孙毅, 张顶立. 隧道复杂支护结构体系的协同作用原理[J]. 工程力学, 2016, 33(12): 52-62. DOI: 10.6052/j.issn.1000-4750.2016.05.ST04
引用本文: 孙毅, 张顶立. 隧道复杂支护结构体系的协同作用原理[J]. 工程力学, 2016, 33(12): 52-62. DOI: 10.6052/j.issn.1000-4750.2016.05.ST04
SUN Yi, ZHANG Ding-li. SYNERGY PRINCIPLE OF COMPLEX SUPPORTING STRUCTURAL SYSTEMS IN TUNNELS[J]. Engineering Mechanics, 2016, 33(12): 52-62. DOI: 10.6052/j.issn.1000-4750.2016.05.ST04
Citation: SUN Yi, ZHANG Ding-li. SYNERGY PRINCIPLE OF COMPLEX SUPPORTING STRUCTURAL SYSTEMS IN TUNNELS[J]. Engineering Mechanics, 2016, 33(12): 52-62. DOI: 10.6052/j.issn.1000-4750.2016.05.ST04

隧道复杂支护结构体系的协同作用原理

SYNERGY PRINCIPLE OF COMPLEX SUPPORTING STRUCTURAL SYSTEMS IN TUNNELS

  • 摘要: 隧道支护结构体系极其复杂,通常是由围岩和多个施作顺序及空间分布形式各异的支护结构组成,为分析复杂支护结构的协同作用关系,建立了包括初步加固圈、初期支护圈和二衬储备圈的复合支护圆环模型,并通过求解同心复合圆环问题,给出了模型任意圈层的内力和变形关系表达式;依据围岩变形特点划分为3个阶段,分别为超前变形阶段、急剧变形阶段和缓慢变形阶段,在此基础上明确了各阶段支护作用的重点;给出了复合支护体系在不同刚度、不同强度以及不同施作时机条件下的支护特征曲线;建立了超前支护内部协同承载模型,分析认为“超前支护壳体”与“掌子面前方岩土体”在支护刚度上的相互增益提高了超前支护整体的稳定性。通过研究核心岩土体与后续支护圈层的空间位置替换关系,从刚度需求角度揭示了围岩有必要提高自身的强度或发生一定的变形才有可能再次达到平衡状态的原因。

     

    Abstract: A composite supporting system consists of multiple supporting structures with different construction sequences of time and space. To clarify the internal coordination of the composite supporting structure, a circle model of the composite supporting system consisting of preliminary reinforcement, initial supports, secondary lining ring retainers is established. On the basis, by solving the problem of concentric composite rings, the internal force and deformation expression of the arbitrary circle model are given. The deformation evolvement of the surrounding rock is divided into three stages, namely advanced deformation stage, sharp deformation stage and slow deformation stage. Based on this, the key point of each stage is defined. The characteristic curves of the composite support system with different supporting strength, supporting stiffness and supporting time are qualitatively given. The internal coordination bearing model is established. It is concluded that the mutual enhancement in supporting stiffness of the "advanced supporting shell" and "rock mass in front of the tunnel face" can improve the overall stability of the advanced support. By studying the replacement relationship in space positions of the core of rock mass and the follow-up support retainer layer, from the viewpoint of the rigidity demand, it is revealed that it is necessary to improve the bearing capacity of surrounding rock, or there will be a certain deformation to make it possible to reach the new equilibrium state again.

     

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