路堑爆破开挖对既有铁路路基振动影响研究

Vibration Influence of Road Cutting Blasting Excavation on Existing Railway Subgrade

延安—延川高速公路连接线路基扩堑爆破近接既有包西铁路路基工程,最近处距离既有包西铁路路基仅8 m。利用数值模拟及经验公式对爆破振动速度进行计算,研究爆破振动对近接既有线路基的影响。研究表明:(1)利用三维动力数值计算得到路堑开挖爆破施工对既有铁路路基的质点峰值振动速度最大为1 mm/s;(2)根据萨道夫斯基经验公式计算得到路堑开挖爆破施工对既有铁路路基的质点峰值振动速度最大为2.8 mm/s;(3)根据经验公式与数值计算得到的质点峰值振动速度均小于规程要求的10 cm/s,可以保证既有铁路路基安全。

Based on Yanyan Expressway connecting line foundation expansion closed to adjacent Baoxi railway foundation project,using numerical simulation analysis and empirical formula calculation,blasting-induced peak particle velocity is obtained to analyze the impact of blasting on the adjacent existing line foundation and the following conclusions were obtained:(1)The three-dimensional dynamic numerical calculation was used to obtain the maximum peak particle velocity of the excavation and blasting construction of the cutting on the existing railway subgrade is 1 mm/s;(2)according to the empirical formula,the peak particle velocity of the excavation blasting construction on the existing railway subgrade is up to 2.8 mm/s;(3)According to the empirical formula and numerical calculation,the peak particle velocity is less than 10 cm/s required by the regulations,and the existing railway subgrade is safe.The method of combining numerical calculation and empirical formula used in this paper can provide a reference for blasting construction of similar projects.