Deformation Analysis and Optimization Design of Underground Composite Support
"Underground composite support"is a composite load-bearing body formed by connecting the engineering piles at the bottom of the foundation pit with the foundation pit support pile wall by arranging reinforced cement soil at the bottom of the foundation pit.During excavation of the foundation pit,the composite load-bearing body is jointly subjected to force to resist deformation,effectively controlling the deformation of the retaining structure and suppressing the uplift of the soil at the bottom of the pit.This article proposes the concept of"underground composite support"and its design theory,analyzes the influence of key design parameters such as replacement rate of pit bottom reinforcement area,dosage of curing agent,and reinforcement depth on the deformation of foundation pits,and provides design basis and theoretical reference for the application of"underground composite support"in engineering practice.Based on engineering examples,an optimized design scheme for underground composite support was proposed for the original support system,and the feasibility of the new composite support was verified,which has demonstrated its advantages in controlling the horizontal displacement and uplift deformation of the foundation pit enclosure structure.Meanwhile,according to the optimized design scheme,the number of supports in the foundation pit can be reduced,which is safe and economical.
deep foundation pitpit bottom reinforcementexcavation supportnumerical simulationoptimal design
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