摘要
为研究不同开挖工法对围岩中节理发育的超大断面隧道稳定性影响,以在建大罗山公路隧道为工程背景,运用离散元数值分析方法,研究了双侧壁导坑法、CRD法、CD法和三台阶法四种开挖工法下节理面剪切位移、隧道开挖轮廓位移、地表沉降、围岩位移、支护结构内力的变化规律.研究结果表明:双侧壁导坑法在控制节理裂隙岩体各位移变化及隧道支护结构内力方面效果最好,CRD法和CD法次之,不推荐将三台阶法作为节理发育地层中大断面公路隧道的开挖工法.
Abstract
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.
基金项目
浙江省交通运输厅科研计划项目(2021-GCKY-04)
维普
万方数据