摘要
假设桩周土符合Novak严格平面应变模型,在波的传播理论的基础上,通过引入势函数的方法,对土层水平振动问题进行了求解,得到了土层波动水平位移的衰减函数以及土层水平动刚度和动阻尼。在此基础上,利用初始参数法研究了桩-土-桩水平动力相互作用和群桩水平振动,并与Gazetas和Dobry近似平面应变模型进行了对比。研究表明:桩距和荷载作用角对两种模型得到的水平动力相互作用因子影响较大,桩间距对水平动力相互作用因子和群桩水平动力阻抗有较大影响。
The horizontal vibration of the soil is solved by potential functions based on the theory of wave propagation by supposing the soil around the pile satisfy the Novak plane strain model, and the rigorous expression of the attenuation function of the horizontal displacement of the soil caused by the vibration of the pile is obtained. The lateral dynamic stiffness and damping of the soil are also attained. The pile-to-pile dynamic interaction and the horizontal dynamic impedance of pile groups in soil were investigated by initial-parameter method, and were compared with those of the approximate plane strain model proposed by Gazetas and Dobry. The result indicated that the difference between the result of a rigorous plain-strain model and an approximate model is related to the pile space and the angle between the lines of two piles as well as the direction of the horizontal applied force, and that the pile space has great influence on the pile-to-pile dynamic interaction and the horizontal dynamic impedance of pile groups in soil.
出处
《工程力学》
EI
CSCD
北大核心
2010年第7期168-174,共7页
Engineering Mechanics
基金
国家自然科学基金项目(10872124/A020601)
上海市重点学科建设项目(Y0103)
上海市自然科学基金项目(06ZR14037)
关键词
平面应变模型
水平振动
动力相互作用
阻抗
初始参数法
plane strain model
lateral vibrations
dynamic interaction
impedance
initial-parameter method
