碎石桩复合地基桩土应力比的时效分析

来源期刊：中南大学学报(自然科学版)2008年第4期

论文作者：赵明华 马缤辉 张玲

文章页码：831 - 837

关键词：碎石桩；复合地基；桩土应力比；时效；

Key words：gravel-pile; composite foundation; pile-soil stress ratio; time effect

摘    要：

Abstract: Through studying the time effect characteristics of gravel-pile composite foundation, the stresses variation rules of both gravel-pile body and the surrounding soil along with the time were analyzed. Considering the bidirectional drained-consolidated characteristics of the surrounding soil where the water in the soil can be drained vertically and drained laterally, a calculation method considering time effect for stress of pile and that of surrounding soil was put forward according to the linear elastic theory analysis of the stress-strain relationship between pile and surrounding soil. A hyperbolic model of pile-soil stress ratio considering the time effect was established and a new calculation method for pile-soil stress ratio which took the time effect into account was obtained. The results show that the pile-soil stress ratio of gravel-pile composite foundation obeys the hyperbolic curve along with the time and the value of that is bigger than that of the time effect unconsidered, and the time effect of pile-soil stress ratio is so obvious that it can’t be neglected. Meanwhile, the hyperbolic model of pile-soil stress ratio can effectively adjust itself to the rules of the time effect of pile-soil stress ratio and the calculation result shows that the theoretical calculating curve that describes the relationship between the time and pile-soil stress ratio agrees well with the measured one obtained by the proposed method.

基金信息：国家“863”计划资助项目