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综合利用复变函数理论、解析延拓法和Schwarz交替法揭示相邻水平并行隧道的应力分布特征.在此基础上,结合考虑了中间主应力效应的D-P屈服准则建立相邻水平并行隧道力学模型.提出并行隧道塑性区贯穿半径的概念,建立求解方程,并通过数值模拟证明其正确性.采用隧道间塑性区临界贯穿状态下的间距作为隧道合理间距,与数值模拟软件FLAC3D计算得到的围岩位移量和沉降量随间距变化至基本不发生变化时所对应的隧道间距有较高的吻合性,从而表明其作为相邻水平并行隧道合理间距的可行性.
Based on the theory of complex functions, analytic continuation method and Schwarz’s alternating method, the stress distribution characteristics of adjacent horizontal parallel tunnels are revealed, and based on this, the DP horizontal coupling tunnel mechanics model is established based on the DP yield criterion considering the effect of intermediate principal stress The concept of parallel penetration radius of plastic tunnel in tunnel is proposed, and the solving equation is established, and its correctness is proved by numerical simulation.The interval between critical tunnels in the plastic zone of the tunnel is adopted as the reasonable spacing of the tunnel, and the surrounding rock calculated by numerical simulation software FLAC3D The displacements and settlements have a good agreement with the change of the distance to the tunnel spacing when there is almost no change, which shows that it is feasible as a reasonable distance between adjacent horizontal parallel tunnels.