Study on Subgrade Settlement Characteristics After Widening Project of Highway Built on Weak Foundation

Yu, Heng; Wang, Yimin; Zou, Chao; Wang, Peng; Yan, Chao

doi:10.1007/s13369-017-2469-3

Cited by 42 publications

(18 citation statements)

References 9 publications

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“…The same conclusion was obtained by Kamash & Han (2014). Yu et al (2017) adopted a numerical analysis method to consider the influence of the factors on settlement of existing embankment, including layouts of cement-fly ash-gravel (CFG) piles, strengths of CFG piles and filling materials of the new embankment. Their results show that the lightweight filling material has more advantages in reducing the settlement of the existing embankment.…”

Section: Research Progress Of Embankment Separated Widening and Isolating Wallmentioning

confidence: 62%

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Jiang

et al. 2021

BJRBE

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In this paper, the typical cases of subgrade separated widening project in China are summarised. The research progress of subgrade separated widening and isolating wall applications are reviewed in highway reconstruction and extension. A numerical model is established based on the PLAXIS finite element software, considering both material nonlinearity and geometric nonlinearity. The effect mechanism of the isolating wall is discussed on the settlement control of the new and existing embankment on soft ground. The effect rule of the core design parameters of the isolating wall is revealed on the settlement disturbance of the existing embankment, such as location, depth, thickness and elastic modulus, and the weight rank of the influence is analysed. The results indicate that the isolating wall effectively reduces the lateral displacement and vertical settlement of the existing embankment, and there is an optimal design location for the isolating wall. In addition, with the increase of design parameters of the isolating wall, including depth, thickness and elastic modulus, the overall settlement of the existing embankment tends to be uniform, and there are optimal values. Furthermore, the depth of isolating wall is given priority, compared to location, thickness and elastic modulus during the isolating wall design process. The research results lay a theoretical foundation for the design optimisation of the isolating wall in the separated widening project of soft ground.

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Section: Research Progress Of Embankment Separated Widening and Isolating Wallmentioning

confidence: 62%

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Jiang

et al. 2021

BJRBE

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“…The grey prognostic model was suitable for time series with the feature of "small sample and poor information" [32]. The settlement of high fill subgrade not only has the grey characteristics of poor information and uncertainty, but also has the feature of nonlinearity and complexity [33]. The MGVM model could reflect the fluctuation law of sequence by determining the transfer law of sequence state, which could overcome the defect that the grey model cannot reflect the fluctuation of the data sequence and improve the prediction accuracy greatly.…”

Section: Discussionmentioning

confidence: 99%

Research on the Grey Verhulst Model Based on Particle Swarm Optimization and Markov Chain to Predict the Settlement of High Fill Subgrade in Xiangli Expressway

Liu

Guo

Zhang

et al. 2019

Mathematical Problems in Engineering

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It is of vital significance to accurately forecast the settlement of high fill subgrade, which is the foundation for disaster prevention and treatment of subgrade. According to the monitoring data of high fill subgrade, a novel model, called PSOMGVM model, based on particle swarm optimization (PSO) and Markov chain is proposed. Firstly, the typical characteristics of settlement curve are analyzed from the aspect of geomechanics theory and based on the grey theory, the grey Verhulst model (GVM) with unequal time-interval is proposed. Then, according to the theory of Markov chain, the grey Verhulst model is built to revise the relative residuals of the GVM, in which the effects of volatility characteristics can be considered. Finally, the PSOMGVM model based on PSO algorithm and Markov chain is set up, which whitens the parameters of the grey interval. In order to demonstrate the fitness and the ability of the proposed model, five competing models are introduced to predict the settlement of the high fill subgrade of Xiangli Expressway in Yunnan Province. Through the analysis of APE, MAPE, and RMSE, it states that the accuracy and performance of the PSOMGVM model outperform the other five competing models for simulative and predictive periods.

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“…In recent years, the widening of Chinese highways has gradually increased, which has caused a large number of secondary excavation projects on existing highslope highways [1,2]. The working conditions of bolts used as support measures for high slopes are a key issue in the study of secondary excavation stability [3].…”

Section: Introductionmentioning

confidence: 99%

Unload Pull-out Test of Full-length Grouted Bolts in Slope Reconstruction and Expansion

Guan¹,

Feng

Zhao

et al. 2021

J. Eng. Technol. Sci.

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The Unloading Pull-out Test Method (UPTM) is proposed to evaluate the residual stress of existing anchorage systems and explore the actual stable state of the slope before excavation. A series of destructive pull-out tests are applied to detect the working state of the existing rock bolts. The working load and ultimate load of the existing bolts are determined by field test measurement of the P-S curve. The experimental result showed that a displacement increment of the bolts was present in the elastic stage, the elastoplastic stage, the slip stage, and the debonding stage. The working load and the ultimate load were in the elastoplastic stage and the debonding stage respectively. The working load of the bolts is closely related to the sliding deformation. The ultimate load of the bolts, however, is only related to the design parameters, slope lithology and other factors. After 20 years of natural forces acting on the bolts in the slope, their ultimate bearing capacity had a stress loss of 24.0% ~ 32.0%.

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Study on Subgrade Settlement Characteristics After Widening Project of Highway Built on Weak Foundation

Cited by 42 publications

References 9 publications

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Design Optimisation Analysis of Isolating Wall for Separated Widening Embankment on Soft Ground

Research on the Grey Verhulst Model Based on Particle Swarm Optimization and Markov Chain to Predict the Settlement of High Fill Subgrade in Xiangli Expressway

Unload Pull-out Test of Full-length Grouted Bolts in Slope Reconstruction and Expansion

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