隐伏溶土洞对地铁盾构隧道影响的技术研究

A Technical Study on the Influence of Hidden Soil Cave on Subway Shield Tunnel

溶土洞的存在改变了隧道施工围岩支护系统的受力变形特征,不同空间分布的溶洞对隧道施工的力学行为影响不同。根据地质勘查资料可知,溶土洞位于基层的炭质石灰岩中,主要位于隧道底部,部分位于隧道之间。而本工程溶洞基本上与隧道底部相距较远,土洞与隧道底部相距较近。为此,本文就溶土洞的大小和距离隧道底部距离变化对盾构隧道受力、变形及围岩受力、变形特征的影响进行分析。

The existence of dissolved soil tunnel changes the mechanical deformation characteristics of surrounding rock support system in tunnel construction,and different spatial distribution caverns have different effects on the me chanical behavior of tunnel construction.According to the geological survey,it is revealed that the karst cave is locat ed in the carbonaceous limestone of the base course,mainly at the bottom of the tunnel and partly between the tun nels.And the cave of this project is far away from the bottom of the tunnel,while the earth hole is close to the bottom of the tunnel.In this paper,the influence of the size of the karst hole and the distance from the bottom of the tunnel on the stress,deformation and deformation characteristics of the surrounding rock were analyzed.