摘要
基于ADINA有限元程序构建三孔框构式引水隧道洞口段的二维计算模型,分别对无支护、注浆、管棚和管棚注浆加固等支护条件下隧道施工引起地表非线性变形进行数值模拟分析,揭示不同支护条件下的地表变形响应程度,管棚注浆支护引起地表沉降值的最小,其次是管棚支护和注浆支护。利用现场监测管棚变形和地表沉降,地表和管棚变形得到有效控制。研究结果表明,管棚注浆支护在浅埋松软地层隧道施工中取得良好的支护效果,从数值计算理论层面上,浅埋松软地层隧道采用管棚注浆技术是可行的,监测结果也验证管棚注浆支护技术的有效性和可靠性。
The two-dimensional computation models have been built by using the ADINA finite element program. Examples of seepage tunnels of shallow and surrounding soft rock of portal section of three-holes frame constructions are presented;and numerical analyses of the ground deformation response caused by tunnel excavation have been conducted under the condition of no support,grouting,pipe roof and grouting with pipe-roof,respectively. The minimum ground settlement is caused by grouting with pipe-roof,followed by pipe roof support and grouting support. The deformations of pipe roof and ground settlements caused by tunnel excavation are monitored in field and have been effectively controlled. The research results reveal that support effect of grouting with pipe-roof is very good in shallow soft stratum. Based on the theory of numerical calculation,the application of grouting with pipe-roof to shallow soft stratum is feasible. The validity and reliability of pipe-roof grouting are verified.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2013年第S2期4091-4097,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(51174268)
关键词
隧道工程
浅埋隧道
松软地层
管棚注浆支护
地表沉降
数值试验
现场监测
tunnelling engineering
shallow tunnels
soft stratum
pipe-roof grouting
ground settlement
numerical test
field monitoring
