浅谈不良地质条件下小断面、长竖井开挖支护施工技术

Excavation and Support for Long Shaft with Small Section under Poor Geological Conditions

通过四川松林河洪一水电站竖井扩挖施工的工程实例,介绍了小断面(开挖断面直径4 m)、长竖井(225.8 m)在岩石破碎、裂隙发育等诸多不利条件下,利用LM200型反井钻机施工导井,正扩挖法扩挖的施工方法和取得的成果。

Case study for shaft excavation construction is conducted for Hongyi hydropower station on Songlin River in Sichuan province in this paper.Construction methods and achievements are presented for long shaft(225.8 m) with small section(diameter 4 m) under many unfavorable conditions,such as fractured rocks and developed joints,excavating pilot tunnel by LM200 raise-boring machine and then enlarging the tunnel from top to bottom.