MJS加固范围对隧道和地表变形影响

Effect of MJS reinforcement extent on tunnel and ground deformation

为了减小地铁隧道与出入口之间连接通道施工对拱顶和地表变形的影响,施工前需对土体进行加固。本文采用MIDASGTSNX有限元分析软件,分析MJS加固土体的效果。结果表明,拱顶和地表沉降主要发生在等截面隧道施工时,随着土体加固宽度的增大,隧道拱顶和地表沉降减小,加固宽度对隧道拱顶和地表变形影响较大;但当加固宽度超过一定值后,对减小拱顶和地表沉降的效果不明显。研究成果对工程施工有较好的指导意义。

In order to reduce the impact of the construction of the connection channel between the subway tunnel and the entrance/exit on the deformation of the vault and the ground surface, the soil body needs to be reinforced before construction. In this paper, MIDAS GTS NX finite element analysis software was used to analyze the effect of MJS reinforcement on the soil. The results show that the vault and surface settlement mainly occur during the construction of equal-section tunnels;with the increase of the soil reinforcement width, the tunnel vault and surface settlement both decrease;the reinforcement width has a greater effect on the tunnel vault and surface deformation, but when the reinforcement width exceeds a certain value, the effect on reducing the vault and surface settlement is not obvious. The research results have a good guiding significance for engineering construction.