倾斜地表下隧道开挖引起的三维地表沉降计算

为研究倾斜地表下隧道开挖引起的地表沉降计算方法,考虑倾斜地表对隧道埋深的影响,建立了倾斜地表下隧道开挖模型和三维情况下单元体开挖计算模型.采用随机介质理论,推导出三维倾斜地表下隧道开挖引起的地表沉降计算公式,并结合工程实例选取监测数据和计算数据对比验证,证明了计算方法的准确性.最后针对地表倾斜角度进行对比分析,表明地表斜面倾角越大,地表不均匀沉降越明显.该倾斜地表沉降计算方法对隧道开挖地表沉降预测有一定的工程价值和指导意义.

Calculation of Three-Dimensional Surface Settlement Caused by Tunnel Excavation Under Sloping Ground

In order to develop a good calculation method of ground settlement induced by tunnel excavation under inclined surface, considering the influence of inclined surface on the depth of the tunnel, a tunnel excavation model under inclined ground and a three-dimensional excavation model for unit excavation are established. Formulas for calculating the surface subsidence caused by the excavation of a three-dimensional tunnel under an inclined surface are derived, using the theory of stochastic medium. The accuracy of the calculation method is proved by the comparison and verification of the monitoring data and the calculation result. In the end, a comparative analysis is made of the surface inclination angles, the result of which shows that the greater the inclination angle of the surface, the more obvious the uneven settlement of the surface.