Stress–dilatancy relationship for railway ballast

Abstract

In the concept of the aesthetic formation of knowledge and its as soon as possible and success-oriented application, insights and profits without the reference to the arguments developed around 1900. The main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique. Studies and InvestigationsThe main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique.Abstract: Knowledge of the mechanical behaviour of ballast is very important for designing a railway track, especially for high-speed lines. The monotonic drained triaxial tests of scaled and fouled ballast presented in literature were analysed using the Frictional State Theory. The stress-plastic dilatancy relationship shows that four characteristic stages of shearing may be specified. The influence of stress level and water content may be quantified by the use of the Frictional State Theory. Abstract:In the concept of the aesthetic formation of knowledge and its as soon as possible and success-oriented application, insights and profits without the reference to the arguments developed around 1900. The main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique. Studies and InvestigationsThe main investigation also includes the period between the entry into force and the presentation in its current version. Their function as part of the literary portrayal and narrative technique.

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].…”

Dilatant Nature of Sand Shear Strength

“…For failure states, a purely frictional behavior can be observed for sand shearing without the breakage effect [23][24][25][26]. The effect of breakage on the relationship between the strength and the dilatancy during the shearing of railway ballast, limestone gravel, and rockfill materials was observed by Szypcio [27] and Doł żyk-Szypcio [28,29].…”

“…α and β are new soil parameters that express the combined effect of the anisotropy, the grain breakage, the non-coaxiality of the stress, and the strain increment tensors, as well as other undefined effects. The values of these parameters for various stages of shearing should be determined experimentally [26][27][28][29]. For TXC and TXE at failure, α f = 0 and β f = 1, whereas for BXC, α f = 0 and β f = 1.4, for sands without breakage effects [22][23][24][25][26].…”

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

“…The segment of the -D P line between points Y* and F*, which represents shearing stage II is defined by equation 1with 2 and 2 parameters. If there is no breakage effect, 2=0 and 2=1 and this line is a part of FSL [24,[28][29], and Dq=D=0. If breakage exhibits only changes of volume caused by breakage Dq=0, then D>0 (2=0, 2>1) [31], but if breakage exhibits not only changes volumetric strain increment (D0) but also the energy of crushing grain contacts and grain breakage (Dq0), then 20 and 21 [30,32].…”