隧道无轨运输独头掘进超9600m施工通风技术

Ventilation Technology for the Construction of over 9600m Length Blind Heading with Trackless Transportation

锦屏电站辅助洞为A、B线的上下行单线隧道,线间距35 m,单线长17.5 km,由于隧道埋深大且无任何条件修建斜竖井做到长隧短打,只能从近东西向相向掘进,同时又由于工程的西端场地极其狭窄,不能满足有轨运输施工条件。通过技术论证,大胆创新,引入公路运营通风的理念,将射流通风运用于本工程的施工通风,从理论研究结合现场通风测试验证,成功地解决了巷道式射流风机选型、布置及通风管理等关键技术。通过双孔独头掘进9600 m的施工通风效果检测表明,洞内空气质量的各项指标均达到国家环卫标准,实现内燃作业、无轨运输,取得了良好的经济效益和社会效益。

Jinping auxiliary twin tunnel consists with two lines, one （Line A） is parallel to the other （Line B） with a separation of 35m from center to center, and the length of single line is 17.5 kin. Due to the complex geological environment, there is no suitable condition to build any shaft （vertical or oblique shafts） in between, and the tunnel has to be constructed with bi-direetional drilling （ eastern and western side）. At the meanwhile, as construction field of the western side is insufficient to the requirement for rail transportation, jet ventilation technology-applied in highway tunnel operation was introduced for trackless transportation to solve ventilation problem, and air quality indexes was up to the national sanitation standard.