试验室测定土样的渗透系数─—通常使用以下几种试验设备：南55型渗透仪、70型渗透仪和土样管渗透仪。其中，70型渗透仪和土样管渗透仪适用于粗粒土，其试样是以扰动土样分层压实制成；南55型渗透仪适用于细粒土（原状土或扰动上）。因此，试验室测定粘性土样的渗透系数，通常 The laboratory tests the permeability coefficient of the soil sample--usually the following test equipment is used: South 55 permeameter, 70 permeameter and soil sample tube permeameter. Among them, the 70-type permeameter and soil sample tube permeameter are suitable for coarse-grained soil, and the sample is made by stratified compaction of the disturbed soil sample; the South 55 permeameter is suitable for fine-grained soil (undisturbed soil or disturbance). . Therefore, the laboratory determines the permeability coefficient of clay soils, usually