A THEORETICAL MODEL OF SHEAR STRENGTH FOR FIBER-REINFORCED SANDY SOIL BASED THE MICRO INTERFACE SLIP EFFECT

FENG Deluan; XIAO Xueli; LIANG Shihua

doi:10.13204/j.gyjzg20122215

Volume 51 Issue 10

Feb. 2022

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FENG Deluan, XIAO Xueli, LIANG Shihua. A THEORETICAL MODEL OF SHEAR STRENGTH FOR FIBER-REINFORCED SANDY SOIL BASED THE MICRO INTERFACE SLIP EFFECT[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(10): 147-156,140. doi: 10.13204/j.gyjzg20122215

Citation:

FENG Deluan, XIAO Xueli, LIANG Shihua. A THEORETICAL MODEL OF SHEAR STRENGTH FOR FIBER-REINFORCED SANDY SOIL BASED THE MICRO INTERFACE SLIP EFFECT[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(10): 147-156,140. doi: 10.13204/j.gyjzg20122215

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A THEORETICAL MODEL OF SHEAR STRENGTH FOR FIBER-REINFORCED SANDY SOIL BASED THE MICRO INTERFACE SLIP EFFECT

doi: 10.13204/j.gyjzg20122215

School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China

Received Date: 2020-12-22
Available Online: 2022-02-21

Abstract

Abstract

Fiber-reinforced sandy soil is a multi-phase and multi-scale geo-material, and its strength is determined by properties of the heterogeneous materials of soil and their coupling interaction mechanical responses. On the basis of the microscopic slip effect between sand grains and between sand grains and fibers,a soil cell-element that could describe the internal material information and fiber characteristics of fiber-reinforced sandy soil was constructed by dividing fiber-reinforced sandy soil into different phases of materials to study the influence of the geometrical and mechanical characteristics of fibers on the shear strength of fiber-reinforced sandy soil. According to the compatible geometry deformation between fibers and soil on the microscale,the notion of strain gradient that could effectively describe the interface discontinuity of mechanical response was introduced,and a theoretical model of fiber-reinforced sandy soil based on mesophysical mechanisms was proposed. Moreover,the results from consolidated-undrained triaxial tests conducted by Michalowski and Cermak were used to validate the proposed model. Meanwhile,the theoretical parameters of the model were quantitatively studied. The results showed the addition of fibers caused plastic rotation gradient and interface slip of sand particles adjacent to fibers which was the mesoscopic physical mechanism for the fiber-strengthened effect of fiber-reinforced soil.
- soil mechanics,
- fiber-reinforced soil,
- interfacial slip,
- mesoscopic physical mechanism,
- shear strength criterion

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References

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