Linear Damping Coefficient Calibrated from 3D Numerical Simulation
Date Issued
2007
Date
2007
Author(s)
Juan, Hung-Bin
DOI
zh-TW
Abstract
This research is to understand the phenomenon which is caused by the collision between debris flow and riverbed , and to calibrate the linear damping coefficient from 3D numerical simulation .
First , we conducts experiments to simulate the collision between a heavy stuff and dry sands or fully saturated sands . Then , we use FFT to analysis the signals from the experiments.The characteristic frequencies are found to be between 0~250Hz , and the horizontal signals are bigger the vertical signals which implies some difference between horizontal and vertical distribution of sands. The qualitative analysis show us that the behavior of the energy decaying in the fully saturated sands approaches the behavior of the energy decaying by the point source applied on the semi-infinite space soil.
Second , we use linear elastic damped wave equation and finite difference method from the paper written by Grave(1996) to construct a 3D numerical model and to calibrate the linear damping coefficient. Then we get the linear damping coefficient about 4×105kg/m3s .
Subjects
地聲
土石流
有限差分
線彈性阻尼波動方程式
geophone
debris flow
finite difference
linear elastic damped wave equation
Type
thesis
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