Research Of Hydraulic Characteristics Of Various Average Diameter Of Broken Stone Seepage

Broken Stone is mechanically broken by the natural rock and sc reening, it is a partic le diameter that is Relatively uniform particulate material, and it is widespread used of the construction industry. From physical form and nature, Broken Stone is a tack-free large-s ized particles of soil, compared with the small size of the partic les of soil, and there is strong permeability, high capacity, small deformation subsidence engineering advantages. Broken Stone is used increasingly widespread in Real life, the production process. Not only can be used as concrete aggregate, and also be used in railway and highway roadbed, rockfill dam, seepage water drainage works and embankment dams. As a filter layer materials, the foundation materials processing and other aspects, broken stone also account for a large proportion. To make the Broken Stone used in practical engineering more convenient, we need to combine engineering, established hydraulic model, to study the hydraulic characteristics of Broken Stone seepage.Combined with Broken Stone in practical engineering, by establishing a model test system, Regulating the different working head for different sizes of Broken Stone penetration study on the hydraulic characteristics of Broken Stone seepage study,we get following conclusions:1. Broken Stone medium withstand working head higher, its seepage discharge is greater, but with the further increase in the working head, seepage flow is gradually stabilized; Broken Stone seepage flow was a negative correlation between partic le size, the larger the partic le size under the same working head, the greater the flow.2. Converted Relation between broken Stone seepage flow and work head to the Relationship between the seepage velocity and hydraulic gradient of seepage by formula, then analyze the impact of diameter on its hydraulic gradient, then we got that the broken Stone and hydraulic gradient diameter s ize was negatively correlated, Broken Stone smaller partic le s ize, the greater the hydraulic gradient in the flow process. A simple model is established, then introduced hydraulic radius for analysis. The greater Hydraulic radius, the flow of water seepage in the process of being greater the Resistance, so that the hydraulic gradient is greater. After analys is calculated: Broken Stone smaller the particle size, the entire permeate medium hydraulic radius greater, so the greater the hydraulic gradient in the flow process.3. For diameter D = 1cm Broken Stone seepage, the entire testing process seepage flow state changes to laminar flow, then flow into the transition, with the flow velocity increases, and finally will enter fully turbulent flow Regime; For Broken Stone diameter D = 2cm seepage, the seepage process again, seepage flow state by the rapid transition into turbulent flow fast; As for the partic le diameter D = 5cm Broken Stone seepage, the whole process of seepage flow is completely turbulent flow Regime; Compare each size gravel seepage on the critical velocity, not difficult to find, on the critical velocity and diameter size Broken Stone negative correlation, that is, the smaller the particle size the greater the flow of Broken Stone on the critical velocity;4. Calculated using the dimens ional analysis,we get one for this gravel seepage discharge test and the empirical formula of the working head :Using Origin software, combined with the actual flow test, taking into account various factors affect a flow gradient, binding dimensional analys is of the experimental data were fitted to give the empirical formula of j=39.85d^-2n^-3.53g^-1vv+1.05d^-1n^3.26gv²,Its applicability and rationality to verify the accuracy of the equation obtained can be Relatively high precise calculations gravel seepage hydraulic gradient and flow velocity, mo re reasonable description of the process flow when the gravel seepage, and the actual match.5、Use SPSS data processing software, multiple linear Regression equation, several factors influence the extent gravel seepage analys is, the degree of porosity for the penetration of the medium influence descending Respectively, working head, the kinematic viscosity of water, and both the seepage flow was positively correlated.In this paper, the Research on hydraulic characteristics average diameter Broken Stone seepage has an important reference in practical engineering, and it also can provides a reference value for further Research on the Broken Stone seepage.