长群桩基础承载力性状的大比例尺模型试验研究  

Large scale model tests on load transfer mechanism of long piled group foundation

作　　者：秋仁东[1] 刘金砺[1] 高文生[1] 邱明兵[1] 

机构地区：[1]中国建筑科学研究院地基基础研究所,北京100013

出　　处：《岩土工程学报》2012年第12期2233-2242,共10页Chinese Journal of Geotechnical Engineering

基　　金："十二五"国家科技支撑计划项目(2012BAJ07B01)

摘　　要：目前有关长桩基础承载性状的研究大都为工程静载试验的基桩,有关长群桩基础的承载性状的机制研究较少,亟需深入研究。通过大比例尺长群桩基础模型试验,对竖向荷载作用下的长群桩基础的承载力性状进行了深入研究,给出了基桩桩身轴力、侧阻力和承台底土压力的承载性状随群桩沉降发展的相关结果,深入分析了长群桩基础的承载力性状机理。该成果可为长群桩基础沉降性状的进一步研究提供依据。There are many research achievements for load transfer mechanism of long pile foundation. Most of them are based on single pile foundation at present. Therefore, the load transfer mechanism of the long pile group foundation needs further studies, including the shaft and tip resistance and the distribution of soil reaction under the raft of pile group foundation, A brief summary of the tests is provided. The measured axial force, shaft and tip resistance in each test are presented. The load-displacement transfer mechanisms of the resistance changing with the load and displacement are compared and discussed for the foundation piles at different positions. The results can provide the basis for tests and the practical reference for the settlement mechanism of long piled group foundation.

关 键 词：长桩 群桩 大比例尺模型 承载性状 

分 类 号：TU473[建筑科学—结构工程]