桩筏基础在竖向荷载作用下的时间效应

大量桩筏基础下存在较厚的饱和软弱下卧层 ,其变形和内力的研究不仅涉及到筏板、桩和土三者之间的相互作用 ,而且还跟时间有很大的关系。在建筑物施工和使用期间 ,地基变形逐步发展 ,基础的刚度不断变化 ,两者之间产生相互影响。地基的差异沉降还引起筏板及上部结构内力的变化。本文首次研究了存在软弱下卧层的桩筏体系的工作性状随时间变化规律 ,发现桩筏基础筏板内力、变形及桩顶反力受时间的影响较为显著

TIME EFFECTS ON PILED RAFT FOUNDATION UNDER VERTICAL LOADING

Research for the deformation and internal forces of piled raft foundation on a thick soft substratum are concerned with not only the interaction between pile, raft and soils but the also the time. During construction and utilization of buildings,the deformation of foundation soil and the stiffness of foundation are developing and changing with the time. The differential settlement of foundation soil causes in addition to the variations of internal forces in rafts and superstructures. For the first time,the paper makes a study of the regularity for time dependent worky behavior of piled raft system on a thick soft substratum,the results show that, the effects of the internal forces,deformation of raft and pile butt reaction on the time are comparatively remarkable.