摘要
开挖爆破是山区常用的一种施工方法,爆破开挖常常会对周围的土石坝造成影响,因此有必要研究爆破震动波对既有土石坝的影响。本文结合工程实例,建立某高土石坝有限元模型,输入相似工程的爆破波进行分析,以探讨爆破震动对该高土石坝的影响,结果显示:位移从上至下呈依次减小趋势,位移最大值主要集中在坝顶;应力分布主要集中在主堆石区;速度时程曲线和加速度时程曲线从上至下逐渐减小,坝顶波动最为激烈且最大值对坝体安全性产生了威胁;本次模拟采用炸药用药量对该土石坝的安全性造成了威胁,建议减小用药量或增加爆破距离。
The excavation blasting is a commonly used method in practical engineering of mountainous re- gion, blasting excavation usually causes serious harm to earth - rock dam, so it is necessary to study the effect of blasting vibration wave on the dam. To identify the security of a earth - rock dam, this article selects a similar project blasting vibration wave to carry on the numerical simulation of dam, the result shows that displacement from top to bottom in turn decrease trend, and the max displacement is mainly concentrated in the position of dam crest, the stress distribution is mainly concentrated in the main rockfill area, the acceleration time history curve and velocity time history curve decline gradually from up to down, the fluctuation of the dam crest is the most intensive and the maximum pose a threat to the security of the dam, the simulation uses explosive dose on the dam is harmful and less weight of explosive or longer distances is advised.
出处
《佳木斯大学学报（自然科学版）》
CAS
2017年第3期424-426,434,共4页
Journal of Jiamusi University：Natural Science Edition
关键词
爆破
土石坝
震动波
动力响应
破坏
blasting
earth - rock dam
shock waves
the dynamic response
damage
