复杂环境下铁路复线路堑爆破开挖安全控制技术

Safety Control Technology for Blasting Excavation of Railway Double Track Cutting in Complex Environment

紧邻既有铁路进行路堑石方爆破开挖,施工环境复杂,安全标准要求高。依托渝怀二线漾头车站站改工程,通过精细化爆破设计将爆破区域划分为6个分区,并根据每个分区与保护对象的位置关系选取不同的爆破方式和防护措施;通过控制爆破规模、最大单响起爆药量以及优化起爆网络实现逐孔起爆,有效控制爆破振动对既有铁路和周边居民的影响;通过改变临空面方向和采用多元立体化防护措施,有效控制爆破飞石侵线和对周边居民的影响。采取本文中的爆破控制技术措施既有效控制了爆破有害效应,又保证了施工质量和进度。

The rock blasting excavation of cutting adjacent to the existing railway was carried out,which has complex construction environment and high safety standards.Based on the station reconstruction project of Yangtou station of Chongqing-Huaihua second line,the blasting area was divided into six zones by fine blasting design,and different blasting methods and protective measures were selected according to the position relationship between each zone and the protected object.By controlling the blasting scale,the maximum single blasting charge and optimizing the blasting network,the hole by hole blasting was realized and the impact of blasting vibration on the existing railway and surrounding residents was effectively controlled,by changing the direction of the free face and adopting multivariate solidification protection measures,the invasion line of blasting flying rock and the impact on the surrounding residents can be effectively controlled.The blasting control measures in this paper can not only effectively control the harmful effects of blasting,but also ensure the construction quality and progress.