砾砂风化岩场地内爆破施工对铁路路基的影响分析

摘要

为分析惠州一新建河道爆破施工对既有惠大铁路(惠州—大亚湾)路基的影响,运用FLAC软件建立了二维爆破工程有限元计算模型.将爆破冲击力等效成单脉冲荷载输入模型,考虑了阻尼边界等计算条件.通过模拟计算分析在砾砂风化岩场地内爆破药量、爆破距离对铁路路基振动的影响.结果表明:原有爆破方案不能满足路基振动安全控制要求.建议加大爆破距离或减小单孔爆破药量.%To study the influence of a new river channel blast construction on Huizhou-Dayawan railway subgrade. A 2D blast engineering f inite element modeling was established using FLAC software.The blast impact load was equivalent to a single pulse load then was input into the modeling.The simulation condition of damping boundary was considered.By numerical simulation,the influence of blast charge and blast distance on the vibration of railway subgrade was studied in weathered gravel rock site.The results show that the original blast scheme cannot meet the control requirements of subgrade vibration.It was suggested that blast distance should be increased or single hole blast charge should be decreased.