【摘要】 为了研究浅埋双侧偏压小净距隧道开挖的破坏模式及衬砌荷载分布规律,通过现场调研和数值模拟的方法对4种典型计算模型进行分析,分别获得了该类型隧道先行洞开挖和双洞开挖后隧道的破坏模式。然后针对该类型隧道的破坏特点,在基本假定的基础上建立了浅埋双侧偏压小净距围岩压力计算的力学模型,并结合公路隧道设计规范中有关成果,推导出能够考虑隧道左、右洞先后施工过程的隧道围岩压力计算理论。此外,通过数值模拟的方法对该类型隧道的围岩压力计算参数进行敏感性分析,获得了各计算参数对该类型隧道围岩压力的敏感性影响规律。更多还原

【Abstract】 To explore the failure mode of shallow-buried bilateral unsymmetrical loading twin tunnel as well as the distribution law of surrounding rock pressure,four typical types of calculation models are analyzed through the field investigation and numerical simulation.The failure modes of the foregoing hole and following holes are obtained,respectively.Then,according to the failure characteristics of this type of tunnel and the basic assumptions,the mechanical model for the surrounding rock pressure of shallow-buried bilateral unsymmetrical loading twin tunnel is established.In addition,based on the results of highway tunnel design specifications,the computational theory,which takes the successive construction of the left and right hole of the tunnel into account,is derived.Furthermore,the sensitivity analysis on calculation parameter of lining loading of shallow-buried bilateral unsymmetrical loading twin tunnel is conducted by numerical simulations.Finally,the sensitivity influencing rule is obtained.更多还原