Key Technologies for Design and Construction of Ultra-deep Diaphragm Wall in Complex Strata
Based on a rectangular ultra-deep foundation excavation project with a depth of 45.5m in a soft soil area in Shanghai,the key technologies of the design and construction of an ultra-deep diaphragm wall with a depth of about 90m are systematically studied.A series of design parameters,such as wall framing design,water stop measures,concrete mix ratio,steel bar configuration and verticality requirements suitable for ultra-deep foundation excavation engineering,are proposed.Before the formal construction,the grooving test of complex strata and the first construction acceptance were carried out to determine the construction capacity,construction efficiency and construction parameters,and systematic construction control measures were put forward for the common construction quality problems that are prone to occurrence in the ultra-deep underground continuous wall.On this basis,the formal construction of the ultra-deep underground continuous wall of the project was completed.The ultrasonic detection and excavation verification results of the wall quality meet the design requirements.The groundwater monitoring data outside the pit have verified the control effect of the confined water of the suspended curtain and have successfully passed the service process of foundation excavation and structural reconstruction.
deep foundation excavationsoft soildiaphragm walltrench with millingwaterproof curtainconfined aquiferdesignconstruction
万方数据
维普
