Analysis Of Earth Pressure Calculation And Deformation Effect Of Long And Short Combination Double-row Pile

The double-row pile support structure is a widely used foundation pit support system.However,unlike the conventionally defined arrangement rules such as length,equidistance,and symmetrical rules for row piles,irregular double-row pile supports such as non-equal lengths,non-equal distances,and non-joint beams at joints have begun to appear in the project.The structure,and because of its flexibility and economy after the transformation,has been well received.However,the published theoretical research and specific calculation results for such double-row pile structures are rare.Based on the theory of conventional double-row piles,this paper proposes the calculation model,structure form,design points,finite element simulation and engineering test application of long-short combined double-row piles,and compares and verifies the performance of various aspects.,analysis and judgment,and put forward a prospect for its future development.The completed work is roughly divided into the following stages:(1)Reviewing and summarizing the relevant research results of double-row piles or long-short combination double-row piles at home and abroad,summarizing the existing main calculation methods and theoretical derivations,and comprehensively summarizing the summary analysis and calculation paths,and comparatively analyzing them.The source of the theory,the pros and cons of the method,and the rationality of the application.(2)Based on the limit equilibrium theory and the Langken soil pressure method,the calculation model in the regulation is systematically analyzed and summarized.The soil resistance of the soil between the double-row piles is regarded as the spring force,and thefront and rear rows are calculated.The relevant formula of the pile body force provides a theoretical basis for the safety and stability of the supporting structure during production and operation,and analyzes the reliability and limitations of the method.On this basis,an improved double-row pile calculation model is proposed and modified.Corresponding formulas are proposed to derive the design control points.Through simplifying the modification,the calculation model and formula of the long-short combined double-row pile retaining structure are further proposed to solve the internal force and deformation of the long and short combined double-row pile retaining structure.(3)Using the finite element analysis software MIDAS-GTS,according to the engineering test,extract the relevant data of the long and short combined double-row pile retaining structure,and establish a three-dimensional finite element model,considering the length of the pile,the spacing,the pile spacing,the pile.The effects of body stiffness,soil parameters and attributes on the stability of long and short combined double-row pile support systems lead to conclusions that provide effective point control and design criteria for future applications.(4)According to the solid modeling of long and short combined double-row pile support and the whole foundation pit,the conventional double-row pile support structure model under the same conditions is established,and the two are subject to stress,engineering quantity,economy and deformation.For comparison,it is beneficial to analyze the long-short combined double-row pile support as a new type of system,and fit the engineering measured data with the simulation result data to verify the validity of the modeling and conclusion.