岩土工程学报Issue(2)：202-209,8.DOI:10.11779/CJGE201602002
开挖条件下黏土中单桩竖向承载特性模型试验与分析
Studies on pile bearing characteristics in saturated clay under excavation by model tests and a simplified method
摘要
Abstract
Based on a centrifuge pre-consolidation loading device, a model of pile vertical loading system can effectively control over consolidation ratio is developed out. The laboratory model tests of a single pile in saturated clay under excavation are carried out. Based on the results of model test, considering the change of undrained shear strength andK0 coefficient of soil caused by excavation, a simplified nonlinear approach for analysis of a single pile under excavation is proposed. Calculated results are compared with the test results of laboratory model tests of pile. Good agreement is achieved. In addition, responses of a single pile after excavation under vertical load are studied by the simplified method. Computational results show that after excavation, the ultimate bearing capacity of pile and pile head stiffness will reduce. A rational prediction method for estimating the loss of bearing capacity should consider not only the decease of the overburden pressure of the surrounding soil, but also the increase of theK0 coefficient and undrained shear strength.关键词
模型试验/开挖/极限承载力/抗剪强度/超固结比Key words
model test/excavation/ultimate bearing capacity/undrained shear strength/over-consolidation ratio分类
建筑与水利引用本文复制引用
纠永志,黄茂松..开挖条件下黏土中单桩竖向承载特性模型试验与分析[J].岩土工程学报,2016,(2):202-209,8.基金项目
国家重点基础研究发展计划（973计划）项目 （）
