自平衡试桩结果的解析转换法

提出了一种自平衡试桩结果转化成传统静载试验曲线的解析法．假定桩侧土符合双折线模型、桩端土符合三折线模型，采用荷载传递法分别推导了自平衡试桩上、下段桩的荷载-沉降的解析解．通过对上、下段桩的实测荷载-沉降曲线的拟合，得到抗剪刚度系数和抗压刚度系数等计算参数，再利用解析解将自平衡试桩结果转换成传统静载荷试验曲线即解析转换法．该方法的转换结果与实测桩载荷曲线以及荷载传递位移协调法的转换结果比较，吻合较好，具有较高的精度；相比其他转换方法，该方法具有理论完整、不需实测传递函数、简单实用等优点．

Analytical Solution Transformation Method for Data of O-cell Pile Testing

An analytical solution transformation method(ASTM) of transforming the data of the O-cell pile testing method into the conventional load-settlement is put forward.Firstly,on the assumption that pile lateral soil is simulated by bilinear load-transfer function and pile toe soil be simulated by trilinear load-transfer function,an analytical solution of load-settlement for the upper and the lower pile of the O-cell pile testing is presented.Secondly,the parameters such as axis stiffness and shear stiffness can be obtained by fitting the measured data of the upper and the lower pile.Finally,the data of the O-cell pile can be transformed into the conventional results.The result of ASTM is close to the measured loading-settlement curve and that of the load transfer displacement coordinate transformation method(LTDCTM).Compared with the other methods,ASTM has its own advantages:complete in theory,simple,practical and in no need of the measured loadtransfer function.