Abstract Based on the construction practice of a soft rock tunnel on Dalin railway, a modified three-bench sevenstep construction method which uses glass fiber anchor bolts to reinforce working face is proposed, an overall process of rapid construction of tunnels in soft rock is given, the key points of process management are defined, and the effects of management techniques for rapid construction on tunnel construction efficiency and economic benefit are analyzed. The research shows that safe and rapid construction of the soft rock tunnel can be realized by optimizing arrangement of blast holes and initiation sequence, overlapping of working procedures and parallel working of different benches; compared with the conventional construction technique, the construction time of two procedures of mucking and steel arch setting, construction time of anchoring and shotcreting and total cycle construction time can be saved by 53%, 17% and 28% respectively, thus the construction efficiency is significantly improved in condition of safe and rapid construction. Further the total cost saving in terms of labour, mechanical equipment and management is ￥16.358 million, greatly improving the economic benefit of tunnel construction in soft rock.
Abstract：
Based on the construction practice of a soft rock tunnel on Dalin railway, a modified three-bench sevenstep construction method which uses glass fiber anchor bolts to reinforce working face is proposed, an overall process of rapid construction of tunnels in soft rock is given, the key points of process management are defined, and the effects of management techniques for rapid construction on tunnel construction efficiency and economic benefit are analyzed. The research shows that safe and rapid construction of the soft rock tunnel can be realized by optimizing arrangement of blast holes and initiation sequence, overlapping of working procedures and parallel working of different benches; compared with the conventional construction technique, the construction time of two procedures of mucking and steel arch setting, construction time of anchoring and shotcreting and total cycle construction time can be saved by 53%, 17% and 28% respectively, thus the construction efficiency is significantly improved in condition of safe and rapid construction. Further the total cost saving in terms of labour, mechanical equipment and management is ￥16.358 million, greatly improving the economic benefit of tunnel construction in soft rock.
HE Yingnan
.Technical and Economic Analysis on the Safe and Rapid Construction Method for Soft Rock Tunnels[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(4): 185-193
2020, Vol. 57 