Study On The Cause And Treatment Measures Of The Sediment Of Xiaotouling Tunnel

With the increase of the construction scale of Guangxi expressway,more and more tunnels will pass through karst geology,which is very easy to encounter weak and broken surrounding rock.The geological disaster caused by this is increasingly prominent,which has a great impact on the construction safety,progress and economic benefits of the tunnel engineering.The tunnel collapse caused by the weak and broken rock mass is one of the common typical engineering accidents.How to avoid such disasters in tunnel construction has become an important technical problem to be solved.This paper discusses the influencing factors of tunnel collapse,the stability analysis of surrounding rock and the treatment measures.Combined with the specific case of xiaotouling tunnel collapse,the causes of tunnel collapse and the treatment measures are studied.The work is as follows:(1)the influencing factors of tunnel collapse and the stability of surrounding rock are discussed,and the causes of tunnel collapse in soft and broken surrounding rock are analyzed.(2)taking xiaotouling tunnel collapse as an example,combined with the specific geological conditions of the tunnel,through the induction and analysis of the monitoring data,the abnormal deformation characteristics of the surrounding rock before the tunnel collapse are studied,and the collapse process is described and analyzed.(3)using FLAC3 D software to carry out numerical simulation calculation of tunnel collapse,study and analyze the key factors that lead to tunnel collapse,and at the same time,analyze from two aspects of natural factors and human subjective factors,comprehensively summarize the main causes of tunnel collapse.(4)according to the causes and characteristics of landslides,the corresponding treatment methods are put forward,and through the analysis of monitoring data,the effect of treatment of landslides is evaluated.