Influence of Coarse Grain Content on the Mechanical Properties of Red Sandstone Soil

Junhua Chen, Yanjiang Zhang, Yanxin Yang (), Bai Yang (), Bocheng Huang and Xinping Ji
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Junhua Chen: School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Yanjiang Zhang: School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Yanxin Yang: School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Bai Yang: School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Bocheng Huang: School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Xinping Ji: School of Architecture and Transportation Engineering, Guilin University of Electronic Technology, Guilin 541004, China

Sustainability, 2023, vol. 15, issue 4, 1-18

Abstract: Coarse-grained red sandstone soil is often used as embankment filling material but is prone to being broken by extrusion, which lowers the stability of the roadbed. This paper aimed to clarify the influence of the variation in coarse-grain content on the mechanical properties of coarse-grained red sandstone soil. Soil with a grain size greater than 5 mm is regarded as coarse-grained soil, and coarse-grained red sandstone soils with different contents of coarse grains were prepared as cylindrical specimens with a diameter of 300 mm and a height of 600 mm. Under three different confining pressures, a large-scale triaxial apparatus was used to carry out triaxial shear tests. The results showed that as the content of coarse grains of red sandstone (denoted as p ) increased, the deviation stress of static failure increased, showing a hyperbolic relationship. The internal friction angle also increased hyperbolically, while the cohesion reached a peak value and then decreased, and the maximum value of 133.8 kPa was reached at p = 30%. As the content of coarse grains increased, the maximum dilatancy increased. The maximum amount of shrinkage reached a peak value and then decreased, and the maximum value was reached when p = 30%. A coarse grain content p equal to 30% was the optimum value when coarse-grained red sandstone soil was used as a filling material.

Keywords: soil mechanics; triaxial shear test; deviation stress of static failure; cohesion; internal friction angle; elastic modulus (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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