INFLUENCE OF GRAIN-SIZE CONSTITUENT ON FROST HEAVE IN FINE SAND
Wang Zhengqiu ( Constructional Engineering College Harbin )
From statistical analysis on laboratory results of frost heave in fine sand(equ.l and 2 ) , it is found that the change of frost heave rate K in water saturated fine sand is between 0.35-8.69%, in which the decisive factor is the content of clay grain ( 0.005mm) (see Fig. 1). when its content is less than 1 % of the total weight, there is no or only a very little migration of water in the fine sand and K3.5%. The value K increases with the rise in the content of silt grain (0.05-0.005mm), but its influence is far below than of clay grain (see Fig. 2). The higher the content of grain greater than 0.05mm, the smaller the possibility of frost heave.