The development roadways are laid out in -520 m and -580 m level,with the level height of 60 m and the sublevel height of 20 m.
通过对这几种开拓方案进行经济技术综合比较分析,最终确定为自下而上的上行式阶段回采顺序,开拓方案选择在-520m和-580m中段布置阶段开拓巷道,阶段高度为60m,分段高度为20m。
Based on the theory of the wall-rock, this paper analyzes on several important parameters of the excavation of the road tunnel, which include the excavation height, excavation width and cyclical footage, sums up the rational cyclical footage and the excavation flatness ratio, and expounds the rational selection of the excavation methods and the excavation cyclical footage.
根据围岩压力理论分析了公路隧道开挖的几个重要参数,包括开挖高度、开挖宽度及循环进尺。
Combined engineering practice,based on the investigation in the excavation and construction about the instability phenomenon of the layered rock high slope along Wanzhou-Liangping expressway,the theoretic formula for calculating the excavation height and instability length of layered rocky slope have been deduced.
结合工程实际,以万梁高速公路沿线顺层岩石高边坡开挖施工中出现的边坡失稳现象调查为基础,推导了顺层岩石边坡开挖高度与失稳长度的理论计算公式,并针对现场实际存在的复杂几何外形的边坡情况,给出了相应的修正计算方法。
