Traffic-Load-Induced Permanent Deformation of Road on Soft Subsoil

Chai, Jinchun; Miura, Norihiko

doi:10.1061/(asce)1090-0241(2002)128:11(907)

Cited by 304 publications

(119 citation statements)

References 6 publications

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“…Excess pore pressure and strain continue to develop with increasing number of cycles, thereby decreasing the bearing capacity of the subgrade and often inducing excessive differential settlement. Therefore, the accumulation of excess pore pressure and excessive plastic deformation of the subgrade under significant cyclic loading is always a major concern for highway pavements, railway tracks and airport runways (Yamanouchi et al 1975;Kutara et al 1980;Li and Selig 1996;Chai and Miura 2002).…”

Section: Introductionmentioning

confidence: 99%

Model of Soft Soils under Cyclic Loading

Indraratna

Geng

et al. 2015

Int. J. Geomech.

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This paper presents a new constitutive model for cyclic loading of soil to predict the behavior of soft clays under undrained cyclic triaxial loading. It is inspired by the modified Cam-clay theory, and a new yield surface for elastic unloading is proposed to capture the soil behavior under cyclic loading. Only two additional parameters that characterize the cyclic behavior are used together with the traditional parameters associated with the modified Cam-clay constitutive model. The details of the relevant soil properties, initial states, and cyclic loading conditions are presented, and a computational procedure for determining the effective stresses and strains is demonstrated. The new model is used to simulate cyclic triaxial tests on kaolin, and the model predictions are generally found to be in agreement with the measured excess pore pressures and axial strains. Furthermore, numerous factors that influence the cyclic performance of soft soils can be considered in the new model, such as cyclic stress ratios, preshearing, and cyclic loading frequency. The critical cyclic stress ratio is also predictable using the proposed model in terms of excess pore pressures and axial strains. and the model predictions are generally found to be in agreement with the measured excess pore pressures and axial strains. Furthermore, numerous factors which influence the cyclic performance of soft soils can be considered in the new model, such as the cyclic stress ratios, pre-shearing, and cyclic loading frequency. The critical cyclic stress ratio is also predictable using the proposed model in terms of the excess pore pressures and axial strains.

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Section: Introductionmentioning

confidence: 99%

Model of Soft Soils under Cyclic Loading

Indraratna

Geng

et al. 2015

Int. J. Geomech.

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“…The former does not affect the post-construction settlement but the latter contributes to the tunnel settlement. By a preliminary study, the relationship between the soft soil deformation and the train load is derived [9] as:…”

Section: B Load Factors Of Train Operationmentioning

confidence: 99%

Investigation of Soft Soil Subway Tunnel Subsidence Based on Multiple Factors

Liu¹,

Tang²,

Zhao³

et al. 2014

Proceedings of the 2014 International Conference on Mechatronics, Control and Electronic Engineering

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Abstract-Objective: the subsidence of soft soil subway tunnel structure is a key threat to the safe operation of subway system. In order to detect and respond the problems timely, it is necessary to constantly monitor the subsidence of soft soil subway tunnel structure and to analyze its variation over time. Methods: a subway tunnel is buried in the ground and is usually in operation all the time, making it difficult to use common methods of monitoring the deformation of the tunnel structure. This difficulty can be overcome by deploying sensors. In this study, based on the characteristics of soft soil subway tunnel subsidence, data of various influencing factors have been monitored. According to the principal component analysis and the qualitative analysis of different factors, a mathematical relationship was derived between each influencing factor and soft soil subway tunnel subsidence. By applying principal component analysis from both time and space, the degree of influence of each factor was analyzed both qualitatively and quantitatively. Results: the results accurately showed the influence of different factors in the process of subway tunnel subsidence. Conclusion: this study shows that the use of sensors could be a practical and effective method to monitor the settlement of soft soil subway tunnel.

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“…However, a further %60 mm developed over the first 8 months of service and an additional 180 mm over 18 years of operation (Xiao et al, 2014). While incomplete consolidation and creep under embankment fill may have contributed to these settlements, Chai & Miura (2002) postulated that settlements may have been exacerbated by cyclic loading from road, rail or aircraft wheels. This note describes laboratory experiments on K 0 -consolidated samples of intact soft clay sampled near Wenzhou, southeast China, to explore whether their response to cyclic traffic wheel loading can explain the observed settlement trends.…”

Section: Introductionmentioning

confidence: 99%

Stress–strain response of soft clay to traffic loading

et al. 2017

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Approximately 25% of China's 120 000 km of expressway, as well as many new metro lines and airports, rest on soft clay deposits. However, service settlements are proving larger than expected, especially in southeast China. This note describes laboratory experiments on K 0 -consolidated intact samples of soft clay taken near Wenzhou, south-east China, that explore whether cyclic traffic wheel loading contributes significantly to the observed settlement trends. Cyclic triaxial (CT) tests are reported together with cyclic hollow cylinder (CHCA) experiments that imposed cardioid-shaped 2τ zθ À (Δσ z À Δσ θ ) stress paths. Cyclic principal stress axis rotation is shown to have an important influence on vertical straining. Once a certain threshold has been exceeded, the resilient and permanent strains developed in the CHCA tests become progressively larger than their counterparts in CT tests conducted at the same vertical cyclic stress ratio, with trends that diverge progressively as vertical cyclic stress ratio increases. Critical cyclic stress ratios can be defined that divide the response into (a) stable, (b) metastable and (c) unstable cyclic ranges. The novel experimental approach and high-quality data reported should aid practitioners and modellers in developing new analyses to address this economically significant geotechnical problem.

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Traffic-Load-Induced Permanent Deformation of Road on Soft Subsoil

Cited by 304 publications

References 6 publications

Model of Soft Soils under Cyclic Loading

Model of Soft Soils under Cyclic Loading

Investigation of Soft Soil Subway Tunnel Subsidence Based on Multiple Factors

Stress–strain response of soft clay to traffic loading

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