| With the rapid development of highway construction,restricted line index,geology,environmental protection and other factors,more and more shallow buried large span tunnel with small spacing in engineering practice,the construction process due to the coupling effect of multiple factors,compared with the conventional tunnel tunnel structure and rock mechanics effect is more complex and the construction difficulty,construction risk is higher,there are many different diseases of shallow buried large span small spacing during construction,how to accurately grasp the construction mechanics effect and mechanism of deformation and failure during the tunnel construction safety key security,has high study on this kind of special practical value and significance of the tunnel.This paper is based on Linxia to cooperate Quao highway tunnel,using the finite element software to simulate each construction stage,combined with field monitoring data,analysis of the shallow bias mechanism from the net construction disaster in highway tunnel,discuss the evaluation of strengthening treatment technology and its effect.Specific work is as follows:(1)through field investigation and research field tracing test data analysis,combined with the design,construction,preliminary analysis on the cause of disaster Quao tunnel construction.(2)Quao tunnel according to the topographic and geological conditions and design parameters,by using the numerical analysis software of inversion analysis of formation mechanism of Quao produced tunnel diseases,and the numerical calculation results and field survey results of disaster analysis.(3)the tunnel disease treatment technology research,according to the causes and mechanism of Quao tunnel diseases,formulate feasible reinforcement scheme.(4)numerical simulation of the tunnel structure after reinforcement,the calculated results were compared with field monitoring data analysis,comprehensive evaluation of the reinforcement effect. |
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