大跨度悬索桥隧道式锚碇力学特性研究综述

Review of mechanic characteristics of tunnel-type anchorage of long-span suspension bridge

针对隧道式锚碇的力学特性,将国内外对夹持效应、破坏机制和稳定性、承载能力、地震作用下的动力响应4个方面的研究成果进行了综述。隧道锚(TTA)在夹持效应作用下可以抵抗主缆传来的巨大拉拔力;在夹持效应基础上可以推导出其承载能力计算公式,而围岩力学参数、锚塞体的楔形角、埋深等因素会对其承载力有不同程度的影响;隧道锚的破坏是自锚塞体底部与围岩的胶结面起,呈喇叭状向上发展;在地震作用下,隧道锚的前锚面的变形大于后锚面。结合已有的研究内容,对隧道锚力学特性未来的研究方向进行了展望。

In view of the mechanic characteristics of tunnel-type anchorage(TTA),the research results on the clamping effect,the failure mechanism and stability,the bearing capacity and the dynamic response under seismic action are summarized.TTA can resist the huge pulling force from the main cable under the clamping effect.Based on the clamping effect,the formula of its bearing capacity can be deduced,and the mechanical parameters of surrounding rock,the wedge angle and buried depth of the plug body and other factors will have different degrees of influence on its bearing capacity.The failure of TTA starts from the cementation surface between the bottom of the plug body and surrounding rock,and develops upward in horn shape.Under earthquake,the deformation of the front anchor surface is larger than that of the rear anchor surface.Combined with the existing research contents,the future research directions of TTA mechanical properties are prospected.