龙开口水电站坝基深槽处理设计

Design of Deep Trench Treatment in Dam Foundation of Longkaikou Hydropower Station

龙开口水电站施工过程中,发现原主河床存在较大规模的深槽。该深槽形态复杂,顺河向斜穿整个坝基,处理难度极大。采用跨深槽布置钢筋混凝土承载板与槽挖回填混凝土全置换方案,深槽处理与坝体混凝土同步施工,尽可能减少对泄洪坝段直线工期的影响,较常规处理方案提前发电时间约9个月。

During the excavation of dam foundation in Longkaikou Hydropower Station, a wide deep trench is found in original main riverbed. The deep trench has complex geometry and cuts through entire dam foundation along the river＇s direction. Its treatment is extremely difficult. The treatment plan of constructing reinforced concrete bearing plate covering tile deep trench and backfilling trench with concrete after trench excavation is suggested. The plan can guarantee the simultaneous construction of deep trench treatment and dam concrete pouring, and minimize the influence on the straight line duration of spillway construction. This plan makes the power generation of first hydro-generator nine-months earlier than other conventional treatment schemes.