为研究石英片岩区隧道变形破坏机理及影响因素，本文以油坊坪隧道作为研究对象，在对隧道围岩物理力学特性及工程地质条件进行调查分析的基础上，结合隧道变形监测方案，总结归纳了石英片岩隧道的变形破坏过程。研究发现：该变质岩隧道变形破坏多发生在节理裂隙发育，含有地下水，且含有蒙脱石、伊利石、高岭土等膨胀性矿物的围岩之中，且隧道变形破坏具有滞后性、多样性、变形速率快、变形时间长等特点；隧道围岩变形量均超过其对应围岩级别的预留变形量，油坊坪隧道进出口段及拱顶部位沉降变形速率范围为10～35 mm ／d。在监测过程中，底板最终沉降最大值为130．5 mm，最小值为15．3 mm，拱顶沉降最大值为131．1 mm，最小值为27．8 mm；隧道变形破坏主要由重力驱动型、应力驱动型和应力－结构驱动型3种。%For the study of metamorphic rock tunnel deformation failure mechanism and influence factors,this paper takes oil mill ping metamorphic rock tunnel as the research object,on the surrounding rock physical and mechanical properties and engineering geological conditions on the basis of investigation and analysis,combined with the tunnel deformation monitoring,sums up the deformation and failure process of the metamorphic rock tunnel.Study found:metamorphic rock tunnel surrounding rock is mainly affected by ground stress,rock mass characteristics and groundwater three factors;Tunnel surrounding rock deformation than its corresponding reserve level of surrounding rock deformation,Oil Mill Flat tunnel section and arch parts import and export settlement rate range for 10 ~35 mm /d.In the process of monito-ring,the maximum floor final settlement is 130.5 mm,minimum value is 15.3 mm,a maximum of 131.1 mm,vault subsidence minimum value is 27.8 mm.;Tunnel deformation damage mainly driven by the gravity driven,stress and stress and structure drive type three kinds.
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