既有铁路扩堑石方控制爆破施工技术

Control Technology for Blasting Stones for Expanding Road Cutting of Existing Railway

研究目的:在繁忙既有线不停运、不减运量的条件下,路基左侧扩堑爆破方量达13万方,临近既有线周围还有电力、通信、地下管路及军用电缆等重要设施,施工环境十分复杂。必须解决复杂环境条件下弱松动爆破安全问题。研究结论:本文结合黔桂铁路既有线扩堑石方控制爆破施工,根据当地环境条件和地质条件,采用相应的低梯段小直径钻孔台阶松动爆破、边坡预裂爆破和移动铺轨排架安全防护措施,并根据试验和爆破效果分析,提出了符合现场条件的爆破参数、安全管理办法及安全防护措施。在黔桂铁路既有线扩堑中高效快速地完成了爆破施工作业,且路堑边坡平整稳定,取得了良好的安全爆破效果,经济、环境效益显著。

Research purposes： The blasting stone amount is up to 130 thousand cubic meters of stone for expanding the road cutting on the left side of the subgrade of existing railway under complicated construction condition with many important facilities nearby, such as electric power lines, communication tines, underground pipeline and military communication lines. In order not to reduce the traffic capacity of the railway, the safety of weak and loss blasting should be ensured under complicated environmental condition. Research conclusions： According to the environmental and geological conditions, the low going and small boring diameter bench loose blasting, blasting for pre - crack of side slope and movable track panel were adopted for blasting stone for expanding the road cutting of Guiyang - Guilin Railway, and based on the test and analysis of the blasting effect, the suitable blasting parameters for the local condition, safety management method and protective measure for safety are put forward. With these technologies and measures, the blasting operation is completed rapidly for blasting stones for expanding the road cutting of Guiyang - Guilin Railway, obtaining the level and stable side slope of the road cutting, good blasting effect and perfect economic and environmental benefits.