Investigation into the isotropic compression of wet granular soils using discrete element method

Abstract

Abstract. In this paper, the authors aim to present a 3D model using the Discrete Element Method (DEM) to study the quasistatic response of very loose assemblies of frictional spherical grains to an isotropic compression in the presence of a small amount of an interstitial liquid, which gives rise to capillary menisci and attractive forces. A reduced pressure P* is defined, comparing the confining pressure to the tensile strength of contacts. The effects of initial assembling process and various micromechanical parameters on the plastic compression curves are first studied. The influences of rolling resistance at contacts and the size polydispersity along those compression curves are also mentioned.

Dynamic compaction of cohesive granular materials: scaling behavior and bonding structures

“…8. 50,51 The trend in this intermediate-to-loose crossover observed in Fig. 8 is similar to that of the dense-to-intermediate crossover, but there is an obvious asymmetry between them.…”

“…8. 50,51 Fig. 9 Void ratio e as a function of time for 3 different values of the ratio m w /m of wall mass to particle mass, 2 different values of cohesive stress s c , and 2 different values of pressure p. The trend in this intermediate-to-loose crossover observed in Fig.…”

“…A similar compaction process was simulated in 3D and similar results were obtained. 50,51 There are few simulations accounting for particle shape change. A new algorithm coupling material point method (MPM) for the simulation of particle deformation with DEM for frictional contact interactions in 2D was able to simulate the compaction of a collection of soft disks down to a porosity close to zero.…”