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首页> 外文会议>Collaborative management of integrated watersheds >PREVENTING FAILURE OF A LARGE CANAL BY USING STAUNCHING TO ARREST LEAKAGE
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PREVENTING FAILURE OF A LARGE CANAL BY USING STAUNCHING TO ARREST LEAKAGE

机译：通过钉扎防止漏水来防止大运河的破坏

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The Tekapo Canal is a 26km (16 mile) long hydro power canal owned by Meridian Energy Ltd in New Zealand. Completed in 1976, the canal is 7m (23ft) deep and has a capacity of 120mVs (4,240 ft~3/s). The canal was constructed from compacted local glacial soils with a silty lining sourced from glacial till deposits.rnDuring 2007 and 2008 the canal showed signs of leakage where it crossed over a twin barrel concrete culvert. In October 2008 a diver inspection identified a series of sinkholes within the invert of the canal above the culvert. Approximately 6m~3 (211 ft~3) of silty gravel lining material had been eroded and testing showed direct and rapid connections between sinkholes and seepage outflows at the culvert outlet headwall. A programme of staunching of the sinkholes was immediately implemented whilst solutions were developed to arrest the leakage and enable the canal to remain operational.rnThe paper describes the procedures adopted for underwater staunching to fill voids and provide a low permeability blanket layer over the damaged section while the canal remained operational. In particular, after an initial period of void filling, the development and implementation of an innovative method of staunching with a low permeability silty gravel applied by a concrete pump over the floor of the affected area of canal is described.
机译：特卡波运河是新西兰Meridian Energy Ltd拥有的26公里（16英里）长的水力发电运河。运河于1976年完工，深7m（23英尺），容量为120mVs（4,240 ft〜3 / s）。运河是由压实的当地冰川土壤建造而成，其粉质衬里来自冰川直至沉积物。在2007年至2008年期间，运河跨越双筒混凝土涵洞时出现渗漏迹象。在2008年10月，潜水员检查在涵洞上方的运河内面发现了一系列的下水道。大约6m〜3（211 ft〜3）的粉质砾石衬里材料受到侵蚀，测试表明，涵洞出口端壁的下沉孔与渗流之间存在直接而快速的联系。在制定解决方案以阻止渗漏并使运河保持正常运行的同时，立即实施了排水坑的排水方案。本文描述了水下排水以填充空隙并在受损断面上方提供低渗透性覆盖层的程序，运河仍然运转。特别是，在初期的空隙填充之后，描述了一种创新的方法的开发和实施，该方法是用混凝土泵将低渗透性粉质砾石在运河的受灾区域的地面上施胶。

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