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Correction Method of Axial Force Monitoring Value of Concrete Strut in Excavation(PDF)


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Correction Method of Axial Force Monitoring Value of Concrete Strut in Excavation
XU Zhao-chen12 WANG Qiang3 ZHANG Ding-wen12 ZHU Xiang-xu3 WANG Zhi-yu3
(1. School of Transportation, Southeast University, Nanjing 211189, Jiangsu, China; 2. National Demonstration Center for Experimental Road and Traffic Engineering Education, Southeast University, Nanjing 211189, Jiangsu, China; 3. China Construction Eighth Engineering Division Rail Transit Construction Co., Ltd, Nanjing 210046, Jiangsu, China)
excavation axial force of concrete strut non-load factor axial force correction
To investigate the abnormal alarm of axial force monitoring value of concrete strut in excavation project of Jurong station of Nanjing-Jurong rail, the theoretical axial force correction formula and the axial force correction coefficient based on field measurements were discussed by combining theoretical analysis and field measurements for non-load factors such as concrete shrinkage, creep, modulus of elasticity and temperature. The results show that the correction formula can correct the creep strain, shrinkage strain and temperature strain considering the non-linear changes in concrete modulus. The axial force correction value calculated by the formula is 55%-64% of the original monitoring value, and the corrected value can better reflect the real state of the concrete strut. The descending orders of the influence on the axial force are concrete creep, concrete shrinkage and concrete modulus, with creep having the most significant influence. Combined with the field measured data of this project, the empirical formula of the axial force correction coefficient of concrete strut in excavation of Jurong station with time is obtained, according to which a conservative correction value can be calculate directly. In engineering practice, the measured concrete axial force can be corrected by means of residual axial force measurement and steel box test. Based on the theoretical analysis, field measurement and measured data in the literatures, a correction coefficient of axial force of concrete strut can be taken as 0.5-0.65 when the non-load factors are considered.


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Last Update: 2021-11-01