Static And Dynamic Analysis Of A Sluice Chamber Structure In The Project Of Water Diversion From The Yangtze River To The Huaihe River

The Project of Water Diversion from the Yangtze River to the Huaihe River is a major water resource allocation project to replenish water across the basin from the lower reaches of the Yangtze River to the middle reaches of the Huaihe River.The Henan section project is a part of the river water transmission section to the north,which function is to supply water for urban life and industry,repaire water ecology and improv water environment.The sluice studied in this paper can raise the water level of the Qingshui River to make it reverse flow during the normal operation period,and prevent floods and discharge water logging during the flood season.Therefore,the safe and stable operation of the sluice is an important guarantee for the water safety of the Yangtze River to Huaihe River Water Diversion Project to the north.According to the safety appraisal,the sluice is a Class 4 sluice and needs to be demolished and rebuilt.On the basis of the preliminary design of the sluice,this paper aims at the reconstruction plan of the sluice’s original 5-hole sluice being converted into a 3-hole sluice,using ANSYS finite element calculation software to calculate the sluice chamber section during the completion period,normal water level,50-year the static characteristics under the conditions of the design water level and the check flood level are analyzed,and the seismic response of the gate is calculated at the same time.The main work and conclusions are as follows:(1)In this paper,the engineering background and preliminary design results of a sluice in the Yangtze-Huaihe River Diversion Project are introduced,and hydraulic calculation,anti-seepage drainage design,structural design calculation for the sluice are conducted.The stability under five working conditions of flood level,maintenance and check flood level was analyzed and checked.(2)The overall calculation model of the lock chamber structure was established by using ANSYS software,and the static characteristics of the sluice chamber structure under four conditions of completion period,normal water level,50-year design water level and check flood level were calculated and analyzed.The results show that: The displacement of the sluice is dominated by the vertical settlement,the maximum settlement of the bottom plate is 52.37 mm,and the maximum settlement of the pier part is 52.45 mm,all of which occur in the downstream part and occur in the check flood level condition.The maximum tensile stress of the bottom plate and the gate pier is 1.55 MPa and 0.75 MPa respectively,which both occur in the check flood level condition.(3)The modal analysis of the sluice chamber structure under the normal water level condition is carried out,and the first five orders are selected as the key mode shapes.As the order increases,the natural vibration frequency of the lock chamber increases,and the dynamic response is dominated by low-order vibration modes and supplemented by high-order vibration modes.Each mode shape conforms to the general natural vibration law and has good natural vibration characteristics.The influence of hydrodynamic pressure on the structure decreases with the increase of the mode shape number.(4)The dynamic response of the sluice was obtained by using ANSYS software to perform dynamic analysis on the normal water level of the sluice subjected to the seismic loads in the downstream and transverse directions respectively.The results show that the dynamic displacement of the sluice is dominated by vertical settlement,and the maximum settlement of the bottom part appears on the upstream side of the intersection of the right-side pier and the bottom plate,which are 52.23 mm and 51.42 mm respectively.Appeared on the upstream side of the right-side pier,respectively 54.82 mm and 53.71 mm.Under the two kinds of seismic loads,the tensile stress of the bottom plate is located at the intersection of the lower surface of the bottom plate and the gate pier,with the maximum values of1.60 MPa and 1.62 MPa respectively.The maximum tensile stress of the pier is located at the gate slot of the pier,with the maximum values of 1.85 MPa and 1.88 MPa respectively.Therefore,in the process of optimization design,necessary measures should be taken to control the uniform settlement of the foundation as much as possible,and increase the reinforcement ratio at the intersection of the gate groove and the bottom gate pier,so as to avoid the structural failure.