Study on Deformation Characteristics of Deep and Shallow Gradual Distance Double Subway Foundation Pits
In order to study the deformation characteristics of the excavation of adjacent subway foundation pits,based on the foundation pit project of Beijing Metro Line 3,the study uses Rocscience phase2 finite element software to simulate the excavation and support process of the foundation pit,compares simulation results with on-site monitoring dates and explores the effects of different foundation pit distance on horizontal displacements of the ground wall,the surface settlements outside and between the pits and the uplift of the pit bottom.The results show that the horizontal displacement of the ground connecting wall is approximately"convex belly type"and"bow type".With the increase of the pit spacing,the horizontal displacement of the lateral ground connecting wall decreases gradually,and the horizontal displacement of the inner ground connecting wall increases gradually.The overall surface settlement is"groove type",and the surface settlement value between pits decreases with the increase of pit spacing.Affected by the superposition effect of adjacent pit excavation,the maximum surface settlement value between pits is about 1.2～1.5 times that of both sides.The uplift of pit bottom is a"cap shape"with large center and small sides,and is less affected by the change of pit spacing.
adjacent foundation pitspit spacingdeformation characteristicsnumerical simulation
NETL
NSTL
万方数据
维普
