基于D-P准则有压圆形衬砌隧洞弹塑性解

D-P Yield Criterion Based Elastoplastic Solution of the Circular Pressure Tunnel

随着大型水利工程的建设,出现了大量的深埋水工压力隧洞。由于深埋有压隧洞在施工和运营不同工况条件下,隧道衬砌和围岩主应力会发生变化。文章基于D-P屈服准则,在平面应变条件下推导了深埋有压衬砌圆形隧洞第一主应力分别为径向应力和切向应力时隧洞的弹塑性解。研究结果表明:该理论模型计算值与M-C准则计算值基本吻合,验证了该模型的正确性,且较M-C准则计算结果偏于安全;在不同地应力水平与内水压力工况下,衬砌与围岩的塑性区半径发生变化;随着内水压力的增大,塑性区分布可分为5个阶段,且在高水压阶段水压力增大对衬砌屈服半径的发展较为迅速。

With the construction of large-scale water conservancy projects in China, many deep-buried hydraulic pressure tunnels have been built. The principal stress of tunnel lining and surrounding rock will be changed under different conditions of construction and operation for the deep buried pressure tunnel. Based on D-P yield criterion,the elastoplastic solution of the deep-buried circular pressure tunnel was derived when the first principal stress is the radial stress or tangential stress under the condition of plane strain. The research shows that the calculated values by this model were consistent with the calculated values by M-C criterion, which verifies the correctness of this model and it is more conservative compared with the calculated results by M-C criterion;radiuses of plastic zones of lining and surrounding rock will change in different stresses levels and internal water pressures;plastic zone distribution can be divided into five stages and the yield radius of lining develops faster with an increase of internal water pressure during high water pressure stage.