Optimal mixing ratio and SWCC fitting of lightweight soil with cotton stalk fibres

Ren, Wenyuan; Tao, Yang; Huang, Minmin; Zhang, Aijun; Wei, Hanlin; Mi, Wenjing; Wang, Yuguo; Hu, Jinnan

doi:10.1016/j.sandf.2021.01.004

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…The content of materials is controlled by the ratio of the materials amount to the dry loess amount. The orthogonal test method was used to design the test scheme, which can discuss the influence of each test factor on the strength index under the premise of lower test quantity [ 34 ]. L 25 (5 6 ) orthogonal table was adopted in this test, and there were 25 combination ratio schemes ( Table 4 ).…”

Section: Methodsmentioning

confidence: 99%

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

et al. 2022

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Construction of high-speed railway subgrade on loess soils in the Loess Plateau is risky because such soil is susceptible to differential settlements. Various soil-improvement methods have been used to enhance the mechanical properties of loess. Lime-ash soil and cement-lime soil are the most commonly used methods in the improvement of loess subgrade, while few studies have been found on loess subgrade improvement by using composite material consisting of traditional materials and new materials. A series of direct shear tests and unconfined compressive tests were conducted on the loess specimen with the addition of three kinds of composite materials: traditional material cement, new material polypropylene fiber and SCA-2 soil curing agent. The numerical simulation was conducted on loess subgrade in an actual engineering practice. The experimental results show that cement, polypropylene fiber and SCA-2 soil curing agent can effectively improve the shear strength and compressive strength of loess, and the influence degree is cement > fiber > curing agent. Additionally, based on the relative strength characteristics of the improved loess, an optimal improvement scheme for the composite-material-modified loess was obtained: 16% cement content + 0.5% fiber content + 4% curing agent content. The numerical simulation results revealed that the compressive strength index of the improved loess has a significant impact on the subgrade settlement, and the optimal improvement scheme obtained from comprehensive analysis can effectively improve the settlement of high-speed railway subgrade under vibration load.

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Section: Methodsmentioning

confidence: 99%

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

et al. 2022

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“…Soil structure will be rapidly destroyed, and soil will subside under sufficient pressure, rapidly reducing soil strength [20][21]. The collapsible deformation of loess subgrade when water-logged could lead to unacceptable deformations in loess areas [22]. Pore distribution and the micro rule of the collapsible loess in Lanzhou, however, have rarely been analyzed using SWCCs.…”

Section: Introductionmentioning

confidence: 99%

Soil-Water Characteristic Curves and Fitting Models of Collapsible Loess: A Case Study of Lanzhou, China

Zhao¹,

Zhang²,

Hu³

et al. 2022

Pol. J. Environ. Stud.

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The soil-water characteristic curve (SWCC) is an important hydrodynamic representation of soil and the basis for studying the water content of collapsible loess. The objectives of this study were to determine the water holding capacity of collapsible loess and the best fitting model of SWCC. We selected representative samples of collapsible loess in Lanzhou and measured the SWCCs. The SWCCs for soil samples varied with bulk density and particle size. The shapes were the same, but the volumetric water content (VWC) decreased as the suction increased. The suction of different soil layers tended to first decrease rapidly, then decrease more gradually and finally stabilize with VWC. The fitted VWC for the VG model was closer to the measured content, and the accuracy of the model was high. The VG-M (1-1/n, n) model was the best of the six models tested and was selected as the optimal model for fitting SWCCs, which will provide a theoretical basis for the accurate fitting of data of collapsible loess.

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An experimental study for evaluation of collapsible loess roadbed replacement method using lightweight soil

Hu,

Liu,

Ren

et al. 2023

Bull Eng Geol Environ

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Optimal mixing ratio and SWCC fitting of lightweight soil with cotton stalk fibres

Cited by 8 publications

References 18 publications

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

Laboratory Experiments and Numerical Simulation Study of Composite-Material-Modified Loess Improving High-Speed Railway Subgrade

Soil-Water Characteristic Curves and Fitting Models of Collapsible Loess: A Case Study of Lanzhou, China

An experimental study for evaluation of collapsible loess roadbed replacement method using lightweight soil

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