Sandy Gravel Foundation Pore Characteristics And Permeability Properties Of Yuecheng Reservoir

Gravel sand gravel is the fourth century sediments loose coarse fragmentaccumulation which have distinctive features. Sandy gravel foundation is the commonuse of the water conservancy engineering and other engineering building foundation, ithas big pore, permeability is strong, and poor bearing capacity. According to thecharacteristics of layer, geomorphic geological structure and the relationship betweenthe combination of the weak permeable layer and space changes, sand gravel foundationlesson is divided into a single structure and complex structure.Although there are a lot of research on penetration, but most is limited to a specifictest materials, Due to the structural soil with complex, different areas of material hasuniqueness, So it don’t have broad applicability of forefathers’ research. Yuechengreservoir dam foundation of sandy gravel of commonality with sandy gravel layer, butalso has its features This article in view of the yuecheng reservoir dam foundationseepage problems of yuecheng reservoir dam foundation of the permeability of sandgravel materials, made a research and draw some rules for reference.In this paper, we study mainly on the following research:(1) The features of sandy gravel foundationThrough previous studies have found that the quaternary gravel stones of thefield position is different, its geological history also is not the same, but they are theresult of the interaction between external stress and internal stress constraints, is theproduct of the specific geological environment, rules to follow is to follow. Geneticdiversity and structure of the loose is the main characteristic of sand gravel geology.Sandy gravel foundation with large porosity and permeability strong features.Sandy gravel is composed of loose grain, grain, almost no connection between itsstability mainly by embedded extrusion and friction between the particles.(2) Indoor experiment, obtains the related parameter valuesBased on a large number of literature, the test of experimental study on the parametersof porosity, uneven coefficient and coefficient of curvature. Indoor test is divided intoparticles screening test, determination of porosity test, coefficient of permeability testthree small experiment. First two test main purpose is to determine the parameter values,coefficient of permeability test constant head method is used to measure permeabilitycoefficient under different gradation, in order to study the parameter value and therelationship between the coefficient of permeability. (3) Data analysis and processingPorosity, non-uniform coefficient, the curvature coefficient and permeabilitycoefficient for a dollar and multiple regression analysis, through the analysis of fineparticle content and permeability change get fine particle content is less than40%whenthe permeability coefficient decreases with the increase of the content of fine particleslowly, fine particle content more than40%, coefficient of permeability of fine particlecontent increases with the decrease sharply; The permeability coefficient is obtained bylinear regression analysis related to the porosity, coefficient of inhomogeneous linear;The permeability coefficient is associated with a cubic equation curvature. And got abetter expression of sandy gravel foundation the relationship between permeability andpore characteristics.