动载荷大应变检测桩承载力土反力模型研究

Soil resistance model in high stains for dynamically testing bearing capacity of piles

为了提高动测法的预测精度,在分析桩的荷载-沉降关系Q-S曲线的基础上建立了一个双曲线土反力模型,并给出了参数的取值方法.按该模型推导了相应的动力打桩公式.通过26根桩的静载荷试验和动测资料与H iley动力打桩公式进行了对比,结果表明,本文方法预测桩承载力较H iley法更接近静载荷试验值,其计算精度也有所提高.

Based on the analysis of a load settlement Q - S curve of piles, a hyperbolic soil resistance model was built and a determination method of model parameters was given. In addition, a new pile driving formula was deduced with this model. Contrast analysis between this new pile driving formula and Hiley＇s dynamic pile driving formula was made with statistics and dynamic testing data from 26 piles. There were indications that the bearing capacity of piles calculated by the method in the paper are closer to statistical experimental values than Hiley＇s method, and the calculating precision of the method is also an improvement.