西南山区铁路客运专线隧道底鼓病害变形监测研究

Research on the railway tunnel bottom upwarp defect deformation monitoring of a passenger dedicated line in southwest mountainous area

西南山区铁路客运专线具有高桥隧比、沿线地质条件复杂恶劣等特征,在建设和运营过程中易出现各类工程病害。文章基于某隧道底鼓变形病害,设计并开展包含围岩变形、仰拱受力和道床板沉降变形3个监测指标的隧道变形监测方案。通过对监测数据进行分析,获取隧道和围岩受力变形的演化规律,据此提出后续加密轨道几何形位静态、动态检测和衬砌结构贯通裂缝观测、实施列车降速运行等处理措施。相关研究可为该客运专线的安全运营提供有力保障,同时为类似工程隧道病害的监测和整治工作提供有益参考。

Passenger dedicated railway lines in the southwestern mountainous area have the characteristics of a high bridge tunnel ratio,complex and harsh geological conditions along the line,and is prone to various engineering defects during construction and operation.Based on the deformation defect of a certain tunnel's bottom drum,this article has designed and implemented a tunnel deformation monitoring plan that includes three monitoring indicators:rock deformation,inverted arch stress,and the settlement deformation of road bed plates.By analyzing monitoring data,the evolution principles of tunnel and surrounding rock stress deformation is obtained,and based on this,it proposes disposal measures such as the subsequent encryption of track geometry static and dynamic detection and lining structures through crack observation,the implementation of train speed reduction operation measures,etc.The relevant research could provide powerful safeguards for the safe operation of this dedicated passenger line,and also provide useful references for the monitoring and remediation of tunnel defects in similar engineering projects.