京珠高速公路石门坳隧道施工初探

Investigation on Construction of Shimen'ao Tunnel in Beijing-Zhuhai Expressway

本文结合京珠高速公路石门坳隧道地处石灰岩地层的实际情况 ,探讨了如何在钻爆施工过程中运用技术与管理相结合的手段控制爆破 ,最大限度的减少超欠挖的办法 ;文章还对溶洞、溶沟、溶槽发育的某些特殊地质段提出了处理方案并得出 :溶洞对隧道的主要影响为水害 ,对岩溶水的处理宜疏不宜堵的原则 ,宜于采取截、排、堵、防的综合措施。

Based on construction practice in Shimen'ao Tunnel of Beijing-Zhuhai Expressway located in limestone strata, the blasting control method during drilling and blasting by combination of technical measures with management to minimize the excessive under-excavation was investigated. In this paper for the specific areas such as the cavern, ditch and trough of Karst formation, some countermeasures were suggested. It is pointed out that the Karst cavern influences the tunnel due to the damage by water. For the water from Karst formation the dredge method is preferable to blocking. It is better to take comprehensive measures combining damming, dredging, blocking and preventive measures. [