摘要
依托新建京张铁路清华园隧道工程,使用有限差分软件对大直径泥水平衡盾构的浅覆土始发掘进进行数值模拟。结果表明,未加固地层条件下,盾构始发时开挖面无法自稳。通过对比分析不同加固范围条件下洞门中心土体的挤出变形以及地表沉降变化规律,提出盾构始发地层加固的最佳范围,并获得在该加固范围下土体扰动引起的地表位移分布特征。
Based on the Tsinghuayuan tunnel project of the newly-built Beijing-Zhangjiakou Railway,finite difference software is used to simulate the launching of large-diameter slurry balance shield under shallow overburden.The results of the simulation show that the excavation face can’t remain stable while the launching is performed under the condition of unconsolidated stratum.By comparing and analyzing the deformation of the center soil of the portal part and the law of surface settlement under different reinforcement ranges,the optimal range of reinforcement in launching section is proposed and distribution characteristics of surface settlement are obtained.
作者
刘方
高峰
徐汪豪
LIU Fang;GAO Feng;XU Wang-hao(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Railway Engineering Design and Consulting Group Co.,Ltd.,Beijing 10055,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China)
出处
《铁道标准设计》
北大核心
2019年第2期104-109,共6页
Railway Standard Design
关键词
铁路隧道
盾构隧道
泥水平衡盾构
浅覆土掘进
数值模拟
地表沉降
Railway tunnel
Shield tunnel
Slurry pressure balanced shield
Tunneling under shallow overburden
Numerical simulation
Surface settlement
