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一、概 述 映秀湾水电站的拦河闸高20米,长100米,共分6孔(包括漂木道1孔,导流明渠1孔),建于复盖层厚度达45米的软基上,复盖层为不均质的砂卵石,自下而上共分7层,其中有透水性强的漂卵石层及易液化的粉砂层.为解决防渗问题,闸前75米范围作铺盖,并在闸前20米铺盖下作一道孔径1米的混凝土防渗墙,深度达24—27米.闸前73米长铺盖下作一道防渗帷幕灌浆.为解决冲刷问题,闸后60米范围作混凝土护坦,厚2—3米,为防止护坦以后的掏刷危及护担及闸基的安全,以及防止粉砂层液化.曾考虑过钢板桩方案和沉井方案,经比较后采用刚性较好的混凝土沉井方案.
I. Overview Yingxiuwan Hydropower Station Barrage 20 meters high, 100 meters long, is divided into 6 holes (including 1 hole drift Road, a diversion channel 1 hole), built in the cover thickness of 45 meters on the soft base , Covering layer of heterogeneous sand and gravel, bottom-up is divided into seven layers, of which there is a strong water-permeable pebble layer and liquefiable silt layer.In order to solve the problem of seepage, the gate before the 75-meter range And covered with a concrete impervious wall with a hole diameter of 1m under the cover of 20m in front of the gate with a depth of 24-27m and a seepage curtain grouting under the cover of 73m in front of the gate.In order to solve the erosion problem, Meters range for the concrete protection Tanzania, 2-3 meters thick, in order to prevent the protection of Tanzania after digging brush endanger the safety of the guard and gate, and to prevent liquefaction of silt layer. Have considered the steel sheet pile plan and sinking program, after comparison After the use of better rigid concrete caisson program.