| 杨玉生,赵剑明,王龙,刘小生.级配特征对筑坝砂砾料填筑标准的影响[J].水利学报,2019,50(11):1374-1383 |
| 级配特征对筑坝砂砾料填筑标准的影响 |
| Influence of gradation characteristics on filling standard of sand gravel material for dam construction |
| 投稿时间：2019-08-04 |
| DOI：10.13243/j.cnki.slxb.20190547 |
| 中文关键词: 级配特征 筑坝砂砾料 填筑标准 |
| 英文关键词: gradation characteristics gravel materials for dam construction filling standard |
| 基金项目:国家重点研发计划课题（2016YFC0401601，2017YFC0404905）；国家自然科学基金项目（51679264）；中国水科院基本科研业务费项目（GE0145B562017） |
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| 中文摘要: |
| 筑坝砂砾料填筑标准具有级配相关性，在砂砾料筑坝施工质量控制中，目前仅以含砾量来表征级配对碾压干密度的影响，未考虑级配形状和最大粒径不同对砂砾料填筑标准的影响。为了研究这种影响，评估目前单一依靠含砾量来表征级配特征对干密度影响的合理性，设计了含砾量相同而级配曲线形状和最大粒径不同的两组级配曲线，结合实际施工振动碾压条件，通过现场密度桶法，研究了含砾量相同时不同级配形状特征和最大粒径对原级配筑坝砂砾料填筑标准的影响。研究表明，控制含砾量相同时，级配曲线形状对砂砾料最大、最大小干密度有一定影响，随级配参数m和b的增大，砂砾料的最大、最小干密度均呈现减小的趋势。在含砾量和级配参数m相同时，不同最大粒径级配的砂砾料的最大、最小干密度也有差异。表明不同级配特征和最大粒径对筑坝砂砾料填筑标准的确定有一定影响，建议结合具体工程进一步对级配特征和最大粒径对筑坝填筑标准影响的敏感性及对施工质量控制带来的影响进行评估。 |
| 英文摘要: |
| The filling standard of gravel material has gradation correlation. In the quality control of gravel dam construction,the influence of gradation on dry density of roller compaction is only expressed by gravel content at present, and the influence of gradation shape and maximum particle size on the filling standard of gravel material is not considered. In order to study this effect and evaluate the rationality of using gravel content alone to represent the effect of gradation characteristics on dry density, two groups of gradation curves with the same gravel content but different gradation curve shape and maximum particle size were designed. Combining with the actual construction conditions of vibration rolling, the same gravel content was studied by the density barrel method in situ. The influence of different gradation shape characteristics and maximum particle size on the filling standard of original graded sand gravel for dam construction. The results show that the maximum and minimum dry densities of gravel are affected by the shape of gradation curve and the maximum particle size when the gravel content is the same. The maximum and minimum dry densities of gravel decrease with the increase of gradation parameters m and b. When the gravel content and gradation parameter m are the same, the maximum and minimum dry densities of gravel with different maximum particle size gradations are also different. It shows that different gradation characteristics and maximum particle size have certain influence on the determination of filling standards of dam sand and gravel. It is suggested that the sensitivity of gradation characteristics and maximum particle size to filling standards of dam construction and the impact on construction quality control should be further evaluated in combination with specific projects. |
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