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基于统一强度理论和非关联线性流动法则,考虑塑性区的真实弹性应变,推导了深埋圆形隧道弹塑性位移统一解。位移统一解合理地考虑了中间主应力效应和围岩剪胀特性的影响,具有广泛的理论意义。经与文献简化位移解析解比较分析知,围岩塑性区的弹性应变对隧道位移影响显著,简化解析解所得结果偏小,简化解析解和文中统一解之间的差异与中间主应力效应和围岩剪胀特性密切相关;考虑中间主应力的影响,能更加充分发挥围岩的强度潜能;隧道支护设计应考虑围岩剪胀特性的重要影响。
Based on the unified strength theory and the non-associated linear flow rule, the unified elastic-plastic displacement of a deep buried circular tunnel is deduced considering the true elastic deformation of the plastic zone. The unified solution of displacements reasonably considers the influence of the intermediate principal stress effect and the dilatancy characteristics of the surrounding rock and has broad theoretical significance. Comparing with literature simplified displacement analysis solution, the elastic strain of plastic zone of surrounding rock has a significant influence on tunnel displacement. The result of simplified analytical solution is small, and the difference between simplified analytical solution and unified solution and intermediate principal stress effect Rock dilatancy characteristics are closely related; taking into account the influence of intermediate principal stress, the strength potential of surrounding rock can be fully exerted; and the design of tunnel support should consider the important influence of dilatancy characteristics of surrounding rock.