The Research of Stability for Reconstruction Project of Sluice in Baihe Dazhantou

Currently, there are more and more sluice construction projects, and the demands of project qualities continue to improve.In sluice design researches, stability study may be very difficult.Combining with the practical project, this paper analyzes the stability of sluice chamber and retaining wall in detail and summarizes the calculation process, which can be the reference to other similar projects in the research of stability. Project OverviewBaihe Dazhantou sluice project is located at Bai River near Dazhantou village, which is 8km far from Xindian Township, Wancheng District, Nan yang.Flow rate from the sluice is more than 5000m 3 /s.The level of project is largeⅠ.The level of main building is 1, the secondary is 2 and temporary is 4.This project is the headwork of Baitong canal in Yahekou irrigated area.The new sluice is in the original headwork movable dam location basically.It is divided into upstream connection section, control section, stilling pool section, apron extension section, anti-scour trench segment, the right bank diversion dyke protection section and the left bank downstream protection section.Sluice chamber consists of 24 holes, it is open type structure.Two holes make up one unit; it has a total units of 12.The single span width is 12 meters, total width is 332 meters.Surface elevation of sluice board is 133 meters and top level is 140.20 meters.Designed water level in front of sluice is 136.8 meters.When hundred-year flood is coming, water level in front of sluice is 138.4 meters; level of tail water is 138.19 meters.Water level in front of sluice is 139.16 meters, tail water level is 138.81 meters under the condition of two hundred-year check flood.Hoist room is set on the sluice pier.On both sides of the sluice chamber set bridgehead, Hoist room is set on the sluice pier.On both sides of sluice chamber set bridgehead.The access bridge is under hoist room.The vertical seepage project is set up in front of sluice board.This sluice project adopts energy dissipation by underflow method.The fold beam steel gate is used as bulkhead gate and the flat steel gate is used as working gate, starting and stopping with lifting hoist.In order to increase seepage paths, sluice chamber along with key-wall has a high-pressure sprinkle wall with average depth of 19 meters; the bottom of the stilling pool behind sluice is laying macadam, which has a thickness of 0.15 meters.Drain system is paved at the bottom of stilling pool, it's distribution likes plum blossom.There are 1-meter depth alveolus lay in front of sluice and behind the sluice toe. The Research of Sluice Chamber StabilitySluice chamber stability study mainly includes calculating the stability of sliding resistance, the maximum base stress and the no-uniformity coefficient of stress on basement.Sluice chamber stability calculations take sections between two adjacent permanent seams as a cell.The structure of chamber is monolithic, seams are in piers.The calculating processes consider one-sided stability