Stress-dilatancy behavior of sand incorporating particle breakage

Fangwei Yu (Author)

Abstract

This paper presents the stress-dilatancy behavior of sand incorporating particle breakage. A series of the drained triaxial tests were conducted on the Silica sand No.5 and the pre-crushed sands that were produced by several drained triaxial tests on Silica sand No.5 under 3MPa confining pressure in simulating the high-pressure shear process to result in particle breakage, to investigate the stress-dilatancy behavior of sand incorporating particle breakage. For a given initial void ratio, particle breakage was found to result in deterioration of the stress-dilatancy behavior in the impairment of the dilatancy of sand to become more contractive with a reduction in the maximum dilatancy angle and the excess friction angle (the difference between the peak-state friction angle and the critical-state friction angle). By introducing the concept of the skeleton void ratio in considering particle breakage, a linear stress-dilatancy relationship between the maximum dilatancy angle-over-the excess friction angle and peak-state skeleton void ratio was proposed in semi-logarithmic plane and popularized to the mobilized stress-stain state as a stress-dilatancy equation pertaining to particle breakage, which would be useful in assessing the evolution of the stress-dilatancy behavior of sand during particle breakage.

Keywords

dilatancy angle;friction angle;particle breakage;sand;triaxial tests;

Data

Language:	English
Year of publishing:	2017
Typology:	1.01 - Original Scientific Article
Organization:	UM FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
UDC:	624.13
COBISS:	302984704
ISSN:	1854-0171
Parent publication:	Acta geotechnica Slovenica
Views:	1118
Downloads:	90
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary title:	Napetostno odvisno razmikanje peska upoštevajoč drobljenje zrn
Secondary abstract:	V članku je predstavljeno napetostno odvisno razmikanje peska z upoštevanjem drobljenja zrn. Za ta namen je bil izveden niz dreniranih triosnih preizkusov na kremenovem pesku številka 5 in predhodno zdrobljenih peskih, ki so bili pridobljeni z več dreniranimi triosnimi preizkusi na kremenovem pesku številka 5 pri 3 MPa bočnega tlaka, s čimer je ponazorjeno striženje peska pri visokih tlakih, to pa ima za posledico drobljenje delcev. Za podani začetni količnik por je bilo ugotovljeno, da ima drobljenje delcev za posledico zmanjšanje napetostno odvisnega razmikanja peska, kar se kaže bodisi kot kontrakcijsko obnašanje ali kot zmanjšanje maksimalne vrednosti kota razmikanja in s tem zmanjšanje dodatnega strižnega kota (razlika med vrhunsko vrednostjo strižnega kota ter strižnim kotom pri kritičnem stanju). Z uvedbo koncepta količnika por skeleta pri obravnavanju drobljenja zrn je predlagan linearen odnos za napetostno odvisno razmikanje v obliki zveze med maksimalnim kotom razmikanja, dodatnim strižnim kotom in vrhnjo vrednostjo količnika por skeleta v pol-logarimični ravnini. Ta zveza je nato razširjena na mobilizirano napetostno-deformacijsko stanje. Dobljena enačba napetostno odvisnega razmikanja, ki vključuje drobljenje zrn, je uporabna za oceno vpliva drobljenja zrn na napetostno odvisno razmikanje peska.
Secondary keywords:	geotehnika;pesek;drobljenje delcev;razmikanje peska;strižni kot;
URN:	URN:SI:UM:
Type (COBISS):	Scientific work
Pages:	str. 54-61
Volume:	ǂVol. ǂ14
Issue:	ǂ[no.] ǂ1
Chronology:	2017
ID:	10941824