Study of Excavation Method of Super Large Section Tunnel in Jointed Rock Mass
To study the influence of different excavation methods on the stability of super large cross-section tunnel in complex jointed rock mass,taking Daluoshan tunnel as the engineering background,the discrete element numerical analysis method was adopted to simulate and compare four excavation methods,i.e.the double side heading method,CRD method,CD method and three-step method,in terms of shear displace-ment of joint surface,displacement of key points of tunnel,displacement of ground surface,displacement of rock mass and internal force of support structure.The results show that the double wall heading method has the best effect in controlling the displacement changes of jointed and fractured rock mass and the inter-nal force of tunnel support structure,followed by CRD method and CD method.The three-step method is not recommended as the excavation method of large section highway tunnel in jointed strata.
highway tunneljointed rock massexcavation methoddiscrete element method
万方数据
维普
