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文中简叙应用常规三轴仪增设一套渗透压力装置进行低透水性土渗透系数测定的方法。试验时,对试样施加反压力,可使低渗透性细粒粘性土达到饱和;用三轴仪的体积变化量管测渗透水量读数准确,在试样外围包裹乳胶膜并加0.1～0.2公斤/厘米~2围压可以避免通常渗透试验中试样与环刀壁间的漏水。此方法可模拟现场应力状态进行试验,可用于测定10~(-9)～10~(-5)厘米/秒土的渗透系数。
This paper briefly describes the application of a conventional triaxial apparatus to add an osmotic pressure device to measure the permeability coefficient of low permeability soils. During the test, the back pressure is applied to the sample to make the low-permeability fine-grained clay saturated; the volumetric variation of the triaxial instrument is used to measure the amount of permeate water accurately, and the latex film is wrapped around the sample and added 0.1 to 0.2 kg. The confining pressure of /cm~2 can avoid the leakage between the sample and the wall of the ring in the normal penetration test. This method can simulate the on-site stress state and can be used to determine the permeability coefficient of 10~(-9)~10~(-5)cm/s.