In response to the problem of the influence of construction wide joints on the internal force of the integral lock chamber bottom plate,the bending moment calculation analysis and research of the bottom plate are carried out under different wide joint positions,different filling heights before sealing,and different foundation conditions.Using the finite element method,taking maintenance conditions as an example,the situation with wide joints is compared with no wide joint.The results show that when the distance between the wide joint and the side wall L is 3-17 m,the negative bending moment at the mid span decreases by 26%-39%.When the filling height before sealing is 3-9 m,the negative bending moment at the mid span decreases by 18% to 40%.For soil or composite foundations,when the elastic modulus is taken as 20-100 MPa,the negative bending moment at the mid span decreases by 29%-33%.For pile foundations,when the elastic modulus of the soil is set to 20-40 MPa,the negative bending moment at the mid span decreases by 41% to 45%.For rock foundations,the negative bending moment at the mid span remains unchanged.Under soil foundation,composite foundation,or pile foundation conditions,the wide joints should be symmetrically arranged at L ranging from 0.1-0.2 times the width of the lock chamber,where the bending moment and stress are minimized.Under rock foundation conditions,construction joints can be used instead of construction wide joints.