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内蒙古红山碾压均质土坝于1965年完建,坝高31m,座落在厚40～60m的覆盖层上,其上部24m为松散砂层,土坝的设计地震烈度7度,因而,对砂基的液化稳定多年来一直存在疑问。本文介绍了:工程概况;坝基细砂与坝体填土的室内动力试验结果以及对坝基砂层进行一维动力反应分析的情况;讨论了坝体不同部位,上游铺盖处的水头压力,盖重压力与振冲深度等因素对砂基抗液化能力的影响,在此基础上,依据红山土坝的已有条件、运用情况和加固施工条件,提出了对该已建土坝砂基的抗震加固方案,方案采用了两方面的加固措施,即在提高砂基抗液化能力的同时又强调限制可液化砂层的流动出液条件,所建议方案已被设计部门采纳,正在实施中。
Inner Mongolia Hongshan RCC homogeneous earth dam was completed in 1965. The dam is 31m high and is located on the overburden of 40 ~ 60m thick. The upper part of 24m is loose sand, and the earth dam has an earthquake intensity of 7 degrees. Therefore, Liquefaction of sand-based stability has been in doubt for many years. This paper introduces the project overview, the indoor dynamic test results of dam foundation sand and dam body filling, and the one-dimensional dynamic response analysis of the dam foundation sand layer. The paper discusses the water head pressure at different parts of the dam, Pressure and vibrating depth on the sand liquefaction resistance. On this basis, according to the existing conditions, application conditions and reinforcement construction conditions of the Hongshan earth dam, this paper puts forward some suggestions on the anti-liquefaction of sand foundation of the built earth dam Reinforcement program, the program uses two aspects of reinforcement measures, that is, to improve the ability of sand-based anti-liquefaction while also emphasizing the liquid liquefiable sand flow restrictions, the proposed program has been adopted by the design department, is being implemented.