Experimental study on stick-slip behaviour and sintering phenomenon of glass beads
CUI Deshan1，XIANG Wei1，2，CHEN Qiong1，WANG Shun3
(1. Faculty of Engineering，China University of Geosciences，Wuhan，Hubei 430074，China；2. Three Gorges Research
Center for Geo-hazard，Ministry of Education，China University of Geosciences，Wuhan，Hubei 430074，China；
3. Institute of Geotechnical Engineering，Universität für Bodenkultur，1180 Vienna，Austria)
Abstract：In order to investigate the stick-slip phenomenon and surface sintering of saturated granular materials，spherical soda lime glass beads were used to perform consolidated drained triaxial compression，single particle compression，oedometer and thermal melting tests. The triaxial compression experiment results showed that the stick-slip events of saturated and dense glass beads always appeared under higher confining stress. As increasing the confining stress，the mean amplitude drop of the deviatoric stress shows an exponential growth. At the slip phase，the abrupt drop of the deviatoric stress corresponds to the jump of volumetric strain. At the stick phase，the deviatoric stress increases gradually，showing strain strengthening characteristic. The sample volume contracts first and then dilates until the next slip phase. The consistency of the deviatoric stress and cell pressure is better than the pore water pressure because the cell pressure was more accurately measured. The single compression test，the oedometer test and the thermal melting test results show that in the ambient temperature condition，the sintering form of particles is totally different from the thermal melting in the high temperature condition. In the ambient temperature condition，due to the action of contacting and compressing，the surface of particles gradually dissolve and then re-precipitate on surrounding surface of glass beads，but with lower sintering strength and small morphologic change of glass beads.
2016, Vol. 35 
