公路隧道下伏采空区施工影响数值模拟分析

Numerical Simulation Analysis on Effect of Underlying Goaf in Road Tunnel Construction

摘要:

随着公路隧道的不断兴建，一些工程不可避免地要穿越采空区，相应地会给隧道的施工带来风险与潜在危害。从下伏采空区与隧道的空间相对位置建立有限元数值模型，分析不同距离条件下采空区对隧道结构之间的影响。计算结果表明，下伏采空区的存在对公路隧道结构和围岩稳定性的影响是显著的，当采空区与隧道的距离小于10 m时，其不利影响非常明显，施工中必须采取较强的预加固措施；下伏采空区对隧道结构影响的临界距离约为40 m，当此距离小于40 m时，必须考虑采空区对隧道结构和围岩稳定性的不利影响。

关键词:公路隧道;下伏采空区;施工影响;距离;数值分析

Abstract:

Some road tunnel construction projects inevitably pass through goaf area with risk and potential danger. A finite element numerical model was established to simulate the situation between tunnel and underlying goaf and analyze the influence of underlying goaf on tunneling safety under the conditions of different distance from the underlying goaf to the tunnel. The result shows that the influence of underlying goaf on road tunnels is obvious, when the distance between tunnel and goaf is less than 10 m, the effect is dramatically significant, and some pre-reinforcement methods must be taken for safety. The critical distance that underlying goaf will affect tunneling safety is about 40m, and when the distance is less than 40 m, the adverse effect must be taken into consideration in the design and construction.

Key words:road tunnel; underlying goaf; construction effect; distance; numerical analysis