地铁施工考虑流固耦合效应对地表沉降影响

Subway construction considering fluid-solid coupling effect on ground settlement

为探索城市浅埋隧道在流固耦合作用下产生的地表沉降,基于流固耦合分析理论,以某城市地铁隧道为例,运用有限差分软件FLAC-3D建模计算,对比分析了考虑流固耦合效应与否的地表沉降量,并与实际检测值比较;绘制出竖向位移等值线;并在流固耦合作用下,研究了不同地下水位高度的隧道施工对地表沉降的影响.结果表明:流固耦合作用下,地表沉降值与实测值基本吻合;隧道开挖周围区域等值线密集;地下水位高度对隧道施工的地表沉降量影响较大.

To explore the effect analysis of tunnel construction on the shallow city surface subsidence under fluid-solid coupling effect, basing on the analysis theory of fluid-solid coupling, and taking a city subway tunnel as an example, this paper used the finite difference software FLAC-3D modeling calculation to compare and analyze the consideration of the surface subsidence under fluid-solid coupling effect, and compared with the actual values. The vertical displacement contour was drawn and the impact of the different underground water level effecting on the surface subsidence under the influence of fluid- solid coupling effect was discussed. The results show that under the action of fluid-structure interaction, the surface subsidence value was consistent with the actually measured value; Area around tunnel excavation contour is intensive; the underground water level height has an important influence on surface subsidence of the tunnel construction.