摘要
针对南海钙质砂回填工程问题,采用环保高聚物改良钙质砂力学性能,开展不同工况条件下的固结压缩试验,分析不同颗粒级配、不同高聚物掺量条件下固化钙质砂的压缩变形特性;结合扫描电子显微镜(scanning electron microscope,SEM)试验,揭示高聚物对不同级配钙质砂压缩变形特征的微观改良机制。研究结果表明:高聚物对钙质砂颗粒的包裹性及颗粒间孔隙的填充性较好,可有效提高钙质砂颗粒间的黏聚力及抵抗变形能力;在高聚物掺量一致的条件下,高聚物对较粗颗粒钙质砂的改良效果优越于较细颗粒钙质砂的改良效果;在同一级配条件下,随着高聚物掺量的增高,钙质砂的体积应变和孔隙比增量显著减小,压缩系数明显减低,高聚物可大幅度改良钙质砂的压缩变形特性。
Based on the problem of calcareous sand in the backfill project,environmental polymer foam adhesive was used to improve the mechanical properties of calcareous sand.The compression deformation characteristics of the samples with different particle size distributions of calcareous sand and PFA dosage were analyzed by consolidation compression tests under different pressures.The microcosmic improvement mechanism of PFA on compression deformation characteristics of different graded calcareous sand was revealed by scanning electron microscope(SEM)test.The results show that PFA can effectively improve the cohesion between calcareous sand particles and the ability of resisting deformation of calcareous sand.The improved effect of PFA of coarse-grained calcareous sand is better than that of fine-grained calcareous sand under the same PFA dosage.With the increase of PFA dosage,the volume strain,void ratio increment and compression coefficient of calcareous sand decrease significantly under the same particle size distribution.PFA can greatly improve the compression deformation characteristics of calcareous sand.
作者
陈青生
张琎炜
彭弯
李宇轩
吴小康
CHEN Qingsheng;ZHANG Jinwei;PENG Wan;LI Yuxuan;WU Xiaokang(School of Civil and Environmental Engineering, Hubei University of Technology, Wuhan 430068, China)
出处
《中国科技论文》
CAS
北大核心
2021年第4期390-395,共6页
China Sciencepaper
基金
国家自然科学基金资助项目(51708189)。
关键词
岩石力学
钙质砂
高聚物
侧限压缩
rock mechanics
calcareous sand
polyurethane foam adhesive
confined compression
