Treatment and Analysis of Landslide and Lining Cracking Induced by Tunnel Excavation
The survey and design of tunnels in mountainous areas usually avoid tunnels crossing large landslides,but the portal section of mountain tunnel inevitably crosses the slope.During tunnel construction,deformation and slid-ing of ancient landslide and slope often occur by tunnel excavation,which cause collapse and lining cracking.Taken Hanshankou tunnel as a project case,the mechanism of slope sliding and lining cracking induced by tunnel con-struction is discussed and the effectiveness of reinforcement measures is evaluated.According to the distribution characteristics of lining cracks and the variation law of width with time,combined with the deformation characteris-tics of the whole lining,two types of lining cracking mechanisms are summarized.The first type is the tension crack in the lining,which corresponds to the formation mechanism of the cracks in the deep buried side arch foot of the tunnel.This kind of crack is in an open state with general larger width.And the width changes obviously with time;The second type is the compression crack in the lining,which corresponds to the formation mechanism of the shal-low side arch shoulder crack of the tunnel.This kind of crack is generally in a closed state with smaller width and smaller change of width with time.
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