Analysis on the Causes of Cracks in the Inverted Arch of Loess Tunnels and Reinforcement Measures
Aiming at the cause analysis and reinforcement of longitudinal cracks in invert filling layer of a loess tunnel under construction in an highway,the on-site investigation of cracks,combined with the water content and bearing capacity of inverted arch basement during construction,the surrounding rock condition of inverted arch basement,on-site crack detection,core-taking detection and geological reconnaissance investigation,indicates that the foundation of the invert tunnel is softening,the decrease of load capacity is the main cause of fracture in loess tunnel.A comprehensive treatment scheme of"steel pipe pile arch foot reinforcement+inverted arch base adding seepage blind ditch"is put forward,which provides references for similar tunnel diseases.
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