Construction Technology for Large Deformation Control of Carbonaceous Slate Tunnels
In tunnel construction,large deformation of soft rock is a common geological disaster.The occurrence of such disasters often leads to the destruction of the tunnel structure,which in turn affects the normal use of the tunnel.The problem of large deformation of soft rock is usually caused by the lack of strength and stability of soft rock[1].After the tunnel is excavated,it is revealed that the surrounding rock is a steeply inclined ex-tremely thin-bedded slate,phyllite,carbonaceous slate and other undesirable strata,the rock mass is extremely broken,the rock compressive strength is low,the deformation often lasts for a long time,and the support meas-ures are not in place,which is very prone to erosion[2].In view of the sections of the railway tunnels where first and second level soft rock large deformations have occurred one after another,in order to further improve the timeliness and effectiveness of the response and disposal of large deformation of soft rock and ensure the safety of tunnel construction,this paper summarizes the classification and identification standards and deforma-tion control measures of large deformation of soft rock in tunnels,so as to guide on-site construction and pre-vent the occurrence of serious tunnel deformation and even encroachment.
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