Abstract: Relying on the project of “Dawukou Regulating Reservoir for Water Supply in the West Line of Yinchuan Metropolitan Area”, this paper makes a thorough study on gravel-soil admixture in dam filling of plain-type reservoir, and discusses its applicability in dam filling by means of its physical and mechanical characteristics. Through the particle test of different mixing ratio, the optimum mixing ratio of clayey soil to sand and gravel (volume ratio) is determined to be 7∶3, and the admixtures are compacted in the laboratory and rolled in the field. After reaching the designed compactness of 98%, the permeability test, direct shear test and compression test are carried out, and all the test results meet the design and specification requirements. Moreover, the shear strength index of the admixture is far greater than that of the clay soil, which is more conducive to the anti-sliding stability of the dam body. The research and application of gravel-soil admixture technology improves the construction quality, solves the problem of material source, saves the project investment, and ensures the safety of the project. The study shows that gravel-soil admixture has a good application prospect in the dam filling of plain reservoir, which can provide technical reference for similar projects.

Key words: gravel-soil, dam filling, rolling construction, detection

摘要： 该文依托“银川都市圈西线供水水源大武口调蓄水库”工程项目,对平原型水库坝体填筑中砾石土掺合料进行了深入研究,分析掺合料的物理力学特性,探讨其在坝体填筑中的适用性。通过对不同掺合比例的颗粒分析试验,确定最佳掺合比例(黏性土与砂砾石体积比)为7∶3,并对掺合料做室内击实试验及现场碾压试验。达到设计压实度98%后再进行渗透试验、直剪试验及压缩试验,其试验结果均满足设计及规范要求。且掺合料的抗剪强度指标远远大于黏性土,更加有利于坝体的抗滑稳定性。研究表明,砾石土掺合料在平原型水库坝体填筑中具有良好的应用前景,提高施工质量、解决料源问题、节约工程投资、更加保证工程的安全,可为类似工程提供技术参考。

关键词: 砾石土, 坝体填筑, 碾压施工, 检测