Zwara Łukasz, Bałachowski Lech
Department of Geotechnical and Hydraulic Engineering, Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, G. Narutowicza 11/12, 80-233 Gdańsk, Poland.
Materials (Basel). 2022 Mar 25;15(7):2426. doi: 10.3390/ma15072426.
This paper presents different CPT methodologies for the prediction of the pile shaft resistance in tension on the example of three reference screw piles of the Jazowa test site in Poland. The shaft capacity was estimated based on the cone resistance, sleeve friction and CPT excess pore water pressure. Three piles with a diameter of 0.4 m and the length varied from 8 m to 14.6 m were subjected to static load tests in tension. Their results were used to determine the ultimate bearing capacity of the reference piles. The pile shaft resistance was estimated according to the AFNOR standard, Doan and Lehane 2018 centrifuge tests based method (Delft University of Technology approach), the Modified Unicone method, KTRI (Kajima Technical Research Institute) and LCPC (Laboratoire Central des Ponts et Chaussées) method. Then, the ultimate bearing capacity determined in static load tests was compared to the estimated values according to five different methods. The best estimation, fitting almost perfectly to static load test values, was obtained with the AFNOR method, whereas the other predictions significantly underestimated the ultimate bearing capacity.
本文以波兰Jazowa试验场的三根参考螺旋桩为例，介绍了用于预测抗拔桩桩侧阻力的不同静力触探（CPT）方法。基于锥尖阻力、侧摩阻力和CPT超孔隙水压力估算桩身承载力。对三根直径0.4m、长度在8m至14.6m之间变化的桩进行了抗拔静载试验。试验结果用于确定参考桩的极限承载力。根据法国标准（AFNOR）、Doan和Lehane 2018年离心机试验法（代尔夫特理工大学方法）、改进单锥法、日本鹿岛技术研究所（KTRI）和法国路桥中央实验室（LCPC）方法估算桩侧阻力。然后，将静载试验确定的极限承载力与根据五种不同方法估算的值进行比较。采用AFNOR方法得到了最佳估算结果，几乎与静载试验值完美拟合，而其他预测方法则显著低估了极限承载力。
