软弱土地区载体桩复合地基竖向承载特性试验研究  

Field test of vertical load-bearing characteristic of ram-compaction piles with composite bearing base composite foundation in soft soil areas

作　　者：李瑞[1] 冯志焱[1] 杨启安[2] 

机构地区：[1]西安建筑科技大学,西安710055 [2]北京波森特岩土工程有限公司,北京102218

出　　处：《建筑结构》2011年第2期101-105,77,共6页Building Structure

摘　　要：在软弱土地区对载体桩进行载荷试验,通过监测埋设的钢筋应力计研究分析加载过程中载体桩单桩的荷载传递规律及端阻的分担情况,通过监测钢筋应力计和土压计研究分析载体桩复合地基的荷载传递规律和桩土应力比。研究发现载体桩与普通混凝土灌注桩承载力发挥不同,并且目前大部分估算单桩承载力公式不适用于载体桩,采用Vesic在1972年提出的桩端极限荷载理论公式并且合理等效桩端面积进行估算的结果比较接近实测值。In soft soil areas,through static load test and testing the embedding reinforcement stress gauges in the ram-compacted pile with bearing base,the characteristic of load transferring and ratio of end bearing to total load were studied.The law of load transferring and pile-soil stress ratio of composite foundation were also analyzed by testing the embedding reinforcement stress gauges and soil pressure gauges.The results show that the bearing expressing of ram-compacted piles with bearing base is different from ordinary piles,and most of the formula to estimate limit load are not suitable for this type of piles,while the estimated limit load using the formula suggested by Vesic in 1972 and reasonable equivalent pile area is close to the testing bearing capacity.

关 键 词：载体桩复合地基 载荷试验 承载力 荷载传递 桩土应力比 

分 类 号：TU473[建筑科学—结构工程]