（1 中国建筑科学研究院， 北京 100013； 2 中国地质大学工程技术学院， 北京 100083）

 ［摘要］根据大型现场模型试验，对桩身内力、基底压力、土层位移和桩基沉降进行测定并分析。本次试验设计了4组模型，分别为载荷板试验、单桩试验、6d桩基础（d为桩的直径）试验和天然地基试验（承台大小同6d桩基础）。各组试验结果表明：6d桩基础的桩身压缩小于单桩；在一定沉降条件下，6d桩基础试验和天然地基试验（承台大小同6d桩基础）基底压力基本一致；6d桩基础在工作荷载情况下群桩效应不明显；6d桩基础的承载力特征值和沉降可根据天然地基静载试验及单桩静载试验进行预估；6d桩基础沉降稳定速率比天然地基快。

［关键词］桩基础； 桩身内力； 基底压力； 群桩效应； 沉降控制

中图分类号： TU473 文献标识码： A文章编号：  1002-848X(2016)S2-0505-05

Experimental study of  pile foundation based on settlement control

Zhang Song1, Liu Jinbo1, Guo Jinxue1, Lei Meng2, Liu Minyi1

(1 China Academy of Building Research Foundation Research Institute, Beijing 100013, China；

2 School of Engineering and Technology, China University of Geosciences, Beijing 100083, China)

Abstract: Based on the field model tests on internal force of pile body, the base pressure, soil displacement and settlement of pile foundation were measured and analyzed. In this experiment, four groups of tests were designed, including load plate test, single pile test, 6d pile foundation test (d is the pile diameter) and natural foundation test （the same size of 6d pile foundation）. The test results of each group show that the pile compression of 6d pile foundation was smaller than that of single pile; Under certain settlement conditions, the base pressure of pile foundation test is basically the same as that of natural foundation test (the same size of 6d pile foundation); The group effect of 6d pile foundation is not obvious under the condition of normal use load; The eigenvalue and settlement of bearing capacity of 6d pile foundation can be estimated according to the test of natural ground load plate and the static load test of single pile. The settlement stability of 6d pile foundation is faster than that of natural foundation.

Keywords: pile foundation； internal force of pile body； base pressure； pile group effect； settlement control

作者简介： 张松，硕士研究生，Email：1223600298@qq.com。