Abstract

In recent years, laser particle analysis method is a new method in geotechnical particle analysis. In this paper, through the particle analysis test of typical soft soil, the differences and control parameters between it and densimeter method are compared. The main conclusions are as follows: (1) the light shading percentage should be controlled between 5% and 20%;the concentration of dispersant (sodium hexametaphosphate) should be 0.04%;the circulating speed of centrifugal pump should be controlled between 1200-2000 RPM. (2) Compared with densitometer, the content of colloidal particles (< 0.002mm) and sand particles (> 0.075mm) measured by analysis method is different, and the content of clay particles (< 0.005mm), silt particles (0.005-0.075mm) and D50 is basically the same.

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