DEVELOPMENT OF A NEW COMPACTION GROUTING METHOD WITH IMPROVED UPHEAVAL CONTROL AND LIQUEFACTION COUNTERMEASURES

Abstract

 The Compaction grouting (CPG) method is one of the liquefaction countermeasures to increase the density of improved ground by injecting mortar statically into the ground. CPG is often adopted just below or near the existing structures, and accordingly ground upheaval often becomes a problem. In this study, a series of model experiments of CPG methods were conducted for the purpose of developing a method which has more efficiency than the conventional construction's upheaval control. Consequently, the proposed method has proven itself in reducing the ground upheaval quantity by more than 80 %. Furthermore, the results demonstrate that the ground density, K-value and effect of liquefaction countermeasures can be significantly increased by the proposed new Up and Down method (U/D method).