Inter-influences of synchronized excavation of closely constructed large-scale deep foundation pits

In order to study the inter-influences of synchronized excavation of closely constructed largescale deep foundation pits,a numerical simulation was introduced combining with a study case of Ruiming project in Shanghai.The internal force and displacement of the retaining wall,excavation support structure and adjacent area around the pits were analyzed for each real excavation step.Furthermore,the result of the numerical study was compared with that of detection test data onsite.It concludes that in order to decrease the inter-influences of synchronized excavation of closely constructed deep foundations pits,the suggested width of the safety isolation zone between pits should be about 2 times of the excavation depth.This research result may serve as a theoretical support and construction example for similar excavation engineering projects.