隐伏溶洞对隧道围岩稳定性的数值模拟研究

为分析隐伏溶洞对隧道围岩稳定性的影响,本文以辽宁某在建隧道为工程背景,采用MIDAS/GTS NX有限元数值模拟方法对不同溶洞跨度、不同隧道与溶洞之间距离进行数值模拟研究,分析了不同工况下隧道的拱顶、拱底、边墙的位移变化情况,并对隧道周围岩体的拉压应力分布进行了分析.结果表明:隧道拱顶沉降位移、拱底隆起位移、左边墙收敛...

Numerical simulation for effect of hidden karst cave on stability of tunnel surrounding rock

To analyze the effect of hidden karst cave on the stability of the surrounding rock of the tunnel,taking a tunnel under construction in Liaoning,this paper used MIDAS/GTS NX finite element numerical simulation method,simulated different karst cave spans and different distances between tunnel and karst cave,analyzed displacement changes of the tunnel vault,arch bottom and sidewall under different working conditions,and studied tension and compression stress distribution of tunnel surrounding rock mass.The results showed that the tunnel vault settlement displacement,arch bottom uplift displacement,left wall convergence displacement,and right wall convergence displacement,maximum tensile stress,and maximum compressive stress gradually decreased with the increase of cave span,and when the cave span was more than twice the tunnel span,the variation of each parameter gradually decreased.With the increase of tunnel spacing,the tunnel vault settlement displacement,arch bottom uplift displacement,left wall convergence displacement,and right wall convergence displacement,maximum tensile stress and maximum compressive stress all increased.When the tunnel spacing was more than twice tunnel height,the variation of all parameters gradually slowed down.