新型伞状抗拔锚现场试验与数值模拟  

In-situ test and numerical simulation of the umbrella-shaped uplift anchor

作　　者：徐敏[1] 宋林辉[1] 周峰[1] 梅国雄[1] 宰金珉[1] 

机构地区：[1]南京工业大学土木工程学院,南京210009

出　　处：《岩土力学》2009年第S1期24-28,共5页Rock and Soil Mechanics

基　　金：江苏省六大人才高峰项目(No.06-F-014);国家自然科学基金(No.50608038);江苏省自然科学基金(No.BK2007582)

摘　　要：伞状抗拔锚是一种新型的锚杆装置。通过现场试验获得了其抗拔承载性能,从正常使用条件下Q-S曲线可见,与同场地施工的抗拔桩比较,新型伞状抗拔锚的承载力显著提高。鉴于试验条件的不足,未能获得伞状抗拔锚的极限承载力。为获得伞状锚达到极限状态时的Q-S曲线,采用ABAQUS有限元软件,对伞状抗拔锚和抗拔桩的原位抗拔试验进行数值模拟。模拟主要分2步来实现,先通过调节参数得到与试验一致的正常使用条件下的Q-S曲线,然后增加荷载,得到极限状态下的伞状抗拔锚的Q-S曲线。结果显示,伞状抗拔锚能够充分调动其扩大端的土体参与抗拔,得到的Q-S曲线表明伞状锚的抗拔性能存在很大潜力,具有显著的优越性。The umbrella-shaped uplift anchor is an innovative anchor device.Based on the in-situ test,the uplift resistance behavior of the umbrella-shaped uplift anchor has been carried out.Compared with uplift piles at the same site,the capacity of the umbrella-shaped uplift anchors can be obviously improved,while the Q-S curve is under the normal state condition.Because the test conditions are not adequate enough to obtain the ultimate bearing capacity of the umbrella-shaped uplift anchor,the in-situ test of the umbrella-shaped uplift anchor and uplift piles have been numerically simulated with the ABAQUS finite element software,so that the Q-S curve of the umbrella-shaped uplift anchor at the limit state can be obtained.The simulation is divided into two stages.The first stage is adjusting the parameters to make it consistent with the test Q-S curve under the normal state condition.And the second stage is increasing the load to get the Q-S curve of the umbrella-shaped uplift anchor at the limit state.The result shows that the umbrella-shaped uplift anchor can fully mobilize its expanding soil participating in uplift.The Q-S curve further indicates that the uplift resistance behavior of the umbrella-shaped anchor has great potentiality and prominent superiority.

关 键 词：伞状抗拔锚 承载性能 抗拔桩 数值模拟 

分 类 号：TU473.1[建筑科学—结构工程]