宁波前湾新区深部高液限黏土微观结构研究

Phase Analysis and Scanning Electron Microscopy of Deep High Liquid Limit Clay in Qianwan New Area,Ningbo

黏土的微观结构严重影响着其工程性质。本文以物相分析与扫描电镜试验分析两种手段,重点对宁波前湾新区深部高液限黏土开展了微观结构研究,结果表明:(1)黏土化学成分以SiO_(2)和Al_(2)O_(3)为主,矿物成分以伊利石为主;(2)扫描电镜试验结果显示,浅部、深部土样试验结果总体较为接近,土层整体分布均匀。该黏土主要以角、边与面或边与边的絮凝状结构搭接排列,比较均匀,且各向同性较好。与浅部土相比,深部土的孔隙数量增加但平均直径减少。

The microstructure of clay seriously affects its engineering properties.In this paper,the microstructure of deep high liquid limit clay in the Qianwan New Area of Ningbo is studied from two aspects:phase analysis and scanning electron microscope test analysis.The results show that:(1)The chemical composition of clay is mainly SiO_(2) and Al_(2)O_(3),and the mineral composition is mainly illite;(2)According to the test results of scanning electron microscope,the overall distribution of soil layers is uniform,and the test results of shallow and deep soil samples are generally close.The clay is mainly arranged by the overlapping of corners,edges and faces or edges and edges,that is a flocculated structure,which is relatively uniform and isotropic.Compared with the shallow soil,the number of pores in the deep soil increases but the average diameter decreases.