Analysis of Blocking Ratio by Soil Molecule Aggregate

• Main Authors: Chiang YehLiu, 葉劉檣
• Other Authors: 張德鑫
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/04014436523563092230

碩士 === 中原大學 === 土木工程研究所 === 96 === The article treats relation between coefficient of permeability of sand and blocking magnitude, by permeameter obtains coefficient of permeability of sand, porosity, blocking magnitude and so on, differentiates theory method and actual value to compare blocking magnitude, and corrects theory method in order to accord with actual condition. The permeameter uses normal sand, compound sand, live sand to do pure water permeameter and cloudy water permeameter. First, separates nine layer from experimental sand to do pure water permeameter, measures flow of every time and different water of every layer, then uses the Darcy's law deduce coefficient of permeability of every layer, follow emptying molecule sand of pass two hundred number normal sieve to experimental device does cloudy water permeameter, measures change of flow of every time and different water of every layer,then deduces coefficient of permeability of every time and every layer, the result of cloudy water permeameter shows, the coefficient of permeability of normal sand is maximum, compound sand is second, live sand is least, and change of flow is opposite. From the change of different water of cloudy water permeameter knows, stratosphere different water is large greater than other layer, show blocking condition exists in stratosphere, then computes blocking magnitude, differentiate theory approximate method and actual observation method gets blocking magnitude. Before using theory method, needs to correct particle size distribution, because enter molecule sand of pass two hundred number normal sieve changes original particle size distribution, so needs to correct particle size distribution once again. After compares theory approximate value and actual observation value, obtains difference of them. The result shows, the theory approximate value and actual observation value of normal sand is close, compound sand is second, live sand is large difference. The normal sand differentiates 2.49 times, the compound sand differentiates 8.08 times, the live sand differentiates 8.30 times.