[关键词]
[摘要]
为拓展压实水泥土在黄土地基处理中的应用, 以水泥掺量、粉煤灰掺量和含水量为因素, 设计L9 ( 34 ) 正交试 验方案, 击实试验法成样, 试验研究了压实水泥黄土28 d 和56 d 的力学特性, 分析了各因素对水泥土的干密度、强 度和弹性模量的作用规律、作用机理, 弹性模量与强度的关系。结果表明: 粉煤灰掺量对压实水泥黄土的干密度影 响极显著, 含水量的影响显著, 水泥掺量的影响不显著。水泥黄土的最大干密度和最优含水量应考虑粉煤灰掺量的 影响, 可不考虑水泥掺量的影响。粉煤灰能显著提高压实水泥黄土的强度和弹性模量, 尤其是后期强度。水泥掺量 对压实水泥黄土两个龄期的强度和弹性模量影响均极显著, 粉煤灰掺量的后期影响极显著, 含水量的影响显著。
[Key word]
[Abstract]
In or der to ex pand the application of compacted soil- cement in loess foundation tr eatment, taking cement do sage, fly ash dosag e and w at er co ntent as factor s, an or thog onal experimental scheme L9 ( 34 ) w as car ried o ut to study the mechanical propert ies o f compacted cement loess at 28d and 56d. T he effect o f v arious factor s o n dry density, st reng th and elastic modulus, mechanism, r elationship between elastic mo dulus and str eng th w ere analyzed. The r esult s showed that t her e w as an ext remely signif icant inf luence of fly ash do sage on dr y density o f com pacted cement loess, followed by w ater content and but not fo und o f cement dosage. The influence o f fly ash dosage sho uld be taken into account w hen max imum dr y density and optimum water content o f cement soil ar e determined, the influence o f cement dosage can be ignor ed. Fly ash can significantly increase the strength and elastic modulus of compacted cement loess, especially the later strength. T he influence of cement do sage on strength and elast ic mo dulus o f compacted cement lo ess at tw o ages is ex tremely significant, as well as the fly ash do sage ; in ad2 dit ion, the w ater content also show ed a sig nificant influence effect.
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[基金项目]
长江学者和创新团队发展计划( IRT1067)