软弱破碎段炭质板岩公路隧道开挖与变形控制

Excavation and Deformation Control of Carbonaceous Slate Highway Tunnel in Weak Crushing Section

炭质板岩为薄至中厚层状岩石、节理裂隙发育且破碎、饱和强度低的软岩,遇水泥化严重,开挖后极易产生较大的变形且持续时间长,当公路隧道穿越软弱破碎炭质板岩地段时极易产生变形侵限、塌方、冒顶、关门等风险和病害,经过长期的工程实践,总结出一套在公路隧道针对此类型地层的工法及变形控制方法。

Carbonaceous slate is a kind of soft rock with thin to medium thickness layered rock with developed fractures and low saturated strength,and argillization of the rock is strong with water contact.It is easy to produce large deformation and long duration after excavation.When the highway tunnel passes through the weak and broken carbonaceous slate section,it is easy to produce deformation,landslides,roof collapse,and other risks and diseases.After a long period of engineering practice,a set of construction methods and deformation control methods for this type of stratum in highway tunnel are preliminarily summarized.