爆破震动对路堑边坡的数值模拟

开挖爆破是山区路堑边坡的常用施工方法，爆破开挖会对周围边坡造成严重危害，因此有必要研究爆破震动波对既有边坡的影响。市政规范规定50 m为铁路保护范围，该范围内禁止爆破施工，200 m范围内为控制性爆破范围。选取振速接近1.5 cm／s的实测爆破震动波，对工程实例场平边坡进行数值模拟。由于边坡距北侧现状渝怀铁路50 m ，在对地块进行场平开挖时，需采取控制性爆破施工，文中模拟爆破震动对该边坡的影响。结果显示：U X位移主要集中在坡面坡脚位置，UY位移从上至下呈依次减小趋势；应力分布从上至下逐渐增大，最大应力集中在坡底处；加速度时程曲线坡顶波动最为激烈，坡脚次之。本次模拟采用的炸药用药量对该边坡基本不造成危害。

Numerical Simulation of Blasting Vibration on Cut Slope

The excavation blasting is a commonly used method of construction of mountainous region cutting slope ,blasting excavation usually cause serious harm to slope ,so it is necessary to study the effect of blasting vibration wave on the slope .In municipal specification stated in the 50m for railway protection range ,within the scope of the blasting construction is forbidden ,within the scope of 200m on the scope of controlled blasting .This article selects the other similar project speed close to 1.5 cm/s of the measured blasting vibration wave ,flat project to carry on the numerical simulation of slope .Because of the north slope away from the present situation of Chongqing railway 50m ,in the plots for flat construction field , take controlling blasting construction , the author simulated the influence of blasting vibration on the slope .The result shows that :UX displacement mainly concentrated in the position of slope toe ,UY displacement from top to bottom in turn decrease trend ;stress distribution from top to bottom gradually increased ,the maximum stress concentration in the bottom ;the most intense fluctuation ,acceleration time history curve of peak slope foot times ;the simulation using explosive dose no harm on the slope .