A Sand Box Test for Soil Disturbance due to Insertion of Small-scale Self-boring Tube

Abstract

This paper reports on a model test which discuss about the disturbed area of ground soil due to insert the freezing tube of “small-scale freezing sampling” method, which can be adopted in common soil boring works and takes less cost than conventional freezing sampling method. This study is focused on the effect of water flow rate and insertion velocity during inserting the self-boring freezing tube, and the disturbance around the tube is evaluated by the soil density and soil hardness. According to the result, a better water flow rate and insertion velocity with less disturbance, and the effectiveness of self-boring can be observed. However, it can also be found that the amount of discharged sand is not enough due to the plugging phenomenon of sand which occurred at the end of the self-boring freezing tube.