| 邵艳,马士雨.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(3):18-24 |
| 合肥滨湖新区软土固化最优配比的试验研究 |
| Experiment on Optimum Mixing Ratio for Soft Soil Solidification in Binhu New Area of Hefei |
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| DOI： |
| 中文关键词: 粒化高炉矿渣微粉 MgO Na2SiO3 中心组合试验设计法 交互作用 最优配合比 |
| 英文关键词: ground granulated blast slag MgO Na2SiO3 central composite cesign interaction optimum ratio |
| 基金项目:安徽省高校自然科学研究项目（NOKJ2016A152） |
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| 中文摘要: |
| 选择粒化高炉矿渣微粉（Ground Granulated Blast Slag，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 7 d 和 28 d 的固化土无侧限抗压强度。通过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 7 d 和 28 d 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，7 d 养护龄期下 GGBS 和 MgO 的交互作用显著，而 28 d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，7 d 与 28 d 的预测抗压强度分别为 1 015.04 kPa 与1 166.48 kPa。最后分别对养护 7 d 和 28 d 固化土的实测抗压强度值与预测抗压强度值进行对比分析后，得到实测值与预测值相接近，故此试验研究成果可为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: |
| To cure the soft soil in Binhu New Area of Hefei，ground granulated blast slag （GGBS） was selected as the curingagent，and MgO and Na2SiO3 as the activator. The influencing factors were the amount of GGBS，MgO and Na2SiO3，and the responsevalues were the unconfined compressive strength of the cured soil cured for 7 d and 28 d. The optimum ratio of the three admixtureswas determined by the central composite design （CCD） method. The results showed that the surface and linear effects of the threeadmixtures on unconfined compressive strength of the cured soil were significant after 7 d and 28 d curing. Besides，the interactionsbetween chemicals were different：the interaction between GGBS and MgO under 7 d curing was significant，while the interactionbetween GGBS and Na2SiO3 under 28 d curing was significant. The optimal ratios of GGBS，MgO and Na2SiO3 were 12.46%，3.90% and 6.73%，respectively，and the predicted compressive strengths at 7 d and 28 d with the ratio above were 1 015.04 kPa and1 166.48 kPa，respectively. The actual and predicted compressive strength values of cured soil at 7 d and 28 d were close. Theexperimental results can provide reference for the formulation of slag-based composite curing agent in the similar project. |
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