Parameters Modification of Peck Formula for Surface Settlement of Shield Tunnelling in Luoyang

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Parameters Modification of Peck Formula for Surface Settlement of Shield Tunnelling in Luoyang

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[1]GAO Xinjun,WEI Wenyu,LI Shanshan,et al.Parameters Modification of Peck Formula for Surface Settlement of Shield Tunnelling in Luoyang[J].Journal of Zhengzhou University (Engineering Science),2025,46(01):75-81.[doi:10.13705/j.issn.1671-6833.2025.01.010]

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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 46 Number of periods: 2025 01 Page number: 75-81 Column: Public date: 2024-12-23

Title:: Parameters Modification of Peck Formula for Surface Settlement of Shield Tunnelling in Luoyang

Author(s):: GAO Xinjun; WEI Wenyu; LI Shanshan; SU Qinghui; School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China

Keywords:: unnel shield; silty clay and sand gravel composite formation; Peck formula; linear fitting; surface settlement; correction factor

CLC:: U455

DOI:: 10.13705/j.issn.1671-6833.2025.01.010

Abstract:: In order to accurately predict the surface settlement of the shield tunnel in the silty clay and sand gravel composite formation in Luoyang, a linear regression fitting method was proposed. To fit a certain section of Luoyang subway by the monitoring data of surface settlement during shield tunneling, maximum surface settlement correction factor α and settlement tank width correction factor β were brought out modifying the single-line Peck formula. The results indicated that for single-line tunnels, the linear regression method used to fit the surface settlement curve of the tunnel cross-section was in highly consistent with the actual monitoring data. When the correction factor α within the range of 0.4 to 0.9, and β within the range of 0.5 to 0.7, the corrected Peck formula obtained the highest accuracy. For double-line tunnels, the surface settlement under the formation was basically in a bimodal "W" shape. Double-line tunnel’s soil loss rate η and the distribution range of the width coefficient of the settlement tank K was 0.2% to 0.8% and 0.2 to 0.5, respectively and the mean values were 0.45% and 0.37, respectively. The average soil loss rate of the leading line and the average width coefficient of settlement tank was 1.4 times and 1.3 times of the rear line, respectively. The research results provided data support for the subsequent construction of the shield tunnel in the typical silty clay and sand gravel composite formation in Luoyang.

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Last Update: 2024-12-31