对隧洞掘进机(TBM)开挖过程围岩-支护的联合承载特性进行了数值分析.首先详细分析了在TBM掘进时,围岩和支护的相互作用过程和各种荷载的属性.然后,提出了TBM施工围岩稳定和支护受力的计算方法,主要考虑了施工作用力、开挖荷载和外水压力荷载.提出了确定TBM施工过程中围岩单独承担开挖荷载比例的计算方法.最后结合某大型供水工程,采用上述方法分析了TBM掘进段II—V类围岩稳定和支护受力特性.计算结果既符合一般规律,也提供了定量评估围岩承载能力的方法,能够充分反应不同岩性下围岩-支护系统的联合承载特性,并从数值分析角度论证了衬砌设计的合理性. The numerical analysis of the joint bearing characteristics of surrounding rock and its supporting during the excavation of tunnel boring machine (TBM) is carried out.First, the interaction process of surrounding rock and support and the properties of various loads are analyzed in detail when the TBM is heading , The calculation method of surrounding rock stability and supporting force of TBM construction is proposed, mainly considering the construction force, excavation load and external water pressure load. The calculation of determining the proportion of excavation load borne solely by surrounding rock during construction of TBM Method.According to the above method, the stability and supporting characteristics of the II-V surrounding rock in TBM heading section are analyzed with the above method.According to the general law, the method is also provided to quantitatively evaluate the bearing capacity of surrounding rock, Which can fully reflect the joint bearing capacity of surrounding rock-support system under different lithologies and demonstrate the rationality of lining design from the point of view of numerical analysis.