Ground Anchor Structure

Ground Anchor Structure:

In Japan, ground anchors have been widely applied for stabilization of slopes and landslides， and the technology has advanced since its introduction in Japan in the 1950s. Success in prevention of landslides during earthquakes has shown that ground anchors have demonstrated  effectiveness in resisting seismic forces. However, ground anchors may degrade when they are not maintained, and the stability of slopes that are reinforced by these anchors during earthquakes may be questionable. This report shows the importance of maintenance for assurance of seismic resistance. It also reports experimental results on the seismic resistance of ground anchors. The seismic resistance of nut-fixed anchors is certified by the technical examination and certification process of Sabo Technical Center (STC pp 3- -6, 2009) and others. As a result, nut-fixed ground anchors have been applied in earthquake-resistant slope measure projects, and they have been used in many recovery efforts for quays in fishing ports damaged by the 2011 off the pacific coast of Tohoku Earthquake and other earthquakes. This report presents case studies of some of these applications.