effect of excavation depth on the tunnel maximum vertical displacement, maximum bending moment, and maximum shear force is more significant at an excavation depth greater than the cover depth of the constructed tunnel. The tunnel maximum vertical displacement, maximum bending moment, and maximum shear force decrease nonlinearly with an increase in the tunnel-to-excavation distance and the initial water level. Among the investigated parameters, the excavation dimension in the tunnel longitudinal direction affects most the tunnel responses. The effect of specific yield on the tunnel displacement and internal force induced by adjacent excavation with dewatering becomes more obvious as increasing the initial water level and excavation depth.

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“…Based on the equivalent soil shear strain proposed by Marshall et al [11], Klar et al [12] solved the difficult problem of determining relative pipeline-soil displacement and offered the procedure for calculating the maximum bending moment of pipelines caused by tunneling by considering soil nonlinearity. Based on the Pasternak model and a uniform ground movement model, an energy solution for predicting buried pipeline response induced by tunneling was proposed by Shi et al [13]. Multiple research methods were applied by Zhang et al [14], who investigated the interaction mechanism between an existing pipeline and quasirectangular tunneling in clays.…”

Section: Introductionmentioning

confidence: 99%

An Investigation of Effects and Safety of Pipelines due to Twin Tunneling

Shao

Lan²,

Luo

et al. 2021

Advances in Civil Engineering

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To efficiently and accurately predict the effects of twin tunneling on adjacent buried pipelines, the effects of upward and downward relative pipeline-soil interactions were considered. A series of numerical parametric studies encompassing 8640 conditions were performed to investigate the responses of a pipeline to twin tunneling. Based on the dimensionless analysis and normalized calculation results, the concept of equivalent relative pipeline-soil stiffness was proposed. Additionally, expressions for the relative pipeline-soil stiffness and relative pipeline curvature and for the relative pipeline-soil stiffness and relative pipeline settlement were established, along with the related calculation plots. Relying on a comparison of prediction results, centrifuge model test results, and field measured results, the accuracy and reliability of the obtained expressions for predicting the bending strain and settlement of adjacent buried pipelines caused by twin tunneling were validated. Based on the calculation method, the maximum bending strain and maximum settlement of pipelines can be calculated precisely when the pipeline parameters, burial depth, soil parameters, and curve parameters of ground settlement due to tunneling are provided. The proposed expressions can be used not only to predict the maximum bending strain and maximum settlement of pipelines caused by single and twin tunneling but also to evaluate the effects of single and twin tunneling on the safety of existing buried pipelines. The relevant conclusions of this article can also provide a theoretical basis for the normal service of buried pipelines adjacent to subway tunnels.

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An Energy Solution for Predicting Buried Pipeline Response Induced by Tunneling Based on a Uniform Ground Movement Model

Cited by 8 publications

References 25 publications

Analysis on Deformation and Stress Characteristics of a Multibraced Pit‐in‐Pit Excavation in a Subway Transfer Station

Analysis on Deformation and Stress Characteristics of a Multibraced Pit‐in‐Pit Excavation in a Subway Transfer Station

Predicting Response of Constructed Tunnel to Adjacent Excavation with Dewatering

An Investigation of Effects and Safety of Pipelines due to Twin Tunneling

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