The influence of particle breakage on stress-dilatancy relationship for granular soils

Abstract

The influence of particle breakage on soil behaviour is important from theoretical and practical perspectives. Particle breakage changes the internal energy in two ways. First, internal energy is consumed for particle crushing and second, the internal energy changes because of additional volumetric strain caused by particle crushing. These two effects may be quantified by use of Frictional State Theory. The analysed drained triaxial compression tests of Toyoura sand, gravel and Dog's Bay sand at different stress level and stress path revealed that the effect of particle breakage is a function of soil gradation, strength of soil grains, stress level and stress path.

Stress–Dilatancy Relationship of Erksak Sand under Drained Triaxial Compression

“…For sands, the critical frictional state angle and the critical state angle are equal (φ • = φ cυ ) [9,10,12]. The influence of grain crushing on the stress ratio-plastic dilatancy relationship for soils with weak grains is shown in previous studies [13,14] and for railway ballast in a previous report [15]. The linear stress ratio-plastic dilatancy relationships for various shear phases of Toyoura sand under undrained triaxial compression conditions were also obtained [16].…”

“…If the sample is deformed homogeneously, the − relationship represents the frictional state (α3 = 0, β3 = 1.0) and under large deformations εa > 25%, the critical frictional state reaches ( = ). For various sands, stress levels, and stress paths, the − relationship also varies [13,16]. With the use of the frictional state concept, the relationships of stress ratio-plastic dilatancy for various stages of shearing were calculated.…”

A stress dilatancy relationship for coarse-grained soils incorporating particle breakage

“…The accurate grasp of engineering properties of CGS is of significance to dam safety. It is well recognized that particle breakage can occur even at low stress levels [5][6][7][8], which greatly influenced the engineering behaviors of CGS [9][10][11][12][13][14], especially stress dilatancy behavior [15,16]. The stress dilatancy relationship is significant for soil modelling.…”