DEFORMATION MECHANISM AND MITIGATION MEASURES FOR EXPANSIVE ROCK IN THE DENGLOU MOUNTAIN TUNNEL
Expansive rock is a special geological condition in engineering that can easily lead to deformation and damage of tunnel structures when crossing expansive rock layers.Studying the deformation and failure mechanisms of tunnels in expansive rock is of significant practical importance.Based on the Denglou Mountain Tunnel of the Mi-yu Expressway,this research conducts an in-depth analysis of the deformation causes of expansive rock through lab-oratory experiments and integrates geological,hydrogeological,and construction process factors.Using the load-structure method,the safety of tunnel structures under various conditions is quantitatively evaluated.Based on these findings,the study proposes comprehensive mitigation measures,including optimizing tunnel cross-sections,dynamically adjusting support parameters,and groundwater control,which can provide valuable references for the design and construction of tunnels in expansive rock.
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