Abstract:In view of the defects of the existing apparatus for measuring seepage deformation such as poor seal,seepage areas decreased by sample fix installation,complication of apparatus,etc,a new type of apparatus that can be used to measure the seepage characteristic of cohesive soil and cement soil is developed based on the analysis of the characteristic and testing theory of seepage deformation of soil. The apparatus has some unique designs such as adopting flexible seal method in which the samples are wrap by rubber membrane with confining pressure,and a ring porous stone is used on the top of the specimen to fix it,etc.. The apparatus can be used to measure seepage coefficient and deformation,and it can guarantee the effective seepage area of specimen in test and permit the test specimen to produce seepage deformation at the same time,and the seal quality of apparatus is good under the seepage hydraulic pressure in the test. The practical application indicates that the seepage coefficient and deformation and the ratio of resistance seepage slope of soil obtained by the proposed apparatus have high reliability and precision.