| 马士雨,邵艳.合肥滨湖新区软土固化最优配比的试验研究[J].安徽建筑大学学报,2022,30(): |
| 合肥滨湖新区软土固化最优配比的试验研究 |
| Experiment on optimal proportion of soft soil solidification in Hefei Binhu New District |
| 投稿时间：2021-06-23 修订日期：2021-10-29 |
| DOI： |
| 中文关键词: 粒化高炉矿渣微粉 MgO Na2SiO3 旋转中心组合试验设计法 交互作用 最优配合比 |
| 英文关键词: Granulated blast furnace slag powder MgO Na2SiO3 rotating center combination test design method interaction optimal mixture ratio |
| 基金项目:安徽省高校自然科学研究项目 |
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| 摘要点击次数: 1572 |
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| 中文摘要: |
| 选择粒化高炉矿渣微粉 (Granulated blast furnace slag powder，简称GGBS)作为固化剂，MgO和Na2SiO3作为激发剂固化合肥滨湖软土。其中影响因子为GGBS、MgO、Na2SiO3的掺量，响应值为养护7d和28d的固化土无侧限抗压强度。通过旋转中心组合试验设计法（Central Composite Design，简称CCD法）确定三种外掺剂的最优配合比。 研究表明：经过7d和28d的养护，三种外掺剂对固化土的无侧限抗压强度的曲面和线性效应均显著；两两因素之间的交互作用有着一定的区别，7d养护龄期下GGBS和MgO的交互作用显著，而28d养护龄期下GGBS和Na2SiO3的交互作用显著。试验得出：GGBS、MgO与Na2SiO3三掺量固化软土的最优配合比分别为12.46% 、3.90% 与6.73%；在最优配合比条件下，7d与28d的预测抗压强度分别为1015.04kPa与1166.48kPa。最后分别对养护7d和28d固化土的实际抗压强度值与预测抗压强度值进行对比分析后，得到实际值与预测值相接近，故此试验研究成果对实际软土固化工程的矿渣类复合固化剂配方提供参考依据。 |
| 英文摘要: |
| Granulated blast furnace slag powder (GGBS) was selected as curing agent, and MgO and Na2SiO3 were used as excitant to cure muddy soft soil of Hefei lakeside. Taking the content of three factors as the Granulated blast furnace slag slag slag powder (GGBS) was selected as curing agent, Mgo and Sodium Silicate as activator to cure lakeside soft soil in Hefei. The influence factors are GGBS, MgO and Na2SiO3, and the response values are unconfined compressive strength of solidified soil cured for 7d and 28d. The optimum proportion of the three admixtures was determined by the Central Composite Design (CCD) method. The results show that after 7d and 28d curing, the surface and linear effects of three additives on unconfined compressive strength of solidified soil are significant. The interaction between GGBS and MgO was more significant in the 7d curing period, and that between GGBS and sodium silicate was more significant in the 28d curing period. The tests show that the optimum mixing ratios of GGBS, MgO and Na2SiO3 are 12.46% , 3.9% and 6.73% respectively, and under the optimum mixing ratio, the predicted compressive strength for 7 days and 28 days are 1015.04 kPa and 1166.48 kPa respectively. Finally, the actual and predicted compressive strength values of curing soil for 7d and 28d were compared and analyzed respectively, and the actual value was close to the predicted value. Therefore, the experimental research results can provide reference for the formulation of slag compound curing agent in practical soft soil curing engineering. |
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