Open AccessParticle breakage characteristics of coarse-grained soil under point-point contact
Author(s) -
Zilin Li,
Cheng Zhao,
Y W Zhang,
Guo-bin Ouyang,
Shijie Yu,
Jian Zhou
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/570/3/032036
Subject(s) - breakage , lever , contact force , displacement (psychology) , geotechnical engineering , normal force , particle (ecology) , core (optical fiber) , materials science , mechanics , soil water , composite material , geology , engineering , soil science , physics , classical mechanics , mechanical engineering , psychology , oceanography , psychotherapist
As an excellent building material, the coarse-grained soil is widely used in various construction engineering. The breakage of coarse-grained soils has a great influence on the overall quality of the engineering. Therefore, it is very important to study the breaking characteristics of coarse-grained soils. In this study, limestone was used to simulate coarse-grained soil. Point-point contact experiments of different particle sizes and loading conditions were carried out to study the breakage characteristics of soil particles. The effect of particle size and loading conditions on breakage characteristics was investigated through analyzing the breakage processes, failure modes, force-displacement curves and cone core sizes. The results indicated that the spherical limestone particles break locally at the contact point with the increase of normal force in the normal loading experiments. And with the contact area expanding, the particles finally split into several fragments. The diameter and the depth of the cone core are proportional to the particle size. Whether particles broke completely depended on the loading lever of normal force under complex load conditions. The critical loading level of normal force of limestone with a diameter of 5cm was 70%. The horizontal angles of crack are proportional to the loading lever of the normal force. The diameter of the cone core is affected by both normal force and tangential force, and its depth is mainly affected by the magnitude of the normal force.