湖南大学学报（自然科学版）2012，Vol.39Issue(12)：19-24,6.
基桩动力稳定性模型试验研究
Model Test for Dynamic Stability of Piles
摘要
Abstract
In order to investigate the stability of piles under dynamic loads, an indoor model test was designed, in which homogeneous fine sand was used to simulate the subsoil around the pile shaft with various diameters, embedded ratios and boundary conditions at the top and the toe. Then, simple harmonic loads with different vibration amplitudes and frequencies were exerted at the pile top, and the corresponding dynamic responses of the pile shaft and subsoil (including dynamic stress and strain, etc) were measured with the sensors instrumented among the pile-soil system. Based on the test data obtained, a comparative analysis was made to discuss the dynamic influencing rules of various parameters (such as the diameter and embedded ratio of pile shaft, the frequency and magnitude of dynamic load, etc) on the pile top displacement. Furthermore, the parametric resonance phenomenon of the pile was observed and verified in the test. And the difference between the smaller frequencies measured and the theoretical values may be improved by a coefficient of k ranging from 0. 5 to 0. 8, which decreases with the increase of the dynamic load amplitude and the depth of subsoil.关键词
桩基础/高承台/动力稳定性/模型试验/参数共振Key words
pile foundation/high-rise pile cap/dynamic stability/model test/parametric resonance分类
建筑与水利引用本文复制引用
邹新军,陈少玉,尹帮顺,邓建安..基桩动力稳定性模型试验研究[J].湖南大学学报（自然科学版）,2012,39(12):19-24,6.基金项目
国家自然科学基金资助项目(50908084) （50908084）
教育部博士点基金资助项目(200805321042) （200805321042）
湖南省交通科技项目(200815) （200815）
湖南省青年教师成长计划项目(531107040620) （531107040620）
