Numerical Model of Widen Construct of Geogrid-Reinforced Pile-Supported Railway Embankment
Established a 3D detailed model to understand the loading features and deformation behavior of the geogrid-reinforced pile-supported (GRPS) high-speed railway embankment under the situations of normal service and widen construct. According to the model re
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Introduction There are obvious differences between the requirements of railway subgrade engineering and building engineering. The foundation soil is allowed to settle clearly during the construction period in the railway subgrade project. After most of the consolidation process completed and the bearing capacity of the foundation improved, the installation of track structure starts. But the post-construction settlement, which is required quite strictly to ensure the track smooth and safety. In China, there is large area of soft soil the Four Vertical and Four Horizontal high-speed railway network plan. The soft soil comprises mainly by clay mineral leading to low strength, high compressibility, poor permeability and long consolidation time. During the process of embankment filling, the filling height is limited at one time due to potential soil damage and the road may crack due to excessive settlement and differential settlement after the embankment is put into service [1–3]. When dealing with poor foundation consisted with plastic silt or mucky soil, the GRPS design is popular because this kind of embankment will control the settlement and differential settlement effectively [4, 5]. The pile-cap is selected to replace traditional raft saving the concrete amount and the shortened construction Period. The pile-caps are covered with high-strength geogrid to constrain lateral deformation. However the behavior of GRPS design is quite complex which’s load transfer mechanism mainly includes the soil arching effect and membrane effect of the geogrid and the interaction of piles and surrounding soil [6, 7]. The complexity of this kind of embankment limits theoretical analysis [8]. Y. Wang (&) X. Bian Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China e-mail: [email protected] X. Bian e-mail: [email protected] © Springer Nature Singapore Pte. Ltd. and Zhejiang University Press 2018 X. Bian et al. (eds.), Environmental Vibrations and Transportation Geodynamics, DOI 10.1007/978-981-10-4508-0_65
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PLAXIS provides abundant specialized geotechnical constitutive models and reliable results widely recognized in the international geotechnical engineering community. Therefore this paper intends to choose the finite element program PLAXIS 3D to study the railway embankment widening construction. The geogrid reinforced pile supported embankment is a three-dimensional problem. Considering the asymmetry of the construct and the limitation of the plane simplification, the 3D finite element analysis is carried out.
Establishment of Finite Element Model A length of high-speed railway is designed GRPS embankment structure. After track structure construction finished but before put into service, the railway is decided to get widen to contain four lines from two lines to better fit the high-speed network plan. In order to study the effect of the widening construction to the original lines, the numerical simulation method is used.
Engineering Geological Conditions The project is located
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