Effects of geographical parameters of cement - soil piles on the stability of embankment foundation on soft soil

Abstract

In calculate the ground improvement for design road ground on soft soil, the geometric parameters of
cement-soil piles such as pile length L, pile diameter d, distance between piles D have a great influence
on the stability (settlement S, stabilization coefficient Fs) of the embankment foundation and the
effectiveness of improvements. When L is larger, S decreases and Fs increase, when L is small, S is
mainly the subsidence of soil under reinforced soil. When D / d = 1.5 - 2 residual settlement (S) after
treatment has not changed significantly; D / d = 2 - 3, then S increases but S <Scp ; D / d = 4 then
S > Scp. Keeped L, D (L = 14m, D = 1.8m) and change d = 0.6; 0.7; 0.8; 1.0 m then S ≤Scp. The
arrangement distance between piles and pile diameter is chosen so that the ratio D / d 1.5 -3; The
length of pile (L) is depends on the thickness of the soft soil layer so that the residual settlement after
treatment S ≤ Scp(Scp =0,2-0,3m).
Keywords: cement-soil piles; settlement; stability; soft soil; the geometric parameters of piles.