隧道穿越碎裂大涌水岩体变形破坏机理及处治对策  

Deformation and Damage Mechanism of Tunnel Crossing Fractured Rock Body with Large Surge of Water and Treatment Countermeasures

作　　者：杨会林 YANG Huilin(China Railway 20th Bureau Group Co.Ltd.,Xi′an Shaanxi 710016,China)

机构地区：[1]中铁二十局集团有限公司,陕西西安710016

出　　处：《铁道建筑技术》2024年第7期121-124,共4页Railway Construction Technology

基　　金：中铁二十局集团有限公司科技创新项目(YF1802SD02B)。

摘　　要：隧道穿越碎裂岩体施工过程中易发生坍塌、涌水突泥等事故,严重影响隧道的安全施工和工程进度。以雅康高速前碉3号隧道为工程背景,通过现场勘测,分析了隧道变形破坏机理,通过数值计算确定了超前支护的关键参数,并提出了综合治理措施。现场试验结果表明,采用围岩变形处治措施后,拱顶和左右拱腰监测点的最大变形量分别为134、109、118 mm,钢拱架和二次衬砌最大应力值分别为128、83 kPa,有效控制了隧道围岩的变形破坏。研究结果对隧道穿越碎裂岩体围岩稳定性控制具有重要意义。Tunnel through the fractured rock body construction process is prone to collapse,water and mud surge and other accidents,seriously affecting the safe construction of the tunnel and project progress.Taking the Yakang Expressway Qiandiao Tunnel No.3 as the engineering background,the tunnel deformation and damage mechanism was analyzed through on⁃site investigation,the key parameters of over⁃support were determined through numerical calculation,and comprehensive governance measures were proposed.Field test results show that,after the use of surrounding rock deformation treatment measures,the maximum deformation of the arch and the left and right arch waist monitoring points were 134 mm,109 mm and 118 mm,respectively,and the maximum stress value of the steel arch and the secondary lining was 128 kPa and 83 kPa,respectively,which effectively controlled the deformation damage of the tunnel surrounding rock.The results of the study are of great significance to the stability control of the surrounding rock of the tunnel through the fractured rock body.

关 键 词：碎裂岩体 隧道工程 变形破坏机理 综合控制 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]