OPTIMIZATION OF PECK FORMULA BASED ON KUNSHAN SOFT SOIL TUNNEL PROJECT
Ground deformation caused by underground engineering construction is a continuous concern. The Peck formula method is widely used to predict surface subsidence in engineering. However,due to the differences in geo-logical conditions,water level conditions,and construction methods,the original Peck prediction formula cannot be applied to all projects well. For underground engineering construction in special geographical environment,the origi-nal Peck formula needs to be optimized. Taking a shield section of Suzhou rail transit line S1 as the case,the surface settlement data of 34 groups of monitoring sections are taken,and the linear regression method is used to study the surface settlement caused by shield construction in deep soft soil layer of Kunshan city,Suzhou. The Peck correction formula is proposed,which is in line with the characteristics of Kunshan soft soil layer,and the measured data of oth-er shield sections are taken for verification. It is concluded that when α is in the range of 0.38～1.0 and β is in the range of 0.611～0.815,the modified Peck formula is more accurate in predicting surface settlement than the tradition one,which may providethe reference for subway shield construction in Kunshan area.
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