粗颗粒土渗透系数及土体渗透变形仪的研制

针对目前还没有合适的室内试验仪器测试巨粒混合土的渗透系数和巨粒混合土发生渗透破坏时的临界水力梯度的现状,研制了粗颗粒土渗透系数及土体渗透变形测试仪。该仪器最大的特点是根据巨粒混合土中含有细粒土致使土体难以饱和的特点,在仪器上设置了密封抽气饱和装置,可以对土样进行抽气饱和。结合工程实践对不同级配的土体进行了渗透及渗透变形试验,试验测得的土体渗透系数和临界水力梯度与理论计算的结果非常接近,部分试验成果已应用于工程实践。

Development of apparatus for measuring permeability coefficient and seepage deformation of coarse-grained soil

A new apparatus was developed for effectively measuring the permeability coefficient and critical hydraulic gradient under seepage failure of the coarse-grained soil in laboratory tests.In consideration of the factor that the fine-grained soil included in the coarse-grained soil makes it difficult for the soil to be saturated,sealed evacuating equipment was installed,so that the soil samples can reach the saturated state by air extracting.Seepage and seepage deformation tests on soils with different gradations were performed for some practical projects,and the measured data of the permeability coefficient and critical hydraulic gradient of the soil were quite close to the calculated results.Some results from experimental study have been applied to practical projects.