Numerical study of effectiveness of horizontal grouting in liquefaction mitigation for existing building foundation

Abstract

As a method of ground reinforcement to prevent liquefaction, various construction methods have been applied. A method to stabilize the ground using a fixative or stabilizer is the most useful method for the reinforcement of construction against liquefaction for lower levels of existing structures. However, the vertical or inclined grouting that is generally applied to construction sites has drawbacks in efficiency and reinforcement range as well as drilling problems at the bottom of existing structures. To overcome these drawbacks, some equipment and reinforcement methods that can conduct grouting after digging underneath of existing structures in the horizontal direction have been developed. As a foundational study to develop the above technology, this study conducted a dynamic finite differential analysis (FLAC 2D) to compare and review the effects of liquefaction reinforcement methods using the grouting method. As the analysis results, the horizontal grouting method is considered more effective to reduce liquefaction occurrence than applying the slope and vertical reinforcement conditions.