【作者】 郭鹏；

【导师】 刘香； 吴永博；

【作者基本信息】 内蒙古科技大学 ， 建筑与土木工程， 2014， 硕士

【摘要】 高炉渣是钢铁冶炼过程中从高炉中排出的固体废物，其作为潜在的宝贵资源，吸引愈来愈多国内钢铁企业及相关科研单位的广泛关注。目前，我国钢铁产量居世界第一，然而高炉渣的综合利用率却较低。高炉渣的堆放占据了大量的农田、土地，不但浪费了资源还严重污染着环境。因此本文以包钢新体系项目为依托，对高炉渣混合料的性能及改良回填地基的应用展开研究，以期在高炉渣用于地基回填的实际工程中起到指导作用。主要内容及结论有：1.通过密度试验、孔隙率试验、颗粒分析试验、重型击实试验和放射性检验与稳定性检验，对包钢高炉渣的物理化学特性进行分析，结果表明：包钢高炉渣天然重度为14.36kN/m3，放射性低，满足规范要求；其体积安定性好、无腐蚀性、无毒性；渣体含有较多孔隙，粗颗粒含量较大，通过掺拌一定比例的细料，能够用于工程回填。2.设计了五组包钢高炉渣、粉煤灰及包头本地砂土的不同含量的混合料。通过对其进行大型直剪试验，结果显示填料抗剪强度的主要控制因素是粗料含量，在P5=60%~75%的范围抗剪强度容易得到最大值，砂的添加不仅增加了填料中的细料，改良了级配，提高了抗剪强度，其中P5=65%~70%时密实效果最好，抗剪强度较高。3.通过对五组混合料进行大型压缩试验，得到了混合料在分级加载、分级卸载和再分级加载不同阶段的压缩指标。与原方案对比可知，压缩模量明显提高，改良效果显著。可将掺加砂土的P5=62%~68%范围作为填料的控制范围，对应原料配合比为原矿渣66%~73%，粉煤灰3%~4%，砂土30%~23%，含水率控制在4%左右。4.根据包钢高炉渣及改良混合料的特点，结合工程背景提出分层碾压—强夯加固的施工方案，并对两个施工工艺进行了简要的说明，针对施工方案的注意事项给出了建议。更多还原

【Abstract】 Blast furnace slag is solid waste exhausted from blast furnace in iron and steel smelting process. As a potential valuable resource, blast furnace slag attract more and more attention of domestic iron and steel enterprises and the relevant scientific institutions. Steel output of our country ranks first in the world, but the comprehensive utilization ratio of blast furnace slag is low. Stacking of blast furnace slag takes up a large amount of farmland, land, not only wastes the resources but also pollutes the environment seriously. Relying on Baotou steel new system project, the performance of the blast furnace slag mixture and application of modified backfill foundation have been researched in this paper to play an guidance role in practical engineering that the blast furnace slag used to fill in the foundation. The main contents and conclusions are as follow:1. The analysis of the physical and chemical properties of Baotou steel blast furnace slag have been made through density text, porosity text, grain analyses text, the heavy compaction test,radioactive assay and stability test, research shows that natural unit weight of Baotou steel blast furnace slag is14.36kN/m3, it’s radioactivity satisfy requirements of the design code.The cubage stability of Baotou steel blast furnace slag is good, it is noncorrosive and nontoxic. Blast furnace slag contains many pores, the content of coarse particles is larger, it can be used for engineering backfill by blending a percentage of fine fractions.2. This paper designs five groups of mixture which is composed of different content of blast furnace slag, fly ash and Baotou local sand. Through large direct shear test for five groups of mixture, results show that the main control factor of the shear strength is the content of coarse material. Shear strength get maximum value in the range of P5=60～75%. Adding sand not only increase the fines, improved the gradation, but also increases the shear strength. When P5=65-70%, the compacting effect is the best, filler has high shear strength.3. Compressed indexes of mixture under multi-stage loading、offloading by steps multi-stage loading again can be get through large compression test for five groups of mixture. Compared with the original scheme, the compression modulus values of modified mixture obviously increased, the effect of modifing is significant. Range of P5=62～68%mixed with sand can be made as the filler control range. The matching raw material mix ratio is:original slag66～73%, fly ash3～4%, sand30～23%, moisture content around4%.4. According to the characteristics of blast furnace slag and modified mixture, combined with engineering background, this paper put forward the separation rolling dynamic compaction construction scheme. And briefly explain both of the construction technology. Some advice given for the attention of the construction scheme.更多还原