ABSTRACT
Ground anchor method has been usually used in solid ground. However due to topographic and economic reasons, it has been tried to install anchors in fracture zone, fill, loose sandy soil or cohesive soil which are not adequate as ground for fixing anchors.
The “Repeat-grouting type ground anchor” method is to reinforce low rigidity ground using a special grouting method. This anchor method with a special grouting device is characteristic of repeated pressure grouting at several intermittents of 0.33 ˜ 1.00 m intervals at the fixed part of the anchor.
In this study the effectiveness of this method were verified by the in-situ tests in several grounds with different mechanical properties and the laboratory model tests in the sandy ground with different soil densities. Moreover a designing method on the skin friction resistance of the anchors was proposed based on the test results.
