Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/93678
標題: The Maximum Impact Force from a Rock-fall for Rock-Shed Slab Design
考量落石引致最大衝擊力於明隧道頂板設計之研究
作者: Chia-Ming Lo
Kai-Jie Chang
羅佳明
張凱傑
關鍵字: Maximum impact force;rock-shed slab;physical experiment;discrete element method;最大衝擊力;明隧道頂板;分離元素法;物理模型試驗
Project: 中華水土保持, Volume 46, Issue 4, Page(s) 197-204.
摘要: 
This study estimates the maximum impact force for a rock-shed slab in a rockfall. A discrete element program is calibrated using small-scale physical experiments and is then used to model the movement for a large scale rock-fall and to measure the impact forces. The results from the small-scale experiments show that the maximum impact forces are significantly affected by the mass of the rock-fall, the height from which the rock falls and the falling process. The full-scale numerical modeling for a field case confirms these experimental results and demonstrates the effect of rock-fall modes and the contact stiffness between the rock and the rock-shed. This study provides guidelines for the design of rock-shed structures where there are large rock-fall problems.

本文主要利用數值模擬評估大規模落石之最大衝擊力,藉此作為國內明隧道頂板結構設計之參考。而數值模擬主要採用分離元素法,經由物理模型試驗進行比對驗證後,進行大規模落石運動過程模擬與衝擊力量測。物理模型試驗結果顯示,落石引致之最大衝擊力主要由落石量、落距與崩落過程等因素影響最為顯著。由全尺度數值模擬結果顯示,其除可滿足物理模型之落石衝擊行為外,對於崩落型式、落石材料與明隧道頂板間之接觸勁度亦可量化出其影響特性,故對於明隧道頂板設計或陡坡危岩處理考量上,應可最為後續研究與工程防護設計之參考。
URI: http://hdl.handle.net/11455/93678
Appears in Collections:第46卷 第04期

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