Prediction Method of Surface Subsidence Caused by Construction of Shallow Buried Pipe Curtain and Its Bending

Aiming at the problem of surface subsidence control caused by the underground tunnel excavation method of the pipe curtain box culvert in the urban underpass engineering, this paper relies on an underground passage construction project in Nanchang, based on the random medium theory and the Navier solution of the elastic thin plate model, and proposes a prediction method of shallow buried pipe curtain. The calculation method is verified by combining on-site monitoring data and numerical model. This calculation method can enable the construction personnel to predict the surface settlement value caused by the underpassing project in advance. The research results show that: (1) this method has better prediction results for the final value of surface subsidence, and the error with the field measured data is not more than 10%; (2) the value of surface subsidence caused by soil loss is small, the maximum value is 0.52mm, It mainly controls the surface subsidence above the tandem pipe curtain; (3) The surface subsidence caused by the deformation of the pipe curtain is large, the maximum value is 1.70mm, and it mainly controls the surface subsidence above the channel.