隧道施工对临近平行地下管线安全性影响

The security influence of the tunnel construction to the parallel underground pipeline

针对目前城市地铁施工中造成既有管线的破坏问题,采用数值计算的方法,深入研究隧洞开挖施工导致的地层变化引起的输水管线不同方向的位移、轴向和切向载荷,以及弯矩和扭矩的变化.研究结果表明:隧道开挖施工引起的输水管线的竖向垂直位移和水平位移可以采用高斯曲线拟合,但管线轴向位移变化则具有双峰特征.对于输水管线的轴向载荷和剪切荷载存在较大差异,可以采用不同函数进行拟合.输水管线所受弯矩和扭矩则具有互补性,对管线的安全运行影响较大.

Aiming at the existing pipeline damage problems in urban subway constructing, this paper adopted the numerical calculating method to study deeply the displacement of the pipeline in different direction, axial load and tangential load, the bending moment and torque moment caused by the ground deformation due to tunnel excavation construction. The results show that the water pipeline vertical and the horizontal displacement caused by tunnel excavation construction can be fitted in a Gaussian curve, but the axial displacement shows a bimodal characteristics. The water pipeline axial load and shear load may be fitted in different functions. And the water pipeline bending moment and torque moment maybe have complementary, and it have a larger impaction on safe operation of pipeline. It was revealed that the tunnel constructing affect to the water pipeline safe operations. This study provides a certain theoretical support in similar urban subway construction.