Study on Grouting Penetration in Soil Rock Mixture and the Mechanical Behavior after Grouting Reinforcement

Abstract Soil Rock Mixture (SRM) is often regarded as a problematic geological feature during geotechnical engineering projects, which is commonly reinforced by grouting methods. In this study, the mechanical behavior of grouted SRM is investigated. Laboratory experiments are carried out to study the fundamental penetration mechanism and distribution regularities of grout vein during grouting in SRM and investigate the influence of grouting reinforcement on the strength of SRM. The SRM material used in the experiment is prepared by mixing soil and gravel at different ratios. The grout veins are excavated after solidification to observe and categorize their typical distribution patterns and analyze the influence from rock blocks. Then, uniaxial compressive strength tests are conducted on the test samples of grouted SRM. Based on the experimental results, a theoretical model is proposed that considers the influence of block proportion, block count, grouting volume, and grout vein distribution. Finally, an evaluation method for the strength of grouted SRM which can reasonably estimate the strength of grouted SRM is proposed.