摘要
微团聚体是形成沉积物结构的基本单元,沉积物的结构性影响了土体的稳定性、渗透性和强度等工程地质性质。对废弃黄河口刁口流路潮间带沉积物微团聚体受黏粒含量、有机质和生物黏液等胶结作用进行分析,结果表明,研究区沉积物多团聚成粉粒级微团聚体(0.05～0.01 mm),含量在85.3%～95.8%之间,与黄土高原土相比,0.05～0.01 mm微团聚体增加,而0.1～0.05 mm微团聚体减少,团聚性差,易于侵蚀;黏粒含量与团聚度表现出显著正相关性,说明黏粒含量增加了沉积物微团聚体的稳定性;沉积物中有机质含量在0.27%～0.61%之间,有机质含量较少,对沉积物微团聚体贡献少;生物扰动的螃蟹洞壁土、螃蟹掘出物的团聚度明显大于表层未受生物扰动土的团聚度,说明螃蟹分泌的黏液能加大微团聚体的稳定性。
Aggregation is a basic unit to form sediment structure.The structure of sediments impacts on the stability,infiltration and strength of engineering geologic properties.A study was implemented in the abandoned riverway of Yellow River Estuary,Diaokou,on the influence of clay,organic matter and biologic EPS(extracellular polymeric substances) on the aggregation.The results indicate that the sediments mainly become 0.05~0.01 mm aggregation.The content of the aggregation is between 85.3% and 95.8%.Compared with...
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
2009年第1期31-37,共7页
Marine Geology & Quaternary Geology
基金
国家自然科学基金项目(40606020)
国家高新技术研究发展计划(2008AA09Z109)
关键词
微团聚体
黏粒
有机质
生物黏液
黄河口
aggregation
clay
organic matter
EPS（extracellular polymeric substances）
the Yellow River Estuary
