NGUYEN BAO TRUNG
Experimental study on liquefaction measures of soil by drainage pipe
Ohtsuka Satoru
Up to now, Many different methods against the liquefaction soil was conducted for large area. Small area as resident did not conduct because of the high cost and large machine. Therefore, it is necessary to catch a new method against prediction of consolidated region by liquefaction of soil. Thus, ¡Èdrainage pipe construction method¡É has been proposed as a countermeasure method. Drainage pipe construction method is a method using vinyl chloride pipe that drilled a hole to dissipate excess pore water pressure. If this method could be used, it makes low cost and smaller construction machinery. It appropriated for resident in Japan. In this research, shaking table test has been used to evaluate the feature of this method. 3 cases have conducted. In this study, water pluviation method using the Tohoku silica sand No. 6 has been created. Case A: define experiment model. Case B: the drainage pipe arranged in a square shape and evaluate the feature of experiment by changing the pitch distance. Case C: pipe arranged around building and pipe arranged under building. In this research, ground was created in water pluviation method using the Tohoku silica sand No.6. Experiment model in case C has 200¡ß200¡ß78(mm) size and 2.06(kg) weight. In Case A silicon pipe with 150(mm) length, 10(mm)diameter. The result shows that the 1(mm)diameter of holes are suitable. Therefore, this pipe used for Case B and Case C. In case B, the pitch distance B increase, the excess pore water pressure and settlement increase. The results show that the pitch distance B=20(cm) the efficient drainage totally disappeared. The pitch distance (B=5cm) is narrow the excess pore water at 4.5(cm) depth and 9.0(cm) depth are the same. At 9cm depth, excess pore water pressure ratio is 0.5 which could be prevented liquefaction of soil. At 4.5cm depth, excess pore water pressure ratio is 0.8 which couldn¡Çt prevent. The relationship between excess pore pressure ratio and a/b shows that this method is the same trend with drainage method. The results from Case C show that using a pipe around building and doesn¡Çt pipe are the same, so that this Case C is not sufficient. In Case C pipe under building, it can support for building. However, it is difficult to measure accurately
Please use "previous botton" to return the previous page