Field Test to Investigate Seismic Capacity of Pressure Grouted Anchors

本裁决是根据AD/ENG公告第85-25，“小说研究加速奖”。在世界上地震活跃的地区已经建造了许多回力墙(这些墙通过杆子或电缆捆绑或锚定在邻近的土壤上)。然而，对于这类围护结构的抗震分析和设计，目前还没有普遍接受的方法。本研究项目考虑了墙体采用压力注浆锚杆的情况。人们普遍认为，安装有注浆压力的锚杆比安装无注浆压力的锚杆具有更高的锚固能力。虽然运力较高的原因没有得到很好的解释，但对运力增加有几种可能的解释。根据实际原因，地震地面震动的影响可能会导致锚杆强度的损失。锚固能力的下降可能是微不足道的，也可能是导致墙体失效的严重能力丧失。这项研究项目将调查压力注浆锚杆承载力增加的原因，以及地震地面震动对这种承载力增加的影响。

This award is made according to the provisions in AD/ENG Bulletin No. 85-25, "Expedited Awards for Novel Research". Many tieback walls (the walls are tied or anchored by rods or cables to the adjacent soil) have been constructed in seismically active areas of the world. However there is no generally accepted method of seismic analysis and design for this type of retaining structure. This research project considers the case where the walls are tied with pressure-grouted anchors. It is generally recognized that anchors installed with grout pressure have significantly higher anchoring capacity than those installed without grout pressure. While the reason for the higher capacity is not well defined, there are several possible explanations for the increase. Depending upon the actual cause, the effect of earthquake ground shaking can lead to a loss in strength of the anchor. The decrease in anchor capacity may vary from insignificant to a critical loss of capacity leading to failure of the wall. This research project will investigate the cause of the increased capacity of pressure grouted anchors, as well as the effect of seismic ground shaking upon this increased capacity.