摘要
研究目的:以往对硅藻土的研究多集中于化工、建筑等领域,对其工程性质,如结构、成分及其与物理、力学性质之间的关系研究尚不深入。本文通过室内外试验研究,以浙江嵊州硅藻土为研究对象,并将其与黏性土、软土和黏土岩等常见岩土对比分析,更深地揭示三种颜色(白、兰、黑)硅藻土的工程特性、结构、成分特征及其沉积环境。研究结论:(1)浙江硅藻土普遍富黏土矿物,具有特大孔隙、含水率高、透水性差等特征,硅藻的硅质残壳含有多级孔隙,这是其既能富水,结构强度又比一般土更高的本质原因;(2)白色硅藻土埋藏浅、反复干湿交替,是其与兰色硅藻土工程性质分化的关键过程;黑色硅藻土富有机质,是其工程性质和颜色与白色、兰色硅藻土差异化的关键因素;(3)浙江硅藻土的沉积环境温暖潮湿,同时期火山活动对其形成至关重要;(4)本研究可为该地区硅藻土研究、灾害治理及工程建设提供参考及依据。
Research purposes:Former studies on diatomite focus on chemical product and architecture,etc.There is still no further research on engineering characters,such as composition and structural features and their relationships with physical and mechanical properties.Taking the diatomite in Zhejiang Shengzhou as the research object,this paper tries to reveal its engineering,structure,ingredient features and sedimentary environment by laboratory and in-situ test together with comparing common rock-soil,as clay,mollisol and lutite.Research conclusions:(1)Diatomite in Zhejiang is generally rich in clay minerals,with high-content water,poor permeability and extra large pores.Multilevel pores in the diatomite are the key point for diatomite to remain higher structural strength than normal type soil with high water content.(2)The white diatomite is buried shallow and the alternating between dry and wet is the key process of its differentiation from blue diatomite;Riching in organic material is the significant difference between black and white,blue diatomite.(3)The sedimentary environment of diatomite in Zhejiang is warm and moist,and contemporaneous volcanism plays a crucial role for the diatomite formation in Zhejiang.(4)The research result can provide a reference for diatomite study,hazard control and engineering construction in this area.
作者
马元
MA Yuan(China Railway Design Corporation,Tianjin 300251,China)
出处
《铁道工程学报》
EI
北大核心
2019年第12期17-22,共6页
Journal of Railway Engineering Society
关键词
硅藻土
扫描电镜
工程特性
多级孔隙
diatomite
scanning electron microscope
engineering characteristic
multilevel pore
