【摘要】 研究了考虑围岩松动圈的位移反分析在卵砾石层隧道工程中的应用。由于江苏省常宁高速公路茅山隧道大部分处于卵砾石地层中,围岩稳定性差,隧道埋深浅,必须采用隧道信息化施工。为了确保隧道施工的安全进行,将隧道简化为平面应变问题,实现了位移反分析计算,采用考虑围岩松动圈的双介质模型,反演松动圈的弹性模量。然后利用有限元法,对隧道动态施工过程进行了仿真数值模拟研究,并将计算分析结果反馈设计和施工,进而调整设计,指导施工,确保了工程的安全施工。更多还原

【Abstract】 This paper presents the application of displacement back analysis for the tunnel engineering in gravel-cobble stratum taking the loosing zone into consideration.Because the Maoshan tunnel is mostly located in gravel-cobble stratum,the information construction has to be conducted in the tunnel construction in Changning highway,Jiangsu Province.This tunnel has a shallow embedment and the stability of the adjoining rock is under bad conditions.In order to ensure the security of the tunnel construction,the back analysis of displacement is carried out.The three-dimensional model of the tunnel excavation is simplified into the plane strain problem.Taking into account the loosing zone of adjoining rock,the two-medium model is adopted in the computation.The elastic modulus of the loosing zone is used to process the normal analysis in the supervision of the tunnel construction.Then,the dynamic simulation of the construction process has been conducted by finite element method.Thus,the feedback design has been realized and the construction safety has been under control.更多还原