摘要
采用风积沙作为堤坝填筑材料是一项新技术,它对沙漠区兴修水利工程具有重要意义。为研究风积沙碾压工艺性能并确定合理的施工工艺和参数,依托古浪县黄花滩调蓄水供水工程,通过对风积沙和粉土风积沙混合料进行颗粒分析试验、击实试验以及不同组合工况的现场碾压试验,开展了风积沙堤坝碾压工艺性能研究。试验结果表明:在现场施工条件下,干作业下最大干密度呈“双峰”特性的低含泥量天然风积沙呈不可碾压性,推荐采用湿作业;采用轻重振动组合碾压工况更加合理,天然风积沙湿作业时,单层摊铺厚度取400 mm,采用26 t压路机碾压5遍(静压1遍、轻振碾压1遍、重振碾压2遍、最后再静压1遍),压实度可以满足要求;掺入13%粉土后的风积沙混合料可碾压性更好,可有效提高坝面施工效率和工程质量;上层风积沙填筑碾压过程对下层风积沙的压实度有再次提升效果。
Using aeolian sand as embankment filling material is a new technology,which is of great significance to the construction of water conservancy projects in desert areas.In order to study the rolling process performance of aeolian sand and determine the reasonable construction technology and parameters,based on the Huanghuatan water storage and water supply project in Gulang County,the particle analysis test,compaction test and field rolling test under different combination conditions were carried out on the mixture of aeolian sand and silt aeolian sand.The test results showed that under the condition of on-site construction,the low mud content natural aeolian sand with the maximum dry density of bimodal characteristics under dry operation was not rollable,and wet operation was recommended.It was more reasonable to adopt the combined rolling condition of light and heavy vibration.When adopting wet construction,the single layer paving thickness was 400 mm,and the 26 t roller was used to roll for 5 times(static pressure 1 time,light vibration rolling 1 time,re-vibration rolling 2 times,and static pressure 1 time),the compaction degree could meet the requirements.The aeolian sand mixture mixed with 13%silt had better rolling performance,which could effectively improve the construction efficiency and engineering quality of the embankment.The filling and rolling process of the upper aeolian sand had a further improvement effect on the compaction degree of the lower rolled aeolian sand.
作者
甘涛
许健
张世茂
GAN Tao;XU Jian;ZHANG Shimao(College of Water Conservancy and Hydropower Engineering,Gansu Agricultural University,Lanzhou 730070,China;Gansu Water Conservancy Engineering Geological Construction Co.,Ltd.,Lanzhou 730000,China)
出处
《人民长江》
北大核心
2023年第7期140-146,共7页
Yangtze River
基金
甘肃省重点建设项目科研实验基金“风积沙筑坝技术及力学性能研究校企合作项目基金”(GD-XZ20200618)
甘肃农业大学水利水电工程学院科研团队建设专项资助(Gaucwky-06)。
关键词
风积沙
碾压工艺
碾压遍数
压实度
可碾压性
aeolian sand
rolling process
rolling times
compaction degree
rollability
