含水率对土石坝砂砾料填筑标准控制和压实特性的影响

Influence of water content on filling standard and construction quality control of sand gravel material for dam construction

为评估相关土工试验规范在风干状态确定土石坝砂砾料填筑标准的合理性,研究含水率对土石坝砂砾料填筑标准控制和压实特性的影响,本文基于现场密度桶法原级配砂砾料大型相对密度试验,结合现场碾压试验,并在总结相关研究成果基础上,研究了含水率对土石坝砂砾料填筑标准控制和压实特性的影响,论证了在风干状态确定土石坝砂砾料填筑标准的合理性和相关规范推荐的砂砾料碾压加水量的合理性,提出了确定砂砾料筑坝加水与否的原则,即结合上坝砂砾料的天然含水状态、砂砾料的颗粒级配、砂砾石坝坝型和填筑标准等几个方面综合考虑,并通过现场碾压试验来确定是否加水以及加水量。研究成果可为土石坝砂砾料填筑标准控制和碾压施工加水量确定提供指导和参考。

In order to evaluate the rationality of determining the filling standard of sand gravel materials for earth-rock dams under the condition of air drying in relevant geotechnical test specifications,the influ⁃ence of water content on the filling standard control and compaction characteristics of sand gravel materials for earth-rock dams is studied.Based on the large-scale relative density test of sand gravel material pre⁃pared by field density barrel method,combined with field rolling test,and on the basis of summarizing rel⁃evant research results,this paper studies the influence of water content on the filling standard and construc⁃tion quality control of sand gravel material for dam construction,and demonstrates the rationality of using air dried sand gravel material to determine the dam filling standard and the rationality of the amount of sand gravel material rolling water recommended by relevant specifications.The principle of determining whether to add water in sand gravel dam construction is put forward,that is,considering the natural water content state of sand gravel material,grain gradation of sand gravel material,dam type of sand gravel dam and filling standard,and through field rolling test to determine whether to add water and how much water is added.The research results can provide guidance and reference for the standard control of sand gravel filling and the determination of water addition for rolling construction.