Deformation Characteristics Control of Deep Foundation Pit Support Structure in Full Underground Space Hub
The Super-large Deep Foundation Pit Project of Xiongan Xiaoli Railway Station Transportation Hub,with a length of 1.05 km and a depth of 28 m,has the engineering characteristics of water-rich strata and complex geology,and belongs to a complex super-large deep foundation pit project with high safety risk level.In order to ensure the safety and stability of the foundation pit in the excavation stage,relying on the Super-large Deep Foundation Pit Project of Xiongan Xiaoli Railway Station Transportation Hub,3 different simulation schemes are designed around the double-row pile construction methods and reinforcement measures by using numerical simulation method,and the overall stress deformation characteristics of the foundation pit under different support and reinforcement schemes are discussed.The simulation results show that the support scheme of"double-row piles+local reinforcement of foundation base in front of piles"enhances the rigidity of double-row pile supporting structure,and controls the horizontal displacement of piles,reducing the horizontal displacement of pile top by 48％.The verification of measured data shows that the optimized double-row pile support scheme for foundation pit and the corresponding reinforcement measures can effectively reinforce and optimize similar deep foundation pits,thus ensuring the safe construction of foundation pit engineering.
underground transportation hubdeep foundation pitdouble-row pilesupporting structuredeformation controlnumerical simulation
NETL
NSTL
万方数据
