某高速铁路路隧过渡段变形特点及机理分析
Deformation characteristics and mechanism analysis at the road tunnel junction segment of high-speed railway

摘要 针对某高速铁路路隧交界段出现的隧道衬砌开裂、轨道板横向水平错台等病害，综合地形地貌和水文地质条件，采用数值分析的方法对线路的变形特点进行分析，并将数值分析结果与现场监测结果进行对比，证明了计算结果的准确性.研究结果表明：线路变形的区域主要为明洞前端和路基段，桥梁的病害由路基挤压所致；降雨是此线路发生变形的主要诱因，降雨入渗导致全风化云母石英片岩软化，造成低山侧土体抗力不足，引起明洞及路基变形，并推挤桥台。根据分析的变形特点制定了大直径抗滑桩与树根桩相结合并加强防排水措施的抗滑方案，施工后监测的变形值不再增加.
Abstract：In view of the tunnel lining cracking and horizontal displacement of the track plate at the subgrade and tunnel junctional segment of a high-speed railway, combined with the topography and hydrogeological conditions, the numerical analysis method is used to analyze the deformation mechanism of disease occurrence, and then the results are compared with the on-site monitoring results to prove the calculation accuracy. As a result, the deformed area is mainly the open hole and the roadbed, and the deformation of the bridge is caused by the extrusion of the roadbed. Rainfall precipitation is the most important triggering factor, the gully terrain on the side of railway line is the basic condition for the oblique deformation; the water softening of the fully weathered mica quartz schist leads to the insufficient resistance of the tunnel filling on the lower side of the tunnel, which leads to the deformation of roadbed and tunnel. Finally, according to the deformation characteristics, an anti-sliding scheme combining large-diameter anti-slide piles with root piles and strengthening the anti-drainage measures is developed, and the slope failure problems have been resolved.