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为了减少岩溶地区扩建公路路堑爆破对行车的干扰,确保公路在扩建期间具备安全行车的条件。本文以柳州至南宁高速公路改扩建项目为依托,通过对路线所经区域岩溶特征的调查及其对爆破影响的分析,开展了扩建公路路堑爆破技术研究,并提出了边施工边通车条件下扩建公路路堑爆破+防护+交通组织的系统实施方案。研究结果表明,应根据工程特点分段采用多循环、中深孔、浅眼松动和隔墙拉槽等控制爆破为主的爆破扩堑方案,同时辅以弹性与刚性相结合的爆破点、边坡平台及老路路面三级临时防护体系,临时封闭交通时间宜控制在15~30min。
In order to reduce the interference of highway blasting on the highway in karst areas and to ensure that the highway has the safe driving conditions during the expansion period. Based on the reconstruction of Liuzhou-Nanning expressway project, this paper studies on the highway blasting technology of Expansion Highway through the investigation of the karst characteristics of the route area and its impact on the blasting. Highway blasting + protection + traffic organization system implementation plan. The results show that the blasting and broadening plan based on controlled blasting, such as multi-circulation, middle-deep hole, loose-loosening of the eyes and slotted trough, should be adopted in stages according to the engineering characteristics. At the same time, with the combination of elastic and rigid blasting points, Slope platform and the old road surface three temporary protection system, temporary closed traffic time should be controlled at 15 ~ 30min.