摘要
以榆林市辖区电厂粉煤灰地基回填材料为研究对象,进行了强度室内试验和现场荷载试验,分别测定其物理力学特性。试验结果表明,粉煤灰的干密度较小,比一般土小约30~40%,γd/γs=0.51;在压实度为0.97、含水量为最优含水量条件下,0.2<a1~2<0.5MPa-1、3≤Es1~2≤10Mpa;粉煤灰不具塑性,本无粘聚力,但试验表明,当有一定的含水量时,其模量、强度及地基承载力都得到了很大的提高。
The foundation backfill materials with pulverized coal ash and admixture gypsum fly ash were studied in Yulin, and the project of foundation treatment methods were provided for similar engineering. The laboratory exper- iment including strength, compressibility, mix proportion of the gypsum fly ash and in - situ loading test were de- signed to determine its physical properties. The result shows that fly ash dry density is smaller than the general soil when^dA/s = 0.51, compaction degree is 0.97, and at the optimum water content , the parameters ：0.2 〈 al - 2 〈 0.5MPa- 1,3≤Esl -2≤10MPa;fly ash has no plastic and cohesion, and the experiments also show that, when there is a certain moisture content, it has a apparent cohesion, and by adding some gypsum modified fly ashes, its modulus, strength and bearing capacity of foundation have been greatly improved.
出处
《榆林学院学报》
2014年第2期5-8,共4页
Journal of Yulin University
关键词
地基回填
粉煤灰
室内试验
荷载试验
backfill
fly ash
laboratory experiment
in - situ loading test
compacted degree
mix proportion
