應用高精度數值地形模型於三維落石問題分析

Three-dimensional Numerical Modeling of Rockfalls Using High Resolution DTM

顧承宇(Cheng-Yu Ku)

《中華水土保持學報》 44卷1期 (2013/03) Pp. 1-10

https://doi.org/10.29417/JCSWC.201303_44(1).0001

摘要

台灣之自然環境特性多為地形陡峻、地質破碎、節理發達，再加上民國88年間之921大地震後與民國99年之88水災後，使得岩坡表面之開裂節理鬆動，在颱風、地震或豪雨過後常發生落石災害。本研究利用集塊質量法發展可直接應用於工程規劃設計之整合性三維落石分析技術，同時本研究之落石分析可結合高精度測量資料或是地表雷射測距儀技術所製作之高精度數值地形模型資料，針對落石問題提供完整之評估技術以供落石災害分析評估與落石地質敏感區劃設之應用。

關鍵字

落石 ； 集塊質量法 ； 回彈係數 ； 三維分析 ； 數值高程模型

並列摘要

Taiwan is an active mountain belt created by the oblique collision between the northern Luzon Arc and Asian continental margin. These inherent geological complexities naturally created numerous rock mass discontinuities in this area, which exist in many forms such as fissures, cleavages, beddings, joints, and even faults. In past decades, rockfall hazards triggered by earthquake activity and heavy rainfall have frequently occurred in Taiwan, especially after the 921 earthquake in 1999 and Typhoon Morakat in 2009. Considerable rockfall hazards have increased dramatically and become a major obstacle for engineers. This study develops a 3-D numerical rockfall model based on the lumped mass method which treats the falling block as a point mass and allows mass free fall, impact and rolling motions in a 3-D framework. It is hoped that the 3-D rockfall analysis program can be useful for analyzing regional scale rockfall problems as well as for delineating areas of rockfall susceptibility.

並列關鍵字

Rockfall ； lumped mass method ； coefficient of restitution ； 3-D analysis ； DTM