EN-1固化剂加固黄土的工程特性及其影响因素

Engineering properties and influencing factors of solidified loess by EN-1 solidifying agent

通过击实试验、直剪试验和渗透试验研究EN-1固化剂掺量、养护龄期、压实度和含水率因素对固化土强度和渗透特性的影响。结果表明:EN-1固化剂可显著增大土壤干密度,提高土壤抗剪强度和抗渗性,改善黄土的工程性能;随着固化剂掺量、养护龄期和压实度增大,固化土的抗剪强度指标内摩擦角和凝聚力呈上升趋势,渗透系数呈下降趋势;随着含水率的增大,内摩擦角和凝聚力呈下降趋势。在工程实践中,建议EN-1固化剂加固黄土的适宜掺量选择0.01%,养护龄期需要7 d以上,压实度至少控制在0.95以上,含水率略低于最优含水率。

The paper researched the effect of EN-1 solidifying agent content, curing age, compactness and water content on loess strength and seepage properties by compaction, shear strength and permeability tests. The result indicated that EN-1 solidifying agent can remarkably increase the dry density, shear strength and impermeability; improve the loess mechanical properties. Along with the increase of solidifying agent content, curing age and compactness, the cohesion and internal friction angle increases and the permeability decreases. Along with the increase of the water content, the cohesion and internal friction angle decreases. The paper suggested that the suitable mixing amount of EN-1 soil stabilizer is about 0.01%, the curing age is at least 7 d and the compactness is controlled above 0.95, the water content of solidified soil should under the optimum moisture content a little.