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刘山水库大坝裂缝及存在白蚁的险情,严重影响大坝工程安全,直接威胁着下游所保护的重要设施及百姓生命安全。采用药物充填灌浆,孔口封闭,全孔灌注法,对坝体裂缝及白蚁进行处理。在灌浆压力的作用下,浆液不仅沿着裂缝流动,而且会沿着裂缝两侧某些小主应力不足的地方渗透进去,且产生互相交错的细小裂缝,使浆液和坝体胶结紧密,从而达到处理坝坡裂缝的目的。另一方面,浆液中加入的毒杀白蚁专用药剂,不仅可以灭杀蚁道和巢腔内的白蚁,还可以毒化坝体土壤,防止白蚁孳生筑巢。在汛期来临之际,采用药物充填灌浆的方案,施工工期短,对大坝综合利用的干扰少;即能保证大坝安全度汛,对裂缝治理效果好同时能兼顾白蚁治理。但药物灌浆在灌浆施工过程中应采取相应的防范措施,设立醒目的警示标志,避免造成施工过程中人员中毒事件的发生,同时防止污染水源。目前,工程完工后已度过两个汛期,治理效果良好。
Liu Shan reservoir dam cracks and the presence of termite danger, seriously affecting dam safety, a direct threat to the protection of important downstream facilities and people’s lives and safety. Using drug filling grouting, orifice closed, full hole perfusion, cracks and termites on the dam treatment. Under the effect of grouting pressure, the sealant not only flows along the fracture, but also permeates along some small principal stress on both sides of the fracture, and produces small cracks interlaced with each other, cementing the slurry and the dam tightly, The purpose of dam slope cracks. On the other hand, the poisonous termites added to the slurry can not only kill the termites in the ant tunnel and the nest cavity, but also poison the dam soil and prevent the termites from breeding. In the flood season approaching, the use of drug filling grouting program, the construction period is short, less interference on the comprehensive utilization of the dam; that is, to ensure the dam flood safety, good effect on the crack control while taking into account termite control. However, during the process of grouting, the drug grouting should take appropriate precautionary measures and set up eye-catching warning signs to avoid the occurrence of poisoning incidents in the construction process and prevent the pollution of water sources. At present, after the completion of the project, it has spent two flood season and the treatment effect is good.