摘要
成都—兰州铁路云屯堡隧道施工中发生了严重大变形,其特征是围岩变形量大、初期变形速率大、变形持续时间长、变形量受地下水的影响严重。理论分析、室内试验及模拟计算结果表明,该隧道大变形主要受应力扩容型机制、结构变形型机制、地下水软化型机制等的综合作用。采用圆形结构断面,增加预留变形量,并采取长短锚杆结合、双层型钢拱架、长锁脚锚管、径向注浆等控制措施予以整治,围岩变形控制效果明显。
During the construction of Yuntunpu tunnel on Chengdu-Lanzhou railway,serious large deformation occurred,which is characterized by large deformation of surrounding rock,large initial deformation rate,long deformation duration and serious influence of groundwater on deformation.The results of theoretical analysis,laboratory test and simulation calculation show that the large deformation of the tunnel is mainly affected by the comprehensive action of stress expansion mechanism,structural deformation mechanism and groundwater softening mechanism.The circular structure section is adopted to increase the reserved deformation,and the control measures such as the combination of long and short anchor bolts,double-layer steel arch,long lock foot anchor pipe and radial grouting are adopted to control the deformation of surrounding rock.The control effect of surrounding rock deformation is obvious.
作者
冉龙华
RAN Longhua(Chenglan Railway Co.Ltd.,Chengdu 610037,China)
出处
《铁道建筑》
北大核心
2021年第7期62-66,共5页
Railway Engineering
关键词
铁路隧道
控制技术
现场试验
千枚岩
软岩隧道
大变形
变形机制
railway tunnel
control technology
field test
phyllite
soft rock tunnel
large deformation
deformation mechanismn
作者简介
冉龙华(1972-),男,高级工程师,硕士。E-mail:459467509@qq.com。
