关键词: 负压排水;粉土;排水管内径;排水路径;排水速率;

Abstract: In order to verify the effectiveness of negative pressure drainage in silt soil, an indoor cylinder physical model test was designed. During the test, the negative pressure value and drainage volume were monitored, and the average drainage rate was calculated through the drainage volume. By using drainage pipes with different inner diameters and changing the drainage path several times, the negative pressure drainage law of silt soil was studied. The test results showed that: (1) Under certain conditions, the negative pressure drainage method can achieve efficient drainage in silt. But being different from sandy soil, due to the small permeability coefficient of silt, the stabilizing time of the negative pressure during the drainage process was significantly longer. (2) The inner diameter of the drainage pipe affected the negative pressure drainage effect. When the pipe diameter was large, such as 6.5 mm, because the infiltration volume was not enough to form a full pipe flow to induce a siphon effect, it was difficult to generate a stable negative pressure, and the drainage rate was lower than that of a 4 mm inner diameter drainage pipe, indicating that the negative pressure drainage significantly improved the drainage rate. (3) The drainage path had a certain impact on the drainage rate. By increasing the drainage height difference, increasing the inclination of the draina

Key words: drainage of negative pressure; silt soil; internal diameter of drainage pipe; drainage path; drainage rate