Abstract:At present, with the rapid development of economy, geotechnical engineering construction at the edge of the mountain and river become more and more. And different thickness sand pebble bed is common. The majority of the sand pebble bed is loose, poor cementation and strong instability. Therefore the process of the subway foundation pit excavation may lead to larger ground deformation, adverse impact, accident and casualties. So reinforcing sandy pebble stratum by grouting is frequently used to impr...