Analysis of influence factors on end soil reinforcement effect of rectangular pipe jacking

Sun, Yang; Xu, Zhenyang; Li, Ang; Wang, Chongxiao

doi:10.1680/jgeen.21.00004

Cited by 4 publications

(3 citation statements)

References 9 publications

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“…It must be considered that range analysis can directly analyze the impact of test factors on the results, but ignores the impact of error [ 36 ]. To better analyze test results, data-analysis software SPSS was employed to conduct variance analysis on the results.…”

Section: Resultsmentioning

confidence: 99%

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

et al. 2022

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Construction of high-speed railway subgrade on loess soils in the Loess Plateau is risky because such soil is susceptible to differential settlements. Various soil-improvement methods have been used to enhance the mechanical properties of loess. Lime-ash soil and cement-lime soil are the most commonly used methods in the improvement of loess subgrade, while few studies have been found on loess subgrade improvement by using composite material consisting of traditional materials and new materials. A series of direct shear tests and unconfined compressive tests were conducted on the loess specimen with the addition of three kinds of composite materials: traditional material cement, new material polypropylene fiber and SCA-2 soil curing agent. The numerical simulation was conducted on loess subgrade in an actual engineering practice. The experimental results show that cement, polypropylene fiber and SCA-2 soil curing agent can effectively improve the shear strength and compressive strength of loess, and the influence degree is cement > fiber > curing agent. Additionally, based on the relative strength characteristics of the improved loess, an optimal improvement scheme for the composite-material-modified loess was obtained: 16% cement content + 0.5% fiber content + 4% curing agent content. The numerical simulation results revealed that the compressive strength index of the improved loess has a significant impact on the subgrade settlement, and the optimal improvement scheme obtained from comprehensive analysis can effectively improve the settlement of high-speed railway subgrade under vibration load.

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Section: Resultsmentioning

confidence: 99%

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

et al. 2022

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“…This technology has undergone rapid development in China despite its relatively late introduction in the country. With the increase need for developing and utilizing underground spaces in urban areas, rectangular pipe jacking technology has been widely employed in diverse applications, such as urban underground pedestrian crossing tunnels [1], entrance tunnels of subway stations D], municipal underground roads and railways [4][5][6], and utility tunnels [7][8][9]. Rectangular jacked pipe tunnels often feature large cross section to satisfy the demands of expressways and large traffic volumes.…”

Section: Introductionmentioning

confidence: 99%

“…Rectangular jacked pipe tunnels often feature large cross section to satisfy the demands of expressways and large traffic volumes. For example, the width of a pipe used for a project in Zhengzhou exceeded 10 m [1], while in Jiaxing, it astonishingly reached 14.8 m [10].…”

Section: Introductionmentioning

confidence: 99%

Field research on supersized rectangle pipe-jacked tunnels beneath a navigable river in the urban area

Fang,

Jiang,

Gao

2024

IOP Conf. Ser.: Earth Environ. Sci.

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With technological progress in recent years, supersized rectangular jacked pipe tunnels have been increasingly used for developing urban road-crossing nodes, owing to their convenient construction and economic benefits. However, owing to the weak waterproofing performance of the joint, jacked supersized rectangular pipes have been employed beneath a navigable river. This study used on-site monitoring data of an underground expressway with supersized rectangular jacked pipe tunnels in Shanghai. Additionally, we analyzed the deformation of the ground surface and embankment and the mutual influence of jacked adjacent pipes. The results revealed the following. 1) the over-excavation of the jacked pipe causes partial surface subsidence. The jacking parameters were adjusted through feedback to control the surface deformation. 2) The spatial deformation of the old embankment were stabilized, suggesting the successful realization of micro-disturbance jacking construction. 3) The secondary disturbance of the soil due to post-construction causes a slight sinking and tilting trend of the former jacked tunnel.

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Deformation mechanism and limit support pressure of cutting steel plate during connection between pipes in large spacing using pipe curtain structure method

Liu,

Zhang,

Huang

et al. 2024

Underground Space

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Analysis of influence factors on end soil reinforcement effect of rectangular pipe jacking

Cited by 4 publications

References 9 publications

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

Field research on supersized rectangle pipe-jacked tunnels beneath a navigable river in the urban area

Deformation mechanism and limit support pressure of cutting steel plate during connection between pipes in large spacing using pipe curtain structure method

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