doi:10.16186/j.cnki.1673-9787.2020060011

Received:2020/06/03

Revised:2020/09/29

Published:2022/03/15

Modification of Peck formula for ground settlement caused by shield tunneling in soil-rock composite stratum

LIU Junjie1, LIU Junwei1,2, REN Xiaomin3, JIA Ning1

1.School of Civil Engineering, Qingdao University of Technology, Qingdao  266033 , Shandong, China;2.Cooperative Innovation Center of Engineering Construction and Safety of Shandong Peninsnla Blue Economic Zone, Qingdao  266033 ,Shandong, China;3.Rail Transit Construction Co. ,Ltd. of China Construction Eighth Engineering Division Co. , Ltd. , Nanjing  210046 , Jiangsu, China

Abstract: In order to accurately predict the amount of ground settlement caused by shield tunnel construction in soil-rock composite stratum,the linear regression fitting method in mathematical statistics was adopted to fit the monitoring data of land subsidence of shield tunneling in a certain section of Qingdao metro line 8,and the Peck formula was corrected by introducing the correction coefficient α of the maximum surface settlement and the correction coefficient β of the settlement trough width.The results showed that the curve obtained by using linear regression to fit the horizontal settlement of the earth's surface had a high degree of agreement with the actual data,and the fitting result was highly significant,the accuracy of the modified Peck formula was the highest when the correction coefficient α was in the range of( 0.2,0.5) ,β was in the range of( 1.0,1.4) ,and the linear fitting curve was obtained when the corresponding regression constant term a was in the range of ( 1.6,2.8) and the regression linear coefficient b was in the range of( 0.010,0.022) .At the same time,the research results could provide some theoretical guidance for shield tunnel construction in similar soil-rock composite stratum.

Key words:soil-rock composite stratum;shield tunnel;surface settlement;Peck formula;correction coefficient;linear fitting

 土岩复合地层隧道盾构开挖地表沉降Peck公式修正_刘俊杰.pdf