小净距隧道群控制爆破技术

摘要

The methods of small excavation in the middle at YYK393+581-YYK393+621 and enlargement at YYK393+581-YYK393+621 with a surrounding rock of class III are presented after analyzing the general survey, topography, construction difficulties, and numerical study of the Dapingshan Tunnel. In addition, the relevant key points of blasting technique and parameters are studied. Finally, some suggestions concerning construction safety are discussed.%文章通过对大坪山隧道的工程概况、地形地质特点及工程施工难点的分析,并借助数值研究手段,有针对性地提出了YYK393+581～YYK393+621洞段中导洞超前、大断面循序跟进的施工方法；研究分析了炸药性能及尺寸等控制爆破技术要点及爆破参数,同时就施工安全措施提出了一些建议.