An experimental study on stress-strain behavior and constitutive model of hardfill material

Abstract

Hardfill is a new type of artificially cemented material for dam construction works, with a wide application prospect. Its mechanical behavior lies between concrete and rockfill materials. A series of large-scale triaxial tests are performed on hardfill specimens at different ages, and the stress-strain behavior of hardfill is further discussed. The strength and stress-strain relationship of hardfill materials show both frictional mechanism and cohesive mechanism. An age-related constitutive model of hardfill is developed, which is a parallel model consisting of two components, rockfill component and cementation component. Moreover, a comparison is made between the simulated and the experimental results, which shows that the parallel model can reflect the mechanical characteristics of both rockfill-like nonlinearity and concrete-like age relativity. In addition, a simplified method for the determination of parameters is proposed.hardfill, stress-strain relationship, large-scale triaxial tests, constitutive model PACS: 81.05.Zx

Experimental Study on the Shear Strength of Cement‐Sand‐Gravel Material

“…is is consistent with the observations of Fu et al [7] and other researchers [5] who have reported that increasing the cementing agent content is highly e ective in enhancing the shear strength of CSG and various other Advances in Materials Science and Engineering materials, such as cemented sand and polyurethane foam adhesive rock ll materials.…”

“…Crushed stone: particle sizes less than 5 mm (3%), 5-10 mm (20%), 10-20 mm (35%), and 20-40 mm (42%), sourced from a Nanjing suburb [5]. Sand: particle size of approximately 0-4.75 mm, mediumcoarse sand crushed from limestone.…”

“…e ratio of sand to crushed stone is 1 : 4, which was the same as that used in the experimental study by Sun et al [5]. In this paper, the aggregate gradation for Material I is termed No.…”

“…e Mohr-Coulomb theory, which serves as the basis for the strength criterion for CSG material in this study, is commonly used to describe the stress-strain response of materials [5][6][7][8]. It can be expressed as follows:…”

“…Although extensive, the effects of the confining pressure on the shear strength of CSG material were not considered in these previous studies. Wu et al [5] analyzed the effects of curing age on the shear strength of CSG material via triaxial testing and subsequently used the test data to establish a shear strength criterion as a function of the curing age and confining pressure. Sun et al [6] conducted triaxial tests on CSG materials with cementing agent content of less than 60 kg/m on the shear strength of CSG material under different confining pressures.…”