车辆荷载引起隧道地表沉降数值模拟研究

Numerical Simulation of Tunnel Surface Settlement Due to Vehicle Loading

摘要: 本文对车辆荷载进行简化，将其作用在最优条件下建立的数值模型上方，通过改变车辆荷载的表达式研究隧道上方通行车辆的行车速度、车辆载重对隧道工程地表沉降的影响，结果表明相比无车辆荷载，研究范围内车辆行车速度的增大使得地表沉降增大38%~123%，且当时速由20 km/h增大至40 km/h时，车辆行车速度的影响更大；随着车辆载重的增大，地表沉降值越大且车辆载重对地表沉降的影响率越大，相比行车速度，车辆载重的影响作用更明显。因此在实际工程中，应限制上方通行车辆的速度及车辆载重，以保证地表沉降范围。

Abstract: This paper simplifies the vehicle load and puts it on the top of the numerical model established under the optimal conditions. By changing the expression of the vehicle load, we study the influence of the traveling speed of the vehicles passing over the tunnel and the vehicle load on the surface settlement of the tunnel project, and the results show that compared with the no-vehicle load, the increase of the vehicle speed within the study area makes the surface settlement increase by 38%~123%, and the influence of the vehicle speed is greater when it is increased from 20 km/h to 40 km/h; with the increase of the vehicle load, the value of the surface settlement is greater and the influence rate of the vehicle load on the surface settlement is greater. When the speed increases from 20 km/h to 40 km/h, the influence of vehicle speed is bigger; with the increase of vehicle load, the value of surface settlement is bigger and the influence rate of vehicle load on surface settlement is bigger, compared with the speed, the influence of vehicle load is more obvious. Therefore, in the actual project, the speed and load of vehicles should be limited to ensure the range of surface settlement.