Mechanical analysis of soil arching under dynamic loads

Han Gaoxiao, Gong Quanmei, Zhou Shunhua

In the proceedings of: GEO2011: 64th Canadian Geotechnical Conference, 14th Pan-American Conference on Soil Mechanics and Geotechnical Engineering, 5th Pan-American Conference on Teaching and Learning of Geotechnical Engineering

Session: Other General

ABSTRACT: Soil arching is a common phenomenon in pile supported geosynthetic-reinforced or unreinforced embankments resting on soft soil. Due to soil arching, stress acting on soft soil or geosynthetic reinforcement decreases and stress on piles increases, this can reduce the settlement difference along the subgrade cross-section. Now most of the high-speed railway subgrades in soft soil area in China have been designed considering of the action of soil arching. But during the period of service life of the railway line, the subgrade will carry on high-cycle dynamic loads and when the subgrade is not high enough, the soil arching maybe influenced and the permanent deformation will increase. In this paper the properties of soil arching under dynamic loads have been investigated by performing numerical studies using the Discrete Element Method (DEM) and model experiments. In the numerical study, soil was modeled as particles using the linear contact stiffness model. The influence of the covering soil thickness and the dynamic loads amplitude were proposed in this paper.

RÉSUMÉ: L™effet de voûte est un phénomène courant dans la réalisation du terrassement type pieux de fondation ou type pieux et géotextile sur le sol compressible . Par son existence, la contrainte sur le sol compressible ou sur le matériel de renforcement est diminuée tandis que celle sur les pieux , augmentée , ce qui fait diminuer ainsi le tassement différentiel à la section transversale du terrassement .Actuellement , le Design en Chine tient en compte de l™effet de voûte pour la plupart de construction de terrassement TGV sur le sol compressible. Mais pour la ligne TGV pendant son exploitation , la déformation résiduelle du terrassement augmentera aussi sous l™action des charges dynamique de cycle lorsque ce terrassement a une hauteur relativement basse. Le présent texte présente une étude , menée avec la méthode DEM et le Model-Based Testing , sur la répatition des charges sous l™effet de voûte, son mode destructif , ainsi que l™impact de l™épasseur du remblai et de l™amplitude des charges dynamliques sur l™effet de voûte

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