Abstract In the South Luliangshan tunnel, the surrounding rock at the entrance of the #2 inclined shaft is mainly composed of horizontally layered mudstone, marlstone, and limestone with developed bedding and joint fissures, which are inclined to result in rock falls, chipping, and rock collapse at the arch after blasting, causing difficulties in terms of rapid excavation, cost control, and safety risks. In this paper, considering the excavation method, advance reinforcement, controlled blasting, primary support, monitoring, and measurement, major construction methods, measures, and techniques are presented for the single-track railway tunnel in horizontal stratum, such as the short bench method, advance condulet grouting, slight controlled blasting, hollow grouting anchor support for the arch, geological advance prediction, and strengthened construction monitoring.
Abstract：
In the South Luliangshan tunnel, the surrounding rock at the entrance of the #2 inclined shaft is mainly composed of horizontally layered mudstone, marlstone, and limestone with developed bedding and joint fissures, which are inclined to result in rock falls, chipping, and rock collapse at the arch after blasting, causing difficulties in terms of rapid excavation, cost control, and safety risks. In this paper, considering the excavation method, advance reinforcement, controlled blasting, primary support, monitoring, and measurement, major construction methods, measures, and techniques are presented for the single-track railway tunnel in horizontal stratum, such as the short bench method, advance condulet grouting, slight controlled blasting, hollow grouting anchor support for the arch, geological advance prediction, and strengthened construction monitoring.
2014, Vol. 51 