偏压小净距隧道初期支护施工力学研究

Mechanical Study on Initial Support Construction of Bias Neighborhood Tunnels

为研究不同施工顺序下偏压小净距隧道初期支护及周边围岩的稳定性,采用有限元法进行数值模拟,结合初期支护内力、围岩变形和塑性区范围的计算结果进行比较分析,得到隧道周边围岩的变形原因及规律,提出以隧道间土体受力状态为主要依据进而确定施工顺序的结论,为类似隧道工程提供参考依据。

In order to study the stability of initial support and surrounding rock of the bias neighborhood tun-nels under different construction sequences,finite element method was used for numerical simulation.Combined with the calculation results of initial support stress,surrounding rock deformation and plastic zone range,the cause and law of the surrounding rock deformation were obtained.It was shown that the construction sequence should be determined based on the stress state of the surrounding rock between tunnels,which provide a refer-ence basis for similar tunnel projects.