软岩大变形隧道锚喷支护的力学效应及失效原因分析  

Analysis of Bolt and Shotcrete Support in Soft Large-deformation Tunnel

作　　者：谭显坤 左昌群[2] 刘代国 丁少林[2] 李皓晖 

机构地区：[1]十堰市路纬交通勘察设计有限公司,十堰442000 [2]中国地质大学(武汉)工程学院,武汉430074

出　　处：《科学技术与工程》2015年第8期228-232,243,共6页Science Technology and Engineering

基　　金：中央高校基本科研业务费专项资金(CUGL110215);国家自然科学基金(41202201)资助

摘　　要：目前隧道锚喷支护设计仍采用以经验为主的工程类比法,由此造成支护参数与围岩地质条件不能完全匹配,在软弱岩体隧道中常引发围岩失稳大变形现象。以油坊坪隧道为例,首先对现场围岩失稳及破坏特点进行了分析,运用剪切滑移理论对锚喷支护系统的力学效应进行计算分析。计算结果表明,设计的锚喷支护参数具有足够的安全度,现场围岩失稳主要是由于施工扰动,促使本来较为软弱破碎围岩进一步恶化,造成锚喷支护体系无法达到设计的支护抗力,加上远超过计算值的实际形变围岩压力最终形成剪切破坏;据此提出施工方面的建议,为类似条件下隧道施工避灾减灾提供参考。At present the tunnel bolt-shotcrete support design is still using the engineering analogy method based on the practice experience,and the supporting parameters and surrounding rock geological conditions cannot be completely matched which caused the supporting damage and large deformation in soft and weak tunnels. Taking You Fang-ping Tunnel as an example,the destruction characteristics and development process of bolting and shotcrete lining through the field investigation was analyzed. Using shear-slippage theory,the stability of shotcrete support has been calculated,the result showed that the designed bolt-shotcrete support parameters had enough secure reserve. The construction disturbance caused the weak rock mass into further deterioration which was resulting in shotcrete support system can not meet the design support resistance. The actual deformation larger than design value caused great rock pressure and the formation of shear failure ultimately. It can propose the suggestion for tunnel construction,and provide a reference for disaster prevention and mitigation under similar conditions.

关 键 词：高速公路隧道 软弱岩体 锚喷支护 剪切滑移理论 支护失效 

分 类 号：U455.72[建筑科学—桥梁与隧道工程]