Evaluate the Effect of Pre-cut Trenches on Underwater Marine Sediment Sliding using Discrete Element Method and Taguchi Orthogonal Array

• Main Authors: Daniel Thomas Chou, 周子健
• Other Authors: Hung-Jiun Liao
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/4pt69v

碩士 === 國立臺灣科技大學 === 營建工程系 === 106 === The issues of reservoir desilting in Taiwan have become a crucial problem for the national security, it causes the quality deterioration of running water and the reduction of reservoir storage. Although many efforts have been tried to develop methods and to improve the efficiency of reservoir desilting in the recent years, the problem of desilting is still remained. The purpose of this study is to propose a continuous landslide mechanism to increase the efficiency of reservoir desilting through discharging tunnel, it uses a series of pre-cut cavities in the reservoir sediment to trigger the continuous landslide mechanism. The cavities are created using high pressure water jetting method which is commonly used in the jet grouting practice. This study is conducted by using Discrete Element Method (DEM) coupled with Computational Fluid Dynamics (CFD). It focuses on describing the relationship between layout and dimension of jet cutting cavity and the efficiency of reservoir desilting. The Taguchi Orthogonal Array is adopted here to solve the muti-parameters problem of this study. The results of this study show that the efficiency of desilting by jet cutting trenches in the sediment slope can be quantified and the optimal layout and dimension of cavities to maximige the desilting efficiency is proposed.