高速铁路软弱围岩隧道挤压变形控制技术

Study on the Control Technology of Extruding Deformation of High Speed Railway Tunnel with Weak Surrounding Rock

以云桂高铁新莲隧道1号斜井工区隧道挤压大变形为工程背景,针对已施工区段隧道支护结构大变形情况,开展试验段对支护参数进行优化,利用Ansys对支护结构受力情况进行了数值模拟计算.结果表明:正洞采用的HW175型钢拱架及平导采用的I型锚喷衬砌在围岩变形控制方面作用突出,Ф76锁脚锚管、纵向连接型钢、临时仰拱等措施对支护结构变形有较大的抑制作用.结合研究成果进一步提出软弱围岩及支护结构变形控制措施,为类似工程案例提供技术参考.

Based on the large deformation of the tunnel in the No.1 inclined shaft working area of Xinlian tunnel of Yunnan-Guangxi high speed railway,in view of the large deformation of the tunnel support structures in the constructed section,the test section was carried out to optimize the support parameters,and the numerical simulation of the support parameters of the test section was carried out using ANSYS.The research results show that,the HW175 steel arch frame used in the main tunnel and the I-type anchor shotcrete lining used in the flat guide play outstanding roles in the control of surrounding rock deformation.Measures such asФ76 locking foot anchor pipe,longitudinal connection steel,temporary inverted arch,etc.,have great effects on suppressing the deformation of support structures.Combined with the research results,the deformation control measures of weak surrounding rock and supporting structures are further proposed,which provides technical reference for similar engineering cases.