Experimental Study of the Behavior of Rectangular Excavations Supported by a Pipe Roof

Xie, Xuansong; Zhao, Mingrui; Shahrour, Isam

doi:10.3390/app9102082

Cited by 13 publications

(7 citation statements)

References 16 publications

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“…Second, because the deep foundation pit of this project is close to existing buildings and the main road of traffic, the surface settlement value generated in the construction process of shallow-buried excavation pile cutting should be controlled in order to reduce the impact of the construction on the surrounding environment. According to the previous construction experience and comprehensive consideration of the construction cost, the diameter of the pipe roof can be appropriately increased or the annular spacing of the pipe roof can be appropriately reduced [40,41]. ird, in order to ensure that the supporting structure still has enough stiffness after the pile cutting, a row of prestressed anchor cables can be installed above the pile cutting area or pile repair can be carried out on both sides of the pile cutting area before cutting piles.…”

Section: Suggestions For Working Conditions Of Cutting Supportingmentioning

confidence: 99%

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Zheng

Ren

et al. 2021

Advances in Materials Science and Engineering

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Partial supporting piles removal from deep foundation pit may lead to large-scale foundation pit collapse, resulting in severe consequences. Various studies have investigated the underpinning technology of cutting abutment piles by combining field monitoring and numerical simulation, but there are few studies on cutting supporting piles of foundation pit by the shallow excavation method. Taking an actual deep and large foundation pit as an example, the finite element method (FEM) was adopted to study the surface settlement and the changing trend of the force and displacement of the supporting pile caused by cutting piles during the shallow excavation of double tunnels. The FEM results were verified with the field monitoring data. The simulation results show that the surface settlement around the foundation pit mainly occurs at the pile cutting stage under different excavation sequences (0D, 1D, 2D), and the main distribution area is the one-fold diameter area outside the double tunnel. After the supporting piles are partially cut, the bending moment and displacement of the lower part of the broken piles differ significantly due to different excavation sequences, but the bending moment and displacement of the upper part of the broken piles are basically similar. In the process of removing the supporting piles, the Earth pressure behind the piles is redistributed, and the load is mainly transferred to the adjacent supporting piles outside the tunnel within the radius of one time of the tunnel diameter. However, the load is not evenly transferred to the adjacent supporting piles. Some recommendations for the reinforcement scheme of the supporting structure during cutting supporting piles in deep foundation pit are also proposed. The research results can provide theoretical basis and practical guidance for the construction of similar projects in the future.

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Section: Suggestions For Working Conditions Of Cutting Supportingmentioning

confidence: 99%

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Zheng

Ren

et al. 2021

Advances in Materials Science and Engineering

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“…Reduces soil settlement and the soil load [21] Geocell Reinforcement Reduces soil surface settlement, pipe displacement, and tension on the pipeline's crown [22] Expanded polystyrene (EPS) Geofoam Effectively reduces external earth pressures [23] Results of experimental work done by Mohammed Yousif Fattah et al [24] show that soil settlement is reduced by between 29% and 43% by using geocell reinforcement above buried pipes. Similarly, the latest research carried out by Xiongyao Xie et al [21] also shows the reduction in soil settlement and soil pressure using roof box jacking techniques. Further, the results of Shibu et al [25] show a 34% reduction in strain by using expanded polystyrene (EPS) geofoam over buried pipes.…”

Section: Roof Box Jackingmentioning

confidence: 99%

“…The temperature variation between a pipe's internal and external surfaces has more impact on its sustainability than the external environmental changes [15]. Further, external surface load such as traffic, heavy equipment, and superstructure built on the BCPs also impact its integrity [16][17][18][19][20][21][22][23][24][25]. Likewise, flood [26][27][28][29][30][31][32][33][34], blasting [35][36][37] and earthquakes [38][39][40][41][42][43][44] also affect the safe operations of BCPs.…”

Section: Introductionmentioning

confidence: 99%

Identification of Factors Influencing Sustainability of Buried Continuous Pipelines

Akram

Zülfikar

2020

Sustainability

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Threat to the sustainability of buried continuous pipelines (BCPs) can be associated with different factors such as corrosion, natural hazards, and third-party influences. In the past, these factors have been discussed independently by various researchers. Despite these studies, there is still space for a comprehensive review report to be performed in this domain. The purpose of this article is to manage, classify, and describe the literature work done in this sphere. Firstly, the screening of various factors based on their damage criteria has been carried out. An environmental analysis is performed to review the impact of different parameters that can influence the sustainability of BCPs. Further, a technical review on primary factors has been done to examine and measure the causes, damages, mitigation, and inspection techniques. In the last stage, review based decision has been performed. Results of the current study shows that research contribution for corrosion and earthquake factors are in an advanced stage, followed by flood and external surface loads, that are still in progress. However, temperature variations and blast factors are in a premature phase and need broad inspection and research support.

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“…Many scholars have carried out a considerable amount of research on the mechanical behavior of pipe roof excavation. Xie et al (2019a); Xie et al (2019b) studied the excavation mechanical properties of a pipe roof under a rectangular cross-section by the limit analysis method and found that the pipe roof plays an important role in reducing ground settlement and earth pressure. Wu et al (2018) found that the pipe roof can effectively reduce the settlement of the surface vault and the grouting can limit the development of a plastic zone by numerical simulation of the combined effect of pipe roof and rock grouting reinforcement.…”

Section: Introductionmentioning

confidence: 99%

Field test and numerical simulation of ground settlement in super shallow buried station excavation supported by transverse pipe roof

Wang

et al. 2023

Front. Earth Sci.

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The pipe roof is an effective means to control the surface settlement during the construction of the super-shallow buried subway station. The transverse pipe roof method can not only reduce the construction work surface, but also improve the construction efficiency by multi-stage flow construction. Based on the transfer station project of the Olympic Sports Center of Jinan Rail Transit Line 3, the ground settlement law caused by the excavation of ultra-shallow buried subway station under the action of transverse pipe roof is analyzed through field measurement. The mechanism of pipe roof controlling ground settlement and the influence of steel pipe spacing and steel pipe length on the bearing mechanism of pipe roof are analyzed by numerical simulation. The following conclusions are drawn. 1) The surface settlement curve caused by the excavation of the small pilot tunnel in the lateral direction of the station is a wavy U-shaped, and the surface settlement curve becomes a smooth U-shaped after the soil is broken. In the longitudinal direction of the station, the surface settlement is jagged, and the surface settlement above the pipe roof is less than the surface settlement between the pipe roofs. 2) After soil excavation, pipe roof can bear the load of surrounding rock and restrain the settlement of soil above, and soil arch effect is formed between pipes to restrain the relaxation of soil between pipes. With the increase of the spacing of the steel pipe, the height of the soil arch increases. After exceeding a certain spacing, the micro-soil arching effect disappears and the surface settlement increases. 3) The length and stiffness of pipe roof will affect the bearing capacity of pipe roof and there is an upper limit. When it exceeds the upper limit, increasing the length or stiffness of pipe roof has little effect on the control effect of ground settlement. The research can provide reference for shallow buried excavation station and other projects.

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Experimental Study of the Behavior of Rectangular Excavations Supported by a Pipe Roof

Cited by 13 publications

References 16 publications

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Effects of Partial Supporting Pile Removal from Deep Foundation Pits by Shallow Excavation Method in Loess Areas

Identification of Factors Influencing Sustainability of Buried Continuous Pipelines

Field test and numerical simulation of ground settlement in super shallow buried station excavation supported by transverse pipe roof

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