Study On The Coarse-grained Soil Permeability Characteristic

The soil is a progeny of the earth crust mother rock strong weathering, is various aggregations of mineral grain, then the coarse-grained soil indicates generally the thicker soil of the grain diameter. The soil conduct constructs the foundation or building the material all have the extensive application up to now from the antiquity, the theories research of the soil is from the European Industrial Revolution, but the theories research of the soil generally accepted for from Terzaghi announced in 1925 in the world the first soil mechanics particularly. There have had already for more than 80 years from the time to now, the people's research to the soil also obtained the glorious theories result, these results guided the developing of the modern city building industry, the transportation industry, the water conservancy building industry etc..People obtained the glorious theories result, but the target that people studied belong to the category of the fine-grained soil mostly, there were few system discussions about the coarse-grained soil in the primitive published the works, with the development of the geotechincal engineering, the coarse-grained soil as a building material has been wide applied more and more. In recent years, a few experts of the soil mechanics also start throwing the aim to the theories of a soil research, and obtained some worthy theories results. Such as,Liu jie writed"the Soil Permeability Stability and Seepage Flow Control", Guo Qingguo writed"the engineering characteristic and applications of the coarse-grained soil", is the typical representative of the coarse-grained soil research theories result.There are many advantages on the construction engineerings to the coarse-grained soil. People make use of its advantage on the water conservancy construct, at the same time, its disadvantageous characteristic also cannot disregard, the big permeability coefficient, the bad permeability stability, the easy occurrence dam body leakage and the seepage breakage and etc.,are all its the biggest weakness.In order to deep holding the engineering characteristic of the coarse-grained soil, this paper researched object that is the coarse-grained soil of the diametre from 0.1mm to 20mm that was often applied in the dam body filter structure, using the experiment method, carrying out the experiment the research of the coarse-grained soil permeability characteristic. The effect is mostly the permeability coefficient and permeability deformation of the coarse-grained soil in the density and the graded, building up a permeability coefficient model...