增二线车站扩堑石方控制爆破

EXPANSION OF ROCK CUT BY CONTROLLED BLASTING IN RECONSTRUCTION PROJECT OF RAILWAY STATION

在菏日复线莒南站扩建工程中 ,既有线路两侧石质路堑的开挖采用了低台阶浅孔控制爆破技术。利用列车行车间隙进行爆破作业。预裂爆破和梯形微差起爆方法用于控制爆破地震效应 ;边坡侧安设钢管排架或预留岩石隔墙以及爆区覆盖“炮被” ,用来防止飞石抛向既有线 ,这些技术和安全措施确保了列车的正常运营 ,保证了民宅和周围环境的安全。文中详细介绍了爆破参数设计、炮孔布置。

In reconstruction project of Lunan station,low bench and short hole controlled blasting technology was utilized for excavation of rock cuts on two sides of the existing line The blasting operation was carried out at the time of no train The presplitting blasting and the trapezoidal firing sequence were used to control the seismic effect led by blasting The steel pipe bent or rock partition,installed or pre remained on the side of the slope,and the 'blasting cover'on blast holes were used to prevent flying rocks to the existing line All of technological measures and safety precautions ensure normal train running,the safety of civilian houses and their surroundings In this paper,the design of blasting parameters,blast hole pattern,firing circuit and constructing experience were introduced in detail