Landslide-reinforcement method and its application based on jet grouting to improve sliding-soil strength

Abstract

Owing to its versatility in civil-engineering applications such as slope stabilisation, foundation consolidation, and tunnel construction, jet grouting has been lauded for its swift implementation, cost effectiveness, and high structural integrity. This study introduces an innovative framework and procedural technique for landslide reinforcement using jet grouting. Using the transfer-coefficient method, we develop an integrated strength model that encompasses the altered mechanical attributes of soil layers following jet-grouting treatment at the slide interface. This model underpins a bespoke stability calculation formula for landslides reinforced by jet grouting. The Sanhepu landslide is used as a case study, where the methodology unfolds across the testing, reinforcement-scheme design, project-execution, and monitoring phases. Our study shows that jet grouting substantially enhances the shear strength of sliding soil, with the treated soil exhibiting greater strength than its interface with a rock. A strategic reinforcement plan that considers the positioning, spacing, and height of jet-grouting columns is shown to significantly improve landslide stability. The stability coefficient for the Sanhepu site increases significantly from 1.184 before intervention to 1.453 after intervention. The theoretical findings are applied in practice to the Sanhepu landslide, with emphasis on targeted sliding-soil reinforcement. Post-intervention monitoring substantiates the stabilisation and confirms the effectiveness of the jet-grouting method for soils susceptible to sliding.