波纹板隧道支护结构分析方法与承载特征

Study on Bearing Capacity of Initial Supporting Structure of Corrugated Plate in Tunnel

波纹板结构相比钢筋混凝土结构其力学、耐久性能更好,且施工工期更短。将其应用于隧道支护领域具有重要的理论意义和工程价值。本文通过有限元数值模拟,建立梁、壳两种单元组合成的波纹板结构模型,并对不同荷载模式下的承载力进行了计算。研究表明:梁、壳单元模型应力、位移相差不大;波纹板结构在以竖向荷载为主导时,隧道拱顶位置受力及沉降最大;而在水平荷载主导下隧道边墙位置受力、外扩最大。其中梁、壳单元模拟的波纹板结构整体几乎均受压,且结构波峰主要承担外侧围岩荷载,波谷主要承担结构变形挤压所产生的力;波纹板结构在集中力荷载作用下,作用于拱顶时结构应力、位移较小,作用于拱腰时结构位移较大,作用于拱脚时结构应力较大。该波纹板支护结构的应用可以为隧道支护领域提供更多的选择,具有良好的工程应用前景。

As a new type of structure,corrugated structure has better mechanical properties and durability than reinforced concrete structure,and its construction period is shorter. It has important theoretical significance and engineering value to apply corrugated plate in tunnel support field. In this paper,the bearing capacity of the corrugated structure composed of beam and shell elements was calculated by finite element numerical simulation. The results show that the stress and displacement of beam and shell elements show little difference in this simulation.Under the predominately vertical load,the stress and settlement of the tunnel vault are the largest,while the stress and expansion of the tunnel side wall position are the largest under the predominately horizontal load. The whole structure simulated by shell elements and beam elements is almost under pressure. And the structural wave crest mainly bears the external surrounding rock load, while the trough mainly bears the force caused by structural deformation and extrusion. Under the concentrated load,the structure’s stress and displacement are small when load acts on the vault,the structural displacement is larger when it acts on the arch waist,and the structural stress is larger when it acts on the arch foot. The application of the corrugated support structure can provide more choices for tunnel support,and has good prospects in the field of engineering.