聚丙烯酰胺改性石灰固化吹填土固结特性研究

发布时间：2018-04-15 10:11

本文选题：聚丙烯酰胺 + 石灰　；参考：《岩土工程学报》2017年S2期

【摘要】：吹填土加固技术成为当前软基处理的一项技术难点。石灰等固化材料的掺加提升了吹填土的抗压、抗剪强度,但降低了其抗变形能力。通过添加不同掺量的聚丙烯酰胺,利用室内一维固结压缩试验探讨其对石灰固化吹填土的固结特性的影响,并对固结后的土样进行了压汞试验分析,探讨了微观孔隙特征与宏观变形特性的相关性。研究表明:聚丙烯酰胺可以有效改善石灰加固吹填土的抵抗变形能力,改善其脆性破坏的特点;聚丙烯酰胺掺加增强了石灰加固吹填土体的结构性特征,结构屈服应力较单一石灰添加提高了54%;聚丙烯酰胺的增加提高了石灰固化吹填土的固结系数,且掺加量越大,固结速率的提升幅度越大;聚丙烯酰胺、石灰的组合掺加可以改善吹填土固结后的孔径分布特征,相同石灰掺加量下,随着PAM含量的增加,加固土体的大直径孔隙的含量不断增多,渗透性增强,固结速率增大,微观孔隙特征与宏观变形特性保持了内在的一致性。
[Abstract]:The technology of fill-fill reinforcement has become a technical difficulty in soft foundation treatment at present.The addition of lime and other solidified materials increases the compressive and shear strength of the blow fill, but reduces its deformation resistance.By adding different amount of polyacrylamide, the influence of the consolidation characteristics of lime solidified blow filled soil on the consolidation characteristics of lime solidified blow filled soil was discussed by using the one dimensional consolidation compression test in laboratory. The mercury injection test analysis was carried out on the soil sample after consolidation.The correlation between microscopic pore characteristics and macroscopic deformation characteristics is discussed.The results show that polyacrylamide can effectively improve the deformation resistance and brittle failure characteristics of lime reinforced fill soil, and the structural characteristics of lime reinforced fill soil can be enhanced by adding polyacrylamide.The yield stress of structure increased 54% than that of single lime addition, the consolidation coefficient of lime solidified blow filled soil increased with the increase of polyacrylamide, and the consolidation rate increased with the addition of polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide, polyacrylamide,The combined addition of lime can improve the pore size distribution after consolidation. With the increase of PAM content, the content of large diameter pores in the reinforced soil increases, the permeability increases, and the consolidation rate increases with the same lime content.The microscopic pore characteristics are consistent with the macroscopic deformation characteristics.
【作者单位】：天津大学土木工程系;天津大学滨海土木工程结构与安全教育部重点实验室;江苏鑫泰岩土科技有限公司;
【基金】：国家自然科学基金面上项目(51578371,51378344) 天津市自然科学基金项目(京津冀合作专项项目)(16JCJDJ C40000);天津市自然科学基金项目(14JCYBJ C21700)
【分类号】：TU472

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