Study On Mechanical Characteristics And Fast Assembly Process Of 3D Printed Concrete Assembled Sluice Wall Assembly Members

The rapid development in the last decade has seen great development from printing methods as well as raw material selection,especially the integration of 3D printing technology with the concrete construction industry,which has brought great changes to the traditional construction methods.Research on the secondary use of abandoned mines has also been developing rapidly in recent years.Waterproof gate walls,as important concrete structures for waterproofing or storing water in underground spaces,are widely used to prevent and manage water damage in underground mines.The use of concrete 3D printing technology,combined with the assembly construction process,provides a solution for the rapid construction of waterproof gate walls.In this paper,a combination of site investigation,theoretical analysis,physical tests and numerical simulations was used to investigate the mechanical properties and rapid assembly process of 3D printed concrete assembled waterproof gate wall components,specifically the following work was carried out.(1)Uniaxial compression,triaxial compression and Brazilian splitting tests of 3D printed concrete test blocks were designed and conducted.Through the analysis of the test data,it is concluded that the printing path and stacking mode have significant influence on the tensile,shear and compression strength of the specimen under compression,shear and splitting tensile loads.The printing interlayer interface is the "weak interface" of the 3D printed concrete specimen interlayer interface.(2)Abaqus software was used to simulate and analyze the splitting test and uniaxial compression test of 3D printed concrete specimens under four different printing paths and different stacking modes.The results show that the simulation results of the splitting test are in good agreement with the experimental results,which proves the effectiveness of the cohesive element model to simulate the interlayer bonding effect.The simulation results of uniaxial compression test show that the compressive strength of 3D printed concrete using parallel superposition method is higher than that of vertical bond layer,which is in good agreement with the test results.The validity of software simulation of mechanical properties of 3d printed concrete specimens is further verified.(3)Use Abaqus software,simulation analysis of the mechanical properties of the3 D printed concrete assembly waterproof gate wall body section assembly module under the action of uniform load;simulation analysis of the 3D printed concrete assembly waterproof gate wall body section assembly module after the equilibrium of the ground stress of the combined components,the impact of 5MPa water pressure at the waterward end on the stability of the main section of the combined components,and the establishment of the main section of the cast-in-place components comparison.Analysis shows that under the influence of 5MPa water pressure,the main section of the composite members and the main section of the cast-in-place members of the stability of no major difference,and are not more than the ultimate concrete breaking strength,the maximum deformation of only 0.35 mm.(4)Based on the findings of the previous chapter,we propose a rapid assembly process of the assembled waterproof gate wall based on 3D hit concrete technology for pumped storage power plants and underground spaces of coal mines.Compared with the traditional cast-in-place waterproof gate wall construction process,this rapid assembly process can realize multiple sub-projects at the same time,with the advantages of fast,flexible and cost-saving.The process has certain engineering significance and reference value.