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DESIGN AND CONSTRUCTION OF THE LENIHAN DAM OUTLET TUNNEL AND SHAFT

机译:勒尼汉水坝出口隧道及竖井的设计与施工

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A damaged outlet pipe beneath Lenihan Dam has restricted reservoir discharges, severely constraining the owner's groundwater recharge program. The solution, a new outlet pipeline through the dam's right abutment, includes an approximatelyi 2.2-m-deep (40-ft-deep) shaft and 618.7-m-long, 4.3-m-diameter (2,030-ft long, 14-ft-diameter) tunnel mined in Franciscan melange composed of hard blocks of rock and soft clayey matrix. Alternating roadheader with drill and blast operations and using steel ribs and shotcrete have proven a flexible combination for handling the variable ground conditions. Excavating the shaft and connecting it to the tunnel require lowering the reservoir for five months, during which time careful construction sequencing and use of a tunnel plug eliminate the risk of an uncontrolled discharge.
机译:Lenihan大坝下方的出水管损坏,限制了水库的排水,严重限制了业主的地下水补给计划。该解决方案是一条通过大坝右基台的新出口管道,包括大约i 2.2米深(40英尺深)的竖井和618.7米长,4.3米直径(2030英尺长,14英尺)。直径的隧道在方济会混杂岩中开采,该岩石由坚硬的岩石块和软质的黏土基质组成。实践证明,交替使用掘进和爆破掘进机,并使用钢肋骨和喷射混凝土,可以灵活应对各种地面条件。挖掘竖井并将其连接到隧道需要将水库降低五个月,在此期间,仔细的施工顺序和使用隧道堵头可消除无控制排放的风险。

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