摘要
双重置换管幕工法在大断面穿越工程中能有效控制施工期间的地面沉降,减小对地面交通的影响,有利于城市环境的保护。为研究该工法的可行性,本文针对工具式钢管顶推开挖土体和箱涵置换钢管推进施工两个工况进行了三维数值模拟。重点讨论该工法施工引起的路基地表沉降变形特征和规律。计算结果表明,理想状态下数值模拟结果较好地反映了实际工程中观测点的沉降变化情况,表明计算模型是可靠的。根据实测数据分析,地表最大沉降基本控制在30 mm以内,能满足规定的地表沉降要求,表明采用双重置换管幕工法是合理可行的。
Adopting the pipe-roof by dual replacement of steel tube and box culvert advancing scheme for the vehicle tunnel construction under railway roadbed can reduce the interference to ground traffic during construction,and the ground settlement can also be well controlled. For the case of safety,the 3D numerical simulation of construction has been carried out. The characteristics of ground settlement have been analyzed during the construction of steel pipe and box culvert advancing. The results of numerical simulation about ground settlement are all well coincidental with the measured ones in site,which have been well controlled within 30 mm,and meet the limitation of allowable value for ground settlement. It indicates that application of the pipe-roof by dual replacement of steel tube and box culvert advancing scheme under railway roadbed is feasible.
出处
《地下空间与工程学报》
CSCD
北大核心
2015年第5期1271-1275,1288,共6页
Chinese Journal of Underground Space and Engineering
关键词
数值模拟
双重置换管幕工法
箱涵顶进
地表沉降
numerical simulation
pipe-roof by dual replacement
box culvert advancing
ground settlement
