土木学会全国大会年次学術講演会

This paper presents a case study of hydraulic uplift prevention below 14.5m deep excavation for basement construction in Central Jakarta. 600mm thick D-wall had been designed and constructed as temporary earth retaining structure by other parties. During the detail design stage, 3m to 4m thick diluvium sand layer was found below D-wall toe. This imposed the risk of hydraulic uplift failure during excavation. The water cut-off wall by jet grouting and chemical injection with pressure relief wells were proposed as preventive measure. The excavation reached the final excavation level safely with manageable rate of water ingress.