摘要
以长沙西北下行联络线罗家一号隧道下穿新建杭长正线曾家岭一号隧道为工程背景,运用数值分析手段对浅埋条件下超近距离立体交叉隧道的施工顺序进行了详细分析。通过不同计算工况下围岩和衬砌结构位移场、应力场以及围岩塑性区的对比分析,得到"先下后上(先施工下洞后施工上洞)"的施工顺序明显优于"先上后下(先施工上洞后施工下洞)"的施工顺序。最后将该研究成果应用于工程实践指导施工,目前该工程已经顺利竣工,说明该文提出的施工顺序是可行的,安全可靠的。
Based on the project of Luojia tunnel 1 to Zengjialing tunnel 1 in Northwestern Changsha, construction order for shallow buried interchange tunnels with extra close distance is analyzed in detail. Through the comparison and analysis on the surrounding rock, displacement field of lining struc- ture, stress field and plastic zone of surrounding rock, it is known that construction order of＂ down first, up second＂ is superior than that of＂ up first, down second＂. The study result is applied to guide the construction and achieve the final goal. It is proved that the construction order presented is feasible and reliable.
出处
《重庆建筑》
2013年第5期35-38,共4页
Chongqing Architecture
关键词
浅埋隧道
超近距离
立体交叉隧道
施工顺序
数值模拟
全断面无支护开挖
台阶法加支护开挖
shallow buried tunnel
extra close distance
interchange tunnel
construction order
digital simulation
whole section excavation without support
step excavation with support
