岩溶坝基帷幕灌浆高注浆量控制措施与效果分析

Measures and effect of high grouting volume control in curtain grouting for karst dam foundation

帷幕灌浆是坝基防渗处理的一种常用技术手段,而岩溶地区因其岩溶发育致使岩溶裂隙和通道纵横交错,且难以获取其规律性,灌浆过程中往往会出现注浆量偏高的现象。为了能够既有效控制帷幕灌浆成本,又确保帷幕灌浆施工质量,就需要采用科学、合理、可靠的施工技术措施和手段,对高注浆量的情况进行重点控制和改进。本文结合某水电站岩溶坝基帷幕灌浆中突出的高注浆量现象,通过有针对性地从技术措施和控制手段等方面的综合探索与应用,最终达到了坝基防渗的目的,并最大限度地节约了帷幕灌浆的时间,有效控制了高材料消耗所带来的高成本问题,为类似项目的帷幕灌浆积累了一定的经验。

Curtain grouting is a common technical method for dam foundation anti‑seepage treatment.Because of karst development in karst areas where karst fissures and channels crisscross,and it is difficult to find out their regularity,the grouting volume is often high.In order to effectively control the cost of curtain grouting and ensure the construction quality of curtain grouting,it is necessary to adopt proper and reliable construction technical measures and means to control and improve the situation of high grouting volume.In relation to the high volume consumed in curtain grouting for the karst dam foundation of a hydropower station,comprehensive exploration and application of specific technical measures and control means was conducted to achieve the purpose of dam foundation seepage prevention with the curtain grouting time reduced to the minimum and the cost of high material consumption effectively controlled,as well as some experience gained for curtain grouting for similar projects.