螺旋桩水平动力响应特性受几何结构影响的模型实验  

Model test on the dynamic response characteristics of screw piles due to the effects of geometrical structures

作　　者：张新春[1] 朱昂 何泽群 ZHANG Xinchun;ZHU Ang;HE Zequn(Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei,China)

机构地区：[1]华北电力大学机械工程系,河北保定071003

出　　处：《中国工程机械学报》2020年第4期293-298,共6页Chinese Journal of Construction Machinery

基　　金：国家自然科学基金资助项目(11402089);河北省自然科学基金资助项目(A2020502005);中央高校基本科研业务费专项资金资助项目(2020MS113)。

摘　　要：为了讨论桩体几何结构对螺旋桩水平动力响应特性的影响,通过自制的桩土动力相互作用模型实验平台,对砂土中不同材质、不同几何结构的螺旋桩模型的水平振动响应特性进行了研究。作为对比,给出了直桩模型的水平动力响应特性。具体分析了桩体几何参数(距宽比S/D、叶片外伸比D0/D)、载荷幅值(F0)、振动频率(f)对直桩和螺旋桩模型水平动力响应的影响。实验研究表明:直桩和螺旋桩模型的共振频率都随载荷幅值增大而减小;在同一水平激励荷载下,螺旋桩的共振频率和桩顶水平位移随叶片外伸比(D0/D)的增大而减小,但对叶片外伸比不敏感;螺旋桩的共振频率基本不随距宽比(S/D)的变化而改变;对比钢质与ABS材质螺旋桩可知,不同材质螺旋桩的水平动力响应趋势基本一致,但需要指出的是,ABS材质的螺旋桩桩顶水平位移更大,动力响应更加明显。In order to discuss the influence of geometrical structures on the horizontal dynamic response characteristics of screw piles,based on the self-made model test system of pile-soil dynamic interaction,the horizontal dynamic response characteristics of screw pile model with different materials and geometric structures in sand are experimentally investigated. For comparison,the dynamic response characteristic of straight pile model is also given in this paper. The influence of pile geometric parameters(blade spacing-width ratio S/D,blade extension ratio D0/D),load amplitude(F0)and vibration frequency(f)on the horizontal dynamic response characteristics of straight pile and screw pile is analyzed in detail. Experimental study shows that the resonant frequency of both straight pile and screw pile decreases with the increase of load amplitude. Under the same horizontal forces,the resonant frequency and the displacement of pile-top for screw pile also decrease with the increase of blade extension ratio(D0/D). However,they are not sensitive to D0/D. The resonant frequency of screw pile is not influenced by the blade spacing-width ratio(S/D). Through the comparison between steel and ABS material screw pile,the horizontal vibration response curve of screw pile with different material is identical. But it should be pointed out that the displacement of pile-top for ABS screw pile is larger than that for steel one,and the dynamic response is more obvious for ABS screw pile.

关 键 词：输电线路工程 螺旋桩 水平振动 共振频率 几何结构 

分 类 号：TU435[建筑科学—岩土工程]