Finite Element Analysis And Optimal Design Of Sluice Chamber Structure In Xianxing Irrigation Area

A sluice is a kind of low-hydraulic building.It blocks and discharges water by opening and closing the sluice gate.The design methods of sluice chamber structur e mainly include analytical method and finite element method.So far,the analytical method still occupies an important position in the calculation of most lock chamber structures.The analytical method is to calculate the gate floor and gate pier separately,using the gate floor as the foundation beam and the gate pier as the cantilever beam to calculate the internal force of the structure.This method cannot fully reflect the overall force situation of the structure.Reasonable analysis of the stress and displacement of the gate chamber structure is the key to ensuring the structural safety.Most of the northern regions of China are seasonal frozen soil regions,and there are different degrees of freezing-damage in hydraulic structures due to frost heaving or ice pressure.It is important to consider the ice pressure and the frost heaving force of the soil when designing buildings.In Heilongjiang province,fresh and new irrigation system renovation project of sluice gate as the research object,adopt analytical method of sluice chamber stability and foundation bearing capacity calculation,The ANSYS software was used to establish a three-dimensional model of the sluice structure and foundation,analysis of stress and displacement of sluice chamber structure with different load combinations under the five construction conditions including completion period,irrigation period,design flood level,check flood level,and frost heave conditions,and find more unfavorable conditions in operation of the projec t,to remake the lock chamber structure size,to improve the structure analysis,so as to get the best lock chamber structure.The main research contents of this article are as follows :(1)Using analytical method to check the stability of the sluice under four load combinations,namely,completion period,irrigation period,design flood level and flood level.The results show that under these four different working conditions,the maximum base stress of the lock chamber structure is smaller than the allowable bearing capacity of the foundation,and the safety factors of anti-sliding,anti-tilt and anti-floating stability do not exceed the allowable values of the code,which meet the design requirements.(2)Using ANSYS software to establish 3 D entity of sluice chamber structure and foundation model,in view of the engineering,including frozen condition occurred in the use of five different operating mode,load combination,non-linear finite element analysis was performed on the lock chamber,and finally the stress and displacement changes of the lock chamber structure were obtained.The results show that: the displacement change of the lock chamber structure is mainly caused by settlement,and the settlement amount of the five working conditions is generally small,the maximum vertical displacement is 12.069 mm,the minimum vertical displacement is 1.553 mm,the maximum tensile stress is 1.21 MPa,and the maximum compressive stress is 1.25 MPa,all meet the design requirements,which occurs in the working co ndition of frost heave and the checking flood level condition respectively.In the frost heaving condition,there is a phenomenon of stress concentration at the top of the bottom plate upstream of the side pier,so it is necessary to improve the reinforcement ratio and increase the overall stability of the lock structure.(3)According to the unfavorable working conditions in the project operation,the size and reinforcement of the lock chamber structure are optimized.Finite element analysis is performed on the optimized lock chamber structure.The analysis results show that the optimized lock chamber structure stress and displacement distribution are more reasonable,and the lock chamber structure size and reinforcement are more economical.