| In recent years,with the advantages of prefabricated buildings such as short construction period,high engineering quality,less environmental pollution,and convenient maintenance,more and more prefabricated building are used in water conservancy construction.As one of the fast developing prefabricated buildings,prefabricated hydraulic retaining wall promotes the application of prefabricated technology in hydraulic engineering.This article is based on the Jiangsu Province Water Conservancy Science and Technology Project-Research on the Application of Assembled Design and Construction Technology for Small Hydraulic Structures(Project No.2019037).A systematic study is conducted on the design and optimization of prefabricated hydraulic retaining wall structures and the mechanical properties of joints,providing technical support for the application of prefabricated hydraulic retaining walls in water conservancy engineering.The research content and achievements of this article are as follows:(1)Preliminary Scheme Study on Prefabricated Hydraulic Retaining Wall StructureThis article combines the characteristics of hydraulic retaining walls and adopts a hydraulic cantilever assembly retaining wall structure.The horizontal vertical plate joint adopts a flat joint,and a water stop copper sheet is arranged at the joint and epoxy mortar is poured to fill the water stop;The horizontal bottom plate joint adopts a stepped joint and is inserted with bolts to connect adjacent unit retaining walls.The inlet and outlet of the joint are arranged with water expansion adhesive strips and filled with epoxy mortar to stop water.Select flat joints,concave convex joints,and tenon groove joints for longitudinal joints,and use GINA waterstops to fix them at the bottom plate joints.The vertical plate and bottom plate are connected by bolts and anchor bolts combined with angle steel.They are sandblasted and coated with special inorganic zinc anti rust and anti slip coating for rust prevention,which improves the friction coefficient of the contact surface of the connection nodes and improves the connection bearing capacity.Lifting holes are arranged at the vertical plate and bottom plate for mechanical lifting installation and the addition of anchor rods,which increases the safety of construction assembly.(2)Design of prefabricated hydraulic retaining wallThrough load calculation,stability check calculation,structural internal force calculation,structural design calculation,connection node calculation,prefabricated joint size design,material selection and size design of embedded parts,combined with engineering examples,a preliminary design scheme for hydraulic cantilever assembled retaining wall was achieved.It was verified that the preliminary design scheme met the requirements of specifications and standards,and the number and spacing of bolts and anchor bolt connection structures between the vertical plate and bottom plate of the retaining wall were determined.(3)Optimization of Structural Design for Prefabricated Hydraulic Retaining WallUsing genetic algorithms to economically optimize the amount of concrete used in prefabricated components during construction,the amount of steel reinforcement,the number of angle steel and bolts,and the amount of excavation and filling during construction and installation.The requirements of anti overturning stability,anti sliding stability,foundation bearing capacity,reinforcement ratio,and crack width were taken as safety constraints,and the self weight requirements of prefabricated components during transportation and lifting were taken as convenience constraints.Matalb’s built-in genetic algorithm toolbox was used to solve the problem,and the relevant indicators of the prototype retaining wall and the optimized retaining wall were compared.The total cost was reduced by 13.65%.(4)Simulation Test Study on Mechanical Properties of Prefabricated Hydraulic Retaining Wall JointsUsing ABAQUS finite element software,the maximum opening,rotation angle,bolt stress,angle steel stress,and contact surface stress of hydraulic cantilever assembled retaining wall flat joints,concave convex joints,and tenon groove joints under bending moment were studied through numerical simulation.The bending stiffness of different types of joints under high-strength bolt connection was compared,An empirical formula for the bending stiffness of hydraulic cantilever assembled retaining wall joints has been proposed.It is recommended to use a mortise and groove joint and conduct research on the size of the mortise and groove.Research has found that an appropriate size of mortise and groove joint can reduce the stress on the contact surface of the joint,the stress on bolts and angle steel,and reduce the maximum opening,but it does not affect the magnitude and trend of the bending stiffness of the mortise and groove joint. |
