Study On The Solidification Mechanism And Treating Technique Of Organic Silt

Dredging is a usual method for shipping, port maintenance, and lake pollution control, in such projects many dredged sediments will be produced. Among dredged sediments, quite a portion come from polluted lakes and rivers, because such polluted sediments usually contain some organic matters. Although the content of organic matters are much less than silt, but it seriously affected silt solidification effect, and this is a new subject in silt solidification research.In this paper, the influence of organic matter content on silt solidification effect was focused on. Through laboratory experiments, studied the influence causing and degree of organic matter affect silt solidification. Disclosed the relationship of organic matter content and solidification effect, and proposed a method for high organic silt disposing.The main works of this paper are as follows:(1) Studied two different organic content silt Wuxi Wulihu silt and Shenzhen Dayawan Silt through single material (cement) solidification experiments. Compared the solidification effect of the two silt, through the experiments conferred that organic matter remarkable affect cement solidification effect.(2) Quantitively studied the solidification effect of different organic matter content silt, make clear the relationship of organic matter content and solidification effect.(3) From soil mechanical properties improving mechanism, combined with the difference of different organic matter content and mechanical properties deeply discussed the mechanism of solidification, built the relationship of macro mechanical properties and micro-mechanism.(4) As to different organic silt, make use of cement-gypsum compound material as solidification additives for silt solidification, comparatively studied the solidification effect, summarized the improving rule of gypsum to cement and proposed a method for treating high organic matter content silt.