Abstract：Research purposes :During construction of large section loess tunnels of high-speed railway，the problems of cracking and deformation of the tunnel or slope are often encountered and they will bring about the potential safety hazard to tunnel construction and operation if they are not timely disposed. So it is of great significance to research and control the cracking and deformation of the large section loess tunnels. Based on the cracking and deformation monitoring, research and treatment effect of the Liangyi Tunnel，the systematic and comprehensive measures to deal with such problems are presented.
Research conclusions:(1)The cracking and deformation easily happen on the surface above the tunnel roof and tunnel body of the shallow bias section and large section loess tunnel. Based on the dynamic monitoring，the analysis of the causes for the cracking and deformation and their dangers is made to take the reasonable treatment measures timely and reduce the risk to a minimum level in the tunnel construction and operation. ( 2)The soil loose，the increase of the soil water content and saturation when meeting water, the shallow and bias and the mechanical vibrations are the main cause for cracking and deformation of the Liangyi Tunnel.(3)Taking measures of the clear load reduction，pile reinforcement and slope back pressure can effectively control the cracking and deformation，and it can provide the reference to research and treatment of the deformation of large section loess tunnel of high-speed railway
李景山. 大西客运专线两宜隧道开裂变形的监测与治理[J]. 铁道工程学报, 2013, 30(10): 81-86.
LI Jing-shan. Monitoring and Control of Cracking and Deformation of Liangyi Tunnel of Datong-Xi an Passenger Dedicated Line. Journal of Railway Engineering Society, 2013, 30(10): 81-86.
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2013, Vol. 30 
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