STUDY ON THE STANDARD SAND AND WHITE CARDBOARD'S FRICTION PERFORMANCE USED IN GEOTECHNICAL DESIGN COMPETITIONS

This paper mainly introduces natures of the Brazil White cardboard(abbr:White cardboard) and the Standard sand, including their physical and mechanical parameters. A model named the friction of Standard sand-White cardboard was made in regard to the friction performance of the White cardboard and the Standard sand. In the model, the stripped White cardboard simulated the reinforced body, and the Standard sand simulated the rock-soil body. We attempted to find out how the Standard sand's compactness and White cardboard's size or shape and other influence factors might change the friction of Standard sand-White cardboard. In the experiment, we adopted the Variable-controlling approach by Changing in turn the influence factors. Then we recorded values of the friction of Standard sand-White cardboard on different conditions, and drew corresponding line charts. Finally we got the conclusion:the friction of Standard sand-White cardboard grows with the Standard sand's compactness to a certain extent. It grows with the White cardboard's width and the White cardboard's length embedded in the Standard sand. It grows with the numbers of diamonds in the White cardboard, it but does not grows clearly when the number exceeds two. It decreases with the space between diamonds to a certain extent. It decreases with the crosswise diagonal line's width of the diamond, but in the middle it is independent of the width.