基于声发射试验的TBM隧道施工围岩损伤及应用研究

Study on Damage and Application of Surrounding Rock in Tunnel Construction by TBM Based on Acoustic Emission Test

高黎贡山隧道作为大瑞铁路关键性控制工程,沿线地质极其复杂,各种地质灾害大大降低了TBM施工效率,为掌握TBM掘进前后隧道周边围岩的损伤演化规律,以提出合理的手段和方法处理TBM施工中遇到的地质灾害,通过提取TBM施工现场声发射试验数据,分析基于掌子面周围围岩的损伤演化规律,提出围岩松动区、损伤区和扰动区划分依据,为获取超前钻孔打设区域、支护锚杆打设深度及高地应力区TBM合理的掘进参数提供科学依据。

As a key control project of Dali-Ruili Railway,Gaoligongshan Tunnel has extremely complex geology along the line,and various geological disasters greatly reduce the construction efficiency of TBM.In order to grasp the law of damage evolution of surrounding rock around the tunnel before and after TBM excavation,and to propose reasonable methods which reduce geological disasters in TBM construction.By extracting the acoustic emission experimental data of the TBM construction site,the damage evolution law of the surrounding rock around the tunnel face is analyzed,and the basis for the classification of the surrounding rock loose zone,damage zone and disturbance zone is provided.It provides a scientific basis for the firing area of the advance drilling,the firing depth of the supporting bolt,and the reasonable tunneling parameters of the TBM in the high ground stress area.