某铁路工程边坡爆破开挖动力响应有限元分析

边坡爆破开挖的动力响应分析是一个极其复杂的问题,其常用的反应谱理论经多年实践,已经暴露了许多不足之处。随着科学技术的发展,迫切需要一种完善可行的、克服上述不足的方法来解决这一问题。本文以时程分析法对某铁路工程高陡边坡爆破开挖进行震动动力响应分析,详细介绍了某铁路工程高陡边坡计算模型的概化方法及建立方式等。结果表明,利用功能强大的数值模拟软件对爆破进行模拟分析是有效可行的。尽管此次爆破的震动速度最大值超标,各种应力在坡脚底部存在应力集中现象,但各应力值都较小。

FINITE-ELEMENT ANALYSIS OF DYNAMIC RESPONSE TO EXCAVATION OF ONE RAILWAY SIDE SLOPE BY BLASTING

The analysis of dynamic response to excavation of side slope by blasting is a complicated issue, the common response spectrum theory for it reveals lots of shortcomings through practice for many years. With development of science and tchnology, it is necessary to have an improved and feasible way to overcome the shortcomings. The analysis of vibration dynamic response is made by temporal analysis method to excavation of one side slope with high grade by blasting and an introduction in details is given to the generalization method and establishment way for calculation model to side slope in this paper. The result shows it is feasible to make simulation calculation for basting by adopting numerical simulation software with powerful function. Although the max. vibration speed of this blasting exceeds the standard and all kinds of stresses are centred at bottom of slope foot, but the values of all stresses are small.