摘要
作为沉管砂桩与预排水动力固结法联合加固软土地基的关键技术之一,本文对吹填软土地基上砂桩工艺以及轻型井点降水效果进行分析。现场测试表明,在降水过程中,地下水位呈不断下降趋势,最后当抽水时间达到150h后趋于稳定。此外,由孔隙水压力计测定的孔隙水压力下降值小于地下水位下降引起的静水压力值,这与土层的滞水性和土层的透水性有关。
As a necessary technique of improving hydraulic fill foundation by using sand piles and dynamic compaction method,this paper analyses the pre-dewatering effect by the well-point dewatering method.Filed tests show that the water level drops continuously with time in the process of dewatering,and finally tends to steady values in about 150 hours.Besides,the dropping magnitudes of pore water pressure measured by pore pressure transducers is generally lower than the hydrostatic pressure caused by dropping of water level,which are induced by the back water and the permeability of soil layers.
出处
《建筑科学》
北大核心
2011年第7期42-45,55,共5页
Building Science
关键词
井点降水试验
吹填软土
水位
孔隙水压力
well-point dewatering method
hydraulic fill
water level
pore water pressure
