| Most successful engineering application examples indicatied that the method of hydro-fracture grouting for improving soft clay foundation can achieved the anticipative effect.This method has the following advantages,construction period is short,the cost is save and the treatment effect is good.However,because of the engineering characteristics of clay are influenced greatly by its microstructure,revealing the essential of the physical and mechanical behaviour of soil needs to master the change regulation of its microstructure.Basing on national natural science foundation project (No.40772174),in the article,the grouted result of soft clay foundation improvement by hydro-fracture grouting are studied.The main work can be concluded as follows:(1) Based on scanning electron microscopy and X-ray spectrometer, the common trace elements of the soft clay of were determined. The device project of laboratory equipment is expounded.The design method of the soft clay was discussed.(2) The main parameters of the soil pores are found by studying on the microstructure images of the soft clay before and after hydro-fracture grouting.(3) Mercury intrusion tests were employed on the original and compound soft clay and variation of pore distribution and pore distribution range of pore size were obtained.(4)By introducing the fractal geometry theory, introduceing the basic concept of fractal theory and the calculating method of fractal dimension,the fractal properties are studied by using Korcak fractal. |
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