Abstract:Jiluo Road Tunnel is the first co-constructed shield tunnel of municipal road and rail transit under the Yellow River. The application of the basic Peck formula is limited in predicting the settlement value of the Yellow River Levee caused by shield tunnelling. Based on the existing researches, the three-dimensional Peck formula for oversized-diameter slurry balanced shield tunnel is proposed. Its imitative effect of settlement data from the prediction of lateral settlement calculation and prediction of longitudinal settlement calculation with the measured settlement data of the Yellow River Levee is good. Through the relevant parametric analysis, it can be concluded that with the increase of vertical depth below the surface, the form of the settlement groove becomes deeper and narrower. The maximum settlement value increases and the lateral influence range decreases. The settlement curve protrudes upwards and the lateral settlement no longer satisfies Gaussian distribution after the vertical depth exceeds the critical value. The change of settlement groove form is related to the lateral spacing of the tunnel, the width of the settlement groove, the relative burial depth of the tunnel and the geological conditions. The stratum of the levee has been disturbed after the first line shield tunneling under the levee. During the second line shield tunneling under the levee, the cumulative settlement value and loss rate of the levee stratum are greater.
