摘要
北京地铁8号线某区间隧道为明挖法施工,使用钻孔灌注桩和钢支撑支护。通过FLAC3D数值模拟软件对围护桩的设计参数进行模拟,得到了较可靠的模拟结果。模拟结果表明:增加桩长和桩径,在一定范围内可以有效地控制基坑变性、提高基坑稳定性;但是持续增加桩长和桩径对基坑稳定性的增加效果不大,反而会增加经济成本。通过与现场实测数据的对比,验证了模拟结果的可靠性。
Open cutting method is used in Beijing metro Line 8 tunnel construction, with bored piles and steel support. By u- sing FLAC3D numerical simulation software, the design pa- rameters of the retaining piles are simulated, a reliable result is obtained. The simulation shows that, by increasing the pile length and pile diameter within a certain range, the pit degen- eration can be effectively controlled, the stability of foundation pit be improved. But constant increase of the pile length and pile diameter can not improve the stability of foundation pit obviously, instead, the cost will be increased. Finally, the relia- bility of the simulation result is verified by comparing with the field tested data.
出处
《城市轨道交通研究》
北大核心
2017年第5期47-49,170,共4页
Urban Mass Transit
关键词
地铁基坑
稳定性
围护桩
桩长
桩径
metro foundation pit
stability
retaining pile
pile length
pile diameter
