Dynamic response and pile-soil interaction of a heavy-haul railway embankment slope reinforced by micro-piles

Dong, Junchen; Wu, Zhihui; Li, Xin; Chen, Hongyun

doi:10.1016/j.compgeo.2018.04.005

Cited by 26 publications

(4 citation statements)

References 45 publications

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“…The failure of the ferroelectric thin film is caused by the abnormal evolution of the ferroelectric single domain. The essential reasons for determining ferroelectric domains and domain flipping are the microstructure of ferroelectric thin films such as lattice defects, interface terminal types, and oxygen vacancies [15]. With the miniaturization and high integration of ferroelectric memory, the size of ferroelectric thin films in the thickness direction is close to the nanometer scale and the polarization/domain structure and evolution are increasingly restricted by the abovementioned factors.…”

Section: Response Characteristic Analysis Methodsmentioning

confidence: 99%

Dynamic Response Characteristics of the Electric Domain Structure of Ferroelectric Materials to the Surrounding Rock Structure of a Heavy‐Duty Railway with a Small‐Clearance Crossing Tunnel

Hao

Wang

2022

Journal of Nanomaterials

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At present, the world-wide heavy-haul transportation technology of cargo trains has developed rapidly. Heavy-haul railway transportation has received extensive attention due to its large capacity, high efficiency, and low transportation costs. In order to understand the role that ferroelectric materials can play in the dynamic response of a heavy-duty railway surrounding rock structures in crosstunnels, this article introduces the domain structure of ferroelectric materials, derives the calculation method of the dynamic response of the surrounding rock structure, simulates the dynamic response characteristics through the corresponding formula, and analyzes the changes of the heavy-duty railway in the presence and absence of water. The situation was analyzed. The research results found that the increase of axle load will increase the bending moment of the invert structure. When the axle load is 30 t, the V-class surrounding rock is the most unfavorable working condition and the bending moment value of the invert structure is the largest at this time. When the added value of contact pressure is generally around 6.5 kPa, the railway as a whole can maintain a stable state.

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Section: Response Characteristic Analysis Methodsmentioning

confidence: 99%

Dynamic Response Characteristics of the Electric Domain Structure of Ferroelectric Materials to the Surrounding Rock Structure of a Heavy‐Duty Railway with a Small‐Clearance Crossing Tunnel

Hao

Wang

2022

Journal of Nanomaterials

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“…Shen et al [13] investigated the settlement pattern of soft clay subgrade under cyclic principal stress rotation caused by high-speed train load. Fu et al [2] and Dong et al [14] investigated the dynamic characteristics of XCC pile-raft foundation under high-speed train loads and a heavy-haul embankment reinforced by micro-piles by model tests and 3D numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Zhu

et al. 2022

Applied Sciences

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In order to study the dynamic response characteristics of a pile-soil foundation when an adjacent tunnel exists, both model tests and numerical simulations were performed in this study. Taking the peak vibration acceleration, peak vibration velocity, and peak vibration displacement as the evaluation indexes of the dynamic response, the dynamic response of the pile-soil foundation with an adjacent tunnel under high-speed train loads is studied. A method of dividing the affected zones of the dynamic response based on the safety threshold is provided in this paper, which can evaluate the safety of the adjacent tunnel under the action of train load. Additionally, the effect of train speed on dynamic response is further analyzed. The results show that the dynamic response index inside the foundation decays significantly with increasing distance from the surface when the train load is applied, regardless of the presence or absence of the adjacent tunnel. Compared with an ordinary pile-soil foundation, the dynamic response indexes inside the foundation increase significantly when there is an adjacent tunnel. With the increase in the horizontal distance from the pile foundation, the distribution characteristics of the horizontal transverse direction of each dynamic response index inside the foundation change from a “wavy” distribution to a monotonically decreasing distribution. According to the safety threshold of vibration velocity, the foundation is divided into the hazardous affected zone, strongly affected zone, and weakly affected zone, and then the corresponding vibration reduction measures are adopted. With the increase in train speed, the effect of tunnel structure on the attenuation of dynamic response in a pile-soil foundation becomes more obvious.

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“…Subgrade is an essential component supporting the track structures; hence its quality directly determines the transportation efficiency, operation cost and safety of a railway line. Whereas, because of the increase in train speed, axle load and train formation density, embankment problems such as bearing failure, excessive deformation, lateral spread of embankment shoulders/ slopes and slope slip and instability impose an increasing influence on track performance and seriously affect the safety of the railway operation (Yang & Feng, 2013;Dong, Wu, Li, & Chen, 2018). Moreover, poorly performing subgrade results in high rates of track geometry degradation and promotes higher rates of wear and deterioration of the rails, sleepers, fasteners and other special track-works (Li, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…In this regard, a number of conventional treatment methods, e.g., micro-piles (Dong et al, 2018), jet-grouting columns (Alonso & Ramon, 2013), cement soil row piles (Xue, 2014), geogrids (Esmaeili, Naderi, Neyestanaki, & Khodaverdian, 2018), geocell (Leshchinsky & Ling, 2013), geotexiles (Fuggini, Zangani, Wosniok, Krebber, & Weigand, 2016) and grouting (Sabermahani, Esmaeili, & Neyestanaki, 2017) are employed for enhancing the railway embankments. However, these methods generally lead to traffic block, long construction period, environment pollution or large disturbance on the original embankment, and hence may cause enormous economic losses.…”

Section: Introductionmentioning

confidence: 99%

Additional Stress in Soil Embankments Subjected to a New Prestressed Reinforcement Device

Zhang

Leng

et al. 2019

Journal of Civil Engineering and Management

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Theoretical solutions were derived to calculate the additional stress/prestress in a newly-developed prestressed embankment (PE), and the diffusion characteristics of the prestress in a PE with a lateral pressure plate (LPP) having width of 0.9 m were clarified using the theoretical solutions and a 3D finite element analysis. The results show that (1) the application of the theoretical solutions requires the net spacing between the LPP and the embankment shoulder is greater than the LPP width; (2) the maximum prestress appears in the upper part of the loading area of a LPP, and the maximum and minimum prestresses present an order of magnitude difference at the shallow depth, but the difference attenuates and the prestress gradually tends to be uniform with increasing depth; (3) the prestress propagates to the core zones that mainly bear the train loads with certain peak stress diffusion angles, and the values for the analyzed case are 50° and 58° in the external regions of the LPP along the slope and longitudinal directions, respectively; and (4) a continuous, effective and relatively uniform prestressing protective layer with a prestress coefficient greater than 0.1 can be formed above the core zones when the LPP spacing is properly designed.

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Dynamic response and pile-soil interaction of a heavy-haul railway embankment slope reinforced by micro-piles

Cited by 26 publications

References 45 publications

Dynamic Response Characteristics of the Electric Domain Structure of Ferroelectric Materials to the Surrounding Rock Structure of a Heavy‐Duty Railway with a Small‐Clearance Crossing Tunnel

Dynamic Response Characteristics of the Electric Domain Structure of Ferroelectric Materials to the Surrounding Rock Structure of a Heavy‐Duty Railway with a Small‐Clearance Crossing Tunnel

Dynamic Response of Pile-Soil Foundation with an Adjacent Tunnel under the High-Speed Train Loads: A Case Study

Additional Stress in Soil Embankments Subjected to a New Prestressed Reinforcement Device

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