Improvement of Alluvial Soils Using Cement Injection Method

Injection soil improvement is one of the methods of modifying the properties of the site of construction projects or existing structures. Several stabilization techniques are available to improve such conditions, including compaction, consolidation, mechanical stabilization, and cement injection into the soil. The injection is often done by filling cavities and fractures with grout or cement mortar. Despite almost the same principles, injection methods have different equipment and procedures. These methods have their characteristics and advantages due to insufficient bearing capacity, shrinkage swelling, settling, and durability. This study intended to review the studies and methods of improving alluvial soils using the cement injection method. After reviewing the results of this study, we can get three main factors: percentage of cement, setting time (sample age), and percentage of coarse soils have a very effective and controlling role in the strength of soil-cement samples, but the effect of these three factors is not the same in increasing strength. The results of such experiments can be used as a basis for quality control of cement injections in porous media, especially in coarse-grained alluvial sediments and jointed and crushed rocks. The resistance of coarse-grained alluvial sediments with the potential for spillage can be increased, during or after tunnel excavation, by adding a minimum percentage of injected cement to the desired strength or design strength, which is essential from the technical and economic justification of injection projects.