摘要
为探究无砂混凝土在高地下水位渠道边坡衬砌中的适用性,以南水北调工程某页岩渠坡段衬砌施工为例,对不同配合比下的无砂混凝土进行了有效孔隙率、强度和不同水头下的渗透试验。结果表明:粗粒径含量越多,有效孔隙率越大,连续级配的有效孔隙率低于单粒径级配;连续级配的强度值明显大于单粒级配的强度,骨料越细,强度越高;随着水头的增大,无砂混凝土的渗透系数呈幂函数型增长,连续级配的渗透系数明显小于单粒级配渗透系数;通过配比优化,最终确定了现场的最佳施工配比为:水灰比0.45,灰骨比1∶6,水∶水泥∶石子=135.5∶301∶1806。分析结果可为类似工程的设计施工提供参考。
In order to explore the applicability of sand-free concrete in the lining of high groundwater channel slopes,the lining construction of a shale rock slope section of the South-to-North Water Transfer Project takes the effective porosity,strength and difference of the sand-free concrete under different mixing ratios. Penetration test under the water head. The results show that the larger the coarse particle size, the larger the effective porosity, the lower the effective porosity of the continuous gradation is than the single particle size gradation; the strength of the continuous grading is significantly greater than the strength of the single grading, the finer the aggregate The higher the strength; with the increase of the water head, the permeability coefficient of the sand-free concrete increases with a power function, and the permeability coefficient of the continuous gradation is significantly smaller than that of the single-grain gradation. Through the optimization of the ratio, the most The optimum construction ratio is: water cement ratio 0.45, gray bone ratio 1:6, water: cement: stone = 135.5:301:1806. The analysis results can provide reference for the design and construction of similar projects.
引文
[1]郭俊涛.无砂混凝土板渗流量影响因素分析[J].水利技术监督, 2018(3):176-178.
[2]吴成伟.无砂混凝土排水基层试验研究[D].长沙理工大学, 2013.
[3]黄亚梅,王立华,原闻洋.无砂混凝土新型河流生态护岸工程水力学特性研究[J].甘肃水利水电技术, 2018(1).
[4]郑伟,郭向红,李永业,等.无砂混凝土板在泥沙淤塞前后渗水效率试验研究[J].中国农村水利水电, 2015(7):149-152.
[5]卫佳,钟菘,王伟,等.浅析水灰比对高钛型高炉渣无砂混凝土渗透性的影响[J].四川建筑, 2017, 37(4):266-268.
[6]张学琴,徐海涛,张文娟.不同容重无砂混凝土板渗流特性的试验研究[J].浙江水利科技, 2017(06):34-36.
[7]谭相文.无砂混凝土板取水工程渗流特性综合分析[J].中国水能及电气化, 2017(3):63-66.
[8]吴党平.无砂混凝土在护坡工程中的应用[J].东北水利水电,2012, 30(4):30-31.
[9]徐飞,陈伟民.浅述环保型无砂混凝土在土石坝护坡中的研究及应用[J].中国科技投资, 2013(A27):401-401.
[10]黄岳文,王立华.沉管护脚结合无砂混凝土护坡在河道护岸中的应用[J].中国农村水利水电, 2018(3).