盾构隧道斜交下穿黄河堤防的Peck沉降公式参数研究OA

Shield tunnel excavation beneath levees induces settlement deformation that poses a direct threat to levee integrity.Focusing on the planar oblique crossing between a shield tunnel and an embankment,this study investi-gates the effect of the horizontal oblique angle on the parameters of the classical Peck formula within an oblique coor-dinate framework.A modified approach for determining Peck formula parameters,incorporating a correction for the horizontal oblique angle,is proposed.Based on the Huanggang Road Tunnel project crossing beneath the Yellow River in Jinan,a field monitoring system was established to measure post-construction embankment settlement.The ground loss ratio and settlement trough width parameter,considering the influence of the horizontal oblique angle,were back-analyzed using the least squares regression method.The results show that the average settlement trough width parameter for the embankment strata in the Jinan section of the Yellow River is approximately 0.43,and the average ground loss ratio is about 0.31％.Neglecting the horizontal oblique angle leads to an overestimation of these parameters by approximately 12％,which may result in improper judgments regarding code compliance.Validation using measured data from the Jiluo Road Tunnel crossing beneath the Yellow River demonstrates that the proposed parameters offer satisfactory predictive capability and practical engineering applicability.