High-speed railway's roadbed consolidation with fracture grouting in collapsible loess area: mechanism and application

摘要

This paper discussed the reasons and the harms of high-speed railway's roadbed settlement in collapsible loess area. On the basis of the experimental simulation and mechanical analysis, the mechanism of fracture grouting is concluded, and a set of upper grouting test equipment is developed as well. Through a set of tests under different grouting pressures, and analyses on the soil's mechanical properties and displacement variations, a quadratic approximation formula is gained. Meanwhile, the mechanism for fracture grouting and the validity of laboratory simulation is tested and verified. In addition, the effect of fracture grouting on high-speed railway's roadbed consolidation in collapsible loess area is also got by fieldqs trial. The results of the current paper provide guide and reference for studying fracture grouting in collapsible loess area.