Performance evaluation of a surcharge preloading project based on back-analysis of field monitoring and numerical assessment

Alielahi, Hamid; Maleki, Mohammad H.; Mehrshahi, Khosrow

doi:10.1007/s12517-021-08529-7

Cited by 4 publications

(1 citation statement)

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“…Currently, numerical simulation methods for performing roadbed settlement calculations are divided into three main categories: nite element method, nite difference method, boundary element method, nite difference method and boundary element method.The nite element method is widely used in geotechnical engineering calculations because of its simple concept, easy to grasp, accurate results and other advantages.Li Junhong [36] used ABAQUS to simulate the effect of the depth of in uence of drainage strips on the consolidation of soft foundations; Alielahi et al [37] used Settle 3D software to simulate the effect of drainage strips with stacking pre-compression technology to improve the performance of foundations; Kazem et al [38] pointed out that if the parameters of the soil in the software of Settle 3D were chosen appropriately, it was possible to reasonably estimate the time of settling and consolidation.Luo [39] Simulation of vertical displacement of composite-amended loess roadbed along depth direction using MIDAS/GTS software.Auersch et al [40] established a numerical model of railroad track-roadbed and investigated the distribution law of the dynamic response inside the model of railroad track-roadbed. The distribution of dynamic response inside the track-roadbed model was investigated.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Tests and Numerical Simulation on the Loess Subgrade Improved by Lime-Lignin

Jia,

Zhang,

et al. 2023

Preprint

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Conventional techniques individually incorporating the inorganic or organic modifiers are insufficient to achieve the amelioration of loess roadbed in practices, which has restricted the development of infrastructures. This paper utilizes the lime-lignin to modify the loess, for which a series of mixing samples with various additives dosages (i.e. 0,2%:1%,4%:2%,6%:3% and 8%:4%) was adopted. Laboratory experiments and numerical simulation were carried out to investigate the mechanical properties of amended loess. Test results showed that both the compressive and shear strengths of the improved loess exhibit an initial rise followed by a decline as the contents of lime and lignin increase, with the optimal improvement effect achieved at a lime-to-lignin mixing content of 2%:1%. The results also indicated that numerical simulation can well corroborate the laboratory results, which are manifested in reduced roadbed settlements and favourable stress transfer mechanisms. An intricate three-dimensional network structure established by lignin fibers and a cement-soil skeleton formed between lime hydrate and soil particles jointly improve the strength of the soil matrix. The main research findings can offer valuable theoretical references for the enhancement of the loess subgrade.

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Section: Introductionmentioning

confidence: 99%