Pile jacking-in effects considering stress anisotropy of natural clay#br#
LI Lin1，2，LI Jingpei1，2，SUN Dean3，YUE Zhuwen1，2
(1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education，Tongji University，Shanghai 200092，China；2. Department of Geotechnical Engineering，Tongji University，Shanghai 200092，China；
3. Department of Civil Engineering，Shanghai University，Shanghai 200072，China)
Abstract：The Cam-clay model modified for the K0-consolidated anisotropic clay，which can properly describe the initial stress anisotropy and stress-induced anisotropy of the natural saturated clay，was used to derive a theoretical solution to the cavity expansion due to pile jacking-in. The method of calculating the resistance of pile sinking is presented. To verify the validity of the theoretical solution，a centrifuge test of pile jacking-in was carried out in K0 consolidated clay. The soil stress，pore water pressure and pile-sinking resistance were studied in detail by comparing the measured data with the predicted data. The results show that the proposed mechanical model reflects the pile jacking-in effects properly due to the intrinsic properties of the natural clay being sufficiently considered. The proposed solution provides a theoretical base for pile construction and bearing capacity determination.
2016, Vol. 35 
