拖曳锚嵌入机理及运动特性实验研究  

Experimental research for embedment mechanism and kinematic characteristic of drag anchors

作　　者：张炜[1] 刘海笑[1] 

机构地区：[1]天津大学建筑工程学院,天津300072

出　　处：《东南大学学报（自然科学版）》2010年第3期581-586,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA09Z348);国家自然科学基金重点资助项目(50639030);新世纪优秀人才支持计划资助项目(NCET-06-0241)

摘　　要：针对拖曳锚的嵌入机理和运动特性,设计并实施拖曳锚模型实验.模型实验系统主要由模型水槽、拖曳系统、测量系统和模型锚板4部分组成.实验采用接触式测量技术,实时测量了拖曳力、拖曳角、拖曳距离及锚板方位角、翻转角和运动位移等多运动参数.通过系统分析锚板的运动参数和嵌入轨迹,结果表明:设计锚胫角增大,对应锚板的方位角、嵌入深度和拖曳力均成倍增加;锚板形态对锚板的拖曳嵌入性能具有重要影响,优化的梯形锚板较矩形锚板的各方面性能均有所提高.由实验验证得出,矩形锚板在土中的行进方向平行于锚板平面;在嵌入过程中,锚板的方位角与拖曳角之和近似为常数.A model experiment is designed and developed to investigate the embedment mechanism and kinematic characteristic of drag anchors.The model experiment system is mainly composed of four parts： experimental flume,drag system,measurement system and model anchor.The contact measurement technique is adopted. Kinematic parameters of the anchor,including the drag force,drag angle,drag distance,pitch and roll of the anchor,and displacement of the anchor are measured simultaneously during dragging.By systematically analyzing kinematic parameters and trajectories of the anchor,it is concluded that a larger design shank-fluke angle leads to a larger orientation of the anchor,a larger drag force and an obvious deeper penetration depth;the shape of the anchor plays an important role in the performance of the anchor,and the trapezoid anchor shows better performance than the rectangular anchor.Experiment results show that the rectangular anchor moves parallel to its fluke surfaces in soils;the sum of the drag angle and the orientation of the anchor can be approximately regarded as a constant during embedment.

关 键 词：拖曳锚 法向承力锚 模型实验 嵌入机理 运动特性 

分 类 号：TV223[水利工程—水工结构工程]