堆载预压法处理道路软基的效果分析

本文通过广州市一条堆载预压 7年的道路工程资料研究 ,发现软基区填方路堤在 2 .5～ 3.0m间存在一临界高度。路堤低于临界高度时 ,路基沉降量随路堤增高增加缓慢 ;路堤高于临界高度时 ,路基沉降量随路堤增高迅速增加 ;但路堤高度一定时 ,软基沉降量随软土层厚度变大增加缓慢。堆载 7年后 ,在原埋深 3.0m以上的软土的物理力学性质改善 2 7%～ 6 9% ,3.0m以下软土的物理力学性质改善 1%～ 5%。

Analyses of Effect of Treating Soft Soil Foundation of Road by Heaped Load Precompaction Method

According to the study on the road engineering data of 7-year heaped load precompaction in Guangzhou City the paper finds that in the embankment of soft soil foundation area there is a critical height betwe en 2.5m and 3.0m. When the embankment is less than the critical height, the emba nkment settlement capacity, the settlement capacity of the subgrade is slower in increment along with the heightening of the embankment. When the embankment is higher than the critical height, the settlement capacity of the subgrade increas es rapidly along with the heightening of the embankment. But when the embankment has a certain height, the settlement capacity of the soft soil foundation is sl ower in increment along with the enlargement of the thickness of soft soil strat a. After 7 years of the heaped load the physical and mechanics feature of soft s oil with above 3.0m deep can improve 27%～69% and that with under 3.0m deep can improve 1%～5%.