垂直节理地层黄土类隧道坍塌过程与抢险措施  

Collapse Process and Emergency Measure of Loess Tunnel in Stratum with Vertical Joint

作　　者：江龙 JIANG Long(Beijing China Railway Tianrui Machinery Equipment Co.,Ltd.,Beijing 100043,China)

机构地区：[1]北京中铁天瑞机械设备有限公司,北京100043

出　　处：《工程技术研究》2024年第23期160-162,194,共4页Engineering and Technological Research

摘　　要：文章针对黄土地区垂直节理发育地层内的隧道坍塌问题,分析了坍塌事故发生的原因,研究了处理策略,并验证了处理措施的工程应用效果。研究结果表明,地下水持续作用导致开挖面垂直节理力学性能退化是引发工程事故的主要原因;采取“先截水、后封堵、最终加固”的处理策略,可有效避免发生二次灾害;对于已坍塌区域,采用型钢支架支护+喷锚支护方式重新开挖,对于未受影响区域,则采取地表旋喷桩加固处理+洞内双排超前管棚注浆的处理方案,避免后续施工中发生此类事故。Aiming at the problem of tunnel collapse in strata with vertical joint development in loess areas,this paper analyzes the causes of collapse accidents,studies the treatment strategies,and verifies the engineering application effect of treatment measures.The research results show that the degradation of the mechanical properties of the vertical joints in the excavation face caused by the continuous action of groundwater is the main cause of the engineering accident;the adoption of the treatment strategy of"water interception first,plugging later and final reinforcement"can effectively avoid the occurrence of secondary disasters;for the collapsed area,the structural steel bracket support+shotcrete-bolt support method should be used for excavation again,and for the unaffected area,the treatment scheme of surface jet grouting pile reinforcement+double-row advanced pipe roof grouting in the tunnel should be adopted,in order to avoid such accidents in the subsequent construction.

关 键 词：黄土类隧道 垂直节理地层 坍塌事故 

分 类 号：U45[建筑科学—桥梁与隧道工程]