摘要
针对浅埋大跨小净距隧道施工步骤复杂,施工进度慢的问题,提出采用微桩锁脚台阶法进行浅埋大跨小净距隧道施工。分析了微桩锁脚台阶法力学作用机制,微桩模型可较好地进行台阶强锁脚,有效地发挥锁脚的支撑潜力,扩大台阶法的应用范围,结合龙池东路隧道对比分析了CD法和“微桩锁脚台阶法”的应用效果,表明微桩锁脚台阶法可达到等同于CD法的施工效果,采用理论分析和工程现场监控量测进一步对结果进行对比分析,表明微桩锁脚台阶法实际应用效果良好。结果可为浅埋大跨小净距隧道施工提供新思路。
The construction process of shallow buried large span and small clear distance tunnel is complex and the construction progress is slow.The step method of micro-pile locking foot was proposed for the construction of shallow buried large-span and small clear distance tunnels,and the mechanical action mechanism of the step method of micro-pile locking foot was analyzed.The micro pile model can be better applied to the mechanical analysis of the strong lock foot,effectively play the support potential of the foot lock,and expand the application scope of the bench method.The step method of micro-pile locking foot can achieve the construction effect equivalent to CD method.The results of theoretical analysis and engineering field monitoring measurement were further compared and analyzed,which showed that the practical application effect of step method of micro-pile locking foot was good.The results can provide a new idea for the construction of shallow buried large span and small clear distance tunnels.
作者
刘立宏
赵晓勇
LIU Lihong;ZHAO Xiaoyong(China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an,Shannxi 710043,China)
出处
《河北工程大学学报（自然科学版）》
CAS
2022年第2期80-85,99,共7页
Journal of Hebei University of Engineering:Natural Science Edition
基金
陕西省重点研发计划(2022SF-198)。
关键词
浅埋隧道
锁脚微桩
力学机制
净距隧道
shallow tunnel
micro-pile locking foot
mechanical mechanis
closely spaced tunnels
作者简介
刘立宏(1990-),男,陕西西安人,硕士,工程师,从事隧道与地下工程设计研究工作;通讯作者:赵晓勇(1982-),男,陕西西安人,硕士,正高级工程师,从事隧道与地下工程设计研究工作。
