Numerical Analysis And Optimization Study Of Double-row Piles Supporting Structure

At present,my country’s social economy is in a state of rapid growth,and new requirements are put forward for the construction of large cities,especially high-rise buildings,subway tunnels and other projects.Underground space has become one of the most effective ways to relieve urban congestion,and deep and large foundation pits.Can greatly improve the effective utilization of underground space.How to reasonably support deep foundation pits has become an increasingly important research direction.The double-row pile supporting system is a rigid frame structure composed of two rows of parallel piles,and connecting beams connect the tops of the piles.This kind of support structure has small lateral displacement,large overall rigidity,and quick and convenient construction.It is currently widely used in foundation pit support and slope reinforcement projects.However,the function mechanism of the supporting structure and the characteristics of its influence on the soil and piles are not completely clear,and the design theory is not fully mature,which makes it more dependent on engineering experience.Based on previous studies,this paper proposes a double-row pile structure calculation model based on the elastic foundation beam method based on the multi-functional foundation pit project in Tongzhou District,Beijing.Combined with numerical simulation analysis,in-depth study of different row spacings and pile lengths,The depth of the foundation pit and other conditions on the structure’s force mechanism,surface settlement and pile deformation,compare the reliability and economy of different support structure design schemes;according to the characteristics of the double-row pile structure,grouting reinforcement is carried out to optimize the support It also reveals the effect of different grouting schemes on improving the stability of the structure;calculates the safety factors of different potential arc sliding surfaces in the soil layer of the foundation pit through numerical integration of the limit equilibrium method,verifies its rationality,and analyzes different structural parameters Impact on support stability.It provides a valuable reference for the design,optimization and application of doublerow pile support in foundation pit engineering.