System safety assessment with efficient probabilistic stability analysis of engineered slopes along a new rail line

Wang, Tengfei; Luo, Qiang; Li, Zhengtao; Zhang, Wensheng; Chen, Weihang; Wang, Liyang

doi:10.1007/s10064-021-02555-1

Cited by 8 publications

(3 citation statements)

References 42 publications

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“…As shown in Figure 4, the vibration frequency of the subgrade under the train load is concentrated in the 0-50 Hz range, the vibration energy at the peak value is relatively large, reflecting the load action frequency of the train, and the peak value is mainly concentrated in the 20-40 Hz range. At different speeds, the soil response frequency has two peaks, verifying the double-peak phenomenon of the dynamic response of the highspeed railway subgrade mentioned in the literature [5]. The excitation frequencies all move to the high frequency direction with the increase in speed, and the energy corresponding to the peak value increases.…”

Section: Train Excitation Frequencysupporting

confidence: 75%

“…Through the real-time monitoring of parameters, such as settlement deformation and horizontal displacement of adjacent structures, timely engineering measures can be carried out according to the monitoring to ensure the stability of structures during construction [2][3][4]. System safety assessment can be performed through efficient probabilistic stability analysis of engineering slopes along new railway lines [5]. The author carried out deformation monitoring of the existing line foundation, mainly based on the horizontal displacement and lateral stress changes, on the Shanghai-Nanjing Intercity Railway Project [6].…”

Section: Introductionmentioning

confidence: 99%

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Research on Dynamic Response and Construction Safety Countermeasures of an Adjacent Existing Line Foundation under the Influence of a New Railway Line

Zuo

et al. 2022

Coatings

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The excavation of a new high-speed railway causes the side slope adjacent to the existing line foundation to become airborne, and the excessive dynamic deformation or cumulative deformation caused by the dynamic load of trains will affect the normal service of the subgrade, even leading to its instability. To date, there are no relevant experimental data regarding this, and there is also a lack of corresponding specifications. The only available numerical simulation research results need to be verified in practice. Therefore, this study relies on the Shanghai–Nanjing intercity high-speed railway construction project adjacent to the existing Beijing–Shanghai line to carry out a subgrade dynamic response test to ensure the safe operation of the existing line. The test obtained the vibration displacement, frequency, acceleration, and other parameters of the existing subgrade construction in three stages: subgrade excavation, pile formation, and subgrade filling. From the test results: During the test period, the vertical surface vibration displacement and vibration acceleration have a certain attenuation along the depth direction. In the stage of subgrade excavation, the vibration displacement and vibration acceleration generated are the largest. The vertical vibration displacement amplitude reaches 1.9 mm, and the horizontal vibration displacement amplitude reaches 0.15 mm. The vibration frequency of the roadbed under the action of the train load is concentrated in the range of 0–50 Hz, and the vibration energy at the peak value is relatively large, which reflects the load action frequency of the train, and the peak value is mainly concentrated in the range of 20–40 Hz. These results show that the maximum vibration response peak appears in the subgrade excavation stage, that is, the most dangerous stage of the existing subgrade. The vibration acceleration and vibration displacement of each dynamic response parameter are important in that they reflect the dynamic performance of the subgrade and establish the index control standard, which can be used as a control index for roadbed dynamic stability monitoring. The dynamic test of the subgrade state provides data support for the reasonable opening of the construction skylight and the protection of the excavation slope. Taking into account the impact of piling vibration, technical measures such as static pressure, jumping construction, and setting up stress relief holes are adopted. The test results and engineering measures ensure the safe operation of the existing subgrade, and have important theoretical significance for guiding the construction of the new subgrade adjacent to the existing line.

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Section: Train Excitation Frequencysupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Research on Dynamic Response and Construction Safety Countermeasures of an Adjacent Existing Line Foundation under the Influence of a New Railway Line

Zuo

et al. 2022

Coatings

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“…Additionally, groundwater table variations could have considerable impact on the slope stability due to its time domain [22,23]. Another way to improve the performance of railway embankment slopes is to examine the quantitative relationships between parameters regulating safety coefficients [24]. Technically, this requires examining the effect of changes in each hydromechanical parameter on the safety factor and knowledge about their dominating roles in stability analysis [25].…”

Section: Introductionmentioning

confidence: 99%

Prediction of Railway Embankment Slope Hydromechanical Properties under Bidirectional Water Level Fluctuations

Aliyu,

Xu,

Bello

et al. 2024

Applied Sciences

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Railway embankment slopes are exposed to natural hazards such as excess rainfall, floods, earthquakes, and lake water/groundwater level variations. These are generally considered during the design, construction, and maintenance periods of the embankment. In this study, combined laboratory test methods and a computational approach were applied to assess the effect of groundwater level changes on the railway embankment. The Plackett–Burman (PBD), Box–Behnken design response surface methodology (BBD-RSM), and an artificial neural network (ANN) were used to predict the behavior of the embankment soil hydromechanical properties to determine the integrity of the embankment as water level fluctuates under varied seasonal conditions. The results show that the seepage line is concave during the rising water level (RWL) period, and the railway slope’s static stability factor surges and then stabilizes. Further analysis found that the slope’s stability is largely affected by some of the hydromechanical properties of the soil embankment material, such as the internal friction angle (ϕ), soil density (ρs), and cohesion (c). The second-order interaction factors c x s, x s, and s2 also affect the stability factor. It was observed that the four most sensitive parameters under both falling water level (FWL) and RWL conditions are ϕ, ρs, c, and rate of fall/rise in water level (H). The statistical evaluation of the RSM model produced R2 values of 0.99(99) and 0.99, with MREs of 0.01 and 0.24 under both RWL and FWL conditions, respectively, while for ANN, they produced R2 values of 0.99(99) and 0.99(98), with MRE values of 0.02 and 0.21, respectively. This study demonstrates that RSM and ANN performed well under these conditions and enhanced accuracy, efficiency, iterations, trial times, and cost-effectiveness compared to full laboratory experimental procedures.

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Crystallization deformation and phase transitions of coarse-grained sulfate saline soils upon cooling

Wang

Liu

et al. 2023

Cold Regions Science and Technology

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System safety assessment with efficient probabilistic stability analysis of engineered slopes along a new rail line

Cited by 8 publications

References 42 publications

Research on Dynamic Response and Construction Safety Countermeasures of an Adjacent Existing Line Foundation under the Influence of a New Railway Line

Research on Dynamic Response and Construction Safety Countermeasures of an Adjacent Existing Line Foundation under the Influence of a New Railway Line

Prediction of Railway Embankment Slope Hydromechanical Properties under Bidirectional Water Level Fluctuations

Crystallization deformation and phase transitions of coarse-grained sulfate saline soils upon cooling

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