顾及硬化路面厚度的盾构施工地面沉降预测方法OA北大核心

Shield tunneling in urban metro systems often causes ground settlement.To address the dif-ferences in the mechanical properties between the rigid pavement layer and the soil layer,a modified Peck formula that considers pavement thickness was proposed.First,the tunnel depth in the classical Peck formula was modified,and a functional relationship for the equivalent burial depth was proposed.Then,ANSYS numerical simulation was employed to analyze the influence of different pavement lay-er thicknesses on the ground settlement during shield tunneling.The results showed that:(1)the pave-ment layer had a significant impact on surface settlement,with the maximum settlement decreasing from-29.38 mm without a pavement layer to-23.27 mm when the pavement thickness was 0.5 m.(2)Under identical soil layer thickness and tunnel depth,both the settlement trough width coefficient and the maximum settlement exhibited a linear positive correlation with pavement thickness,with cor-relation coefficients exceeding 0.972.(3)Based on the simulation results,the Peck formula was modi-fied,and the equivalent parameters for pavement layer and soil layer thicknesses were 2.55 and 1.00,respectively.Finally,the method was applied to Suzhou Metro Line S1 and Beijing Metro Line 7.The results showed that the evaluation indicators of the prediction results in both regions decreased.The Mean Absolute Percentage Error(MAPE)in Suzhou was reduced by 5%and 19%,while the Root Mean Square Error(RMSE)in the two sections of Beijing was reduced by over 0.97 and 0.53,respectively.The application with different pavement thicknesses under two different geological condi-tions and design standards confirms the multi-regional adaptability of the settlement prediction method considering pavement layer thickness.