摘要
针对兰州地铁一号线东岗站后配线区间浅埋隧道,对其施工开挖分别采用三台阶法与CRD法进行数值模拟研究。计算结果表明,当采用CRD法施工时,目标断面所在地表最大横向沉降量以及沿隧道轴线方向拱顶最大下沉量分别较三台阶法施工时小7 mm和6.4 mm;衬砌在各选定断面的最小安全系数,除入口断面外,其余均满足规范要求,而三台阶法施工时衬砌只在中间断面能满足要求;两种工法在隧道拱脚处均出现塑性区,但采用CRD法施工时的塑性区面积明显较小。据此建议采用CRD法施工并为同类工程施工提供参考。
A numerical analysis of construction excavation has been conducted by using the CRD method and tri-step method respectively for the shallow embedded tunnel at Donggang station sidings of Lanzhou metro line 1. The results of calculation show that the maximum ground surface settlemen at target section and the maximum vault subsidence along the axial direction are 7 mm and 6.4 mm more that calculated by the tri-step method; the minimum safety factor of the lining at the selected section shall meet the requirements of the codes except the portal section, while which can meet the requirements of codes only at the middle section by tri-step method; plastic zone appears at arch foot by both method, but the size of plastic zone is significantly smaller by CRD method than that of tri-stepmethod. Accordingly, CRD method is suggested, which can provide a reference for similar engineering construction.
出处
《南阳理工学院学报》
2013年第6期92-95,共4页
Journal of Nanyang Institute of Technology
关键词
浅埋地铁隧道
CRD
三台阶
数值模拟
shallow embedded tunnel
CRD method
tri-stepmethod
numerical simulation
