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建立了一种考虑桩侧阻软化的非线性指数荷载传递函数,并根据浙江地区实测工程资料,给出了各参数的取值方法及建议值。该侧阻软化函数中桩侧摩阻力残余值!f与峰值!u之比βs越小,软化现象越明显,残余强度越低;桩侧阻出现软化时的极限位移Su与桩侧阻跌落至残余强度时的桩土位移值Ss之比βc越大,软化现象越明显,残余强度越低。参数Su决定侧阻软化函数的临界点,即出现软化时的极限位移;参数!u决定了桩侧极限摩阻力值的大小。经过大量实测工程资料统计得出:βs约为0.84～0.98,结构性强的土质取小值;βc约为0.42～0.69,结构性强的土质取小值。应用本文提出的侧阻软化函数对实测工程进行计算,结果表明,计算值与实测值很接近,说明本文建立的侧阻软化函数能够很好地反映桩出现侧阻软化时的桩土荷载传递关系。
A nonlinear exponential load transfer function considering lateral softening of the pile is established. Based on the measured data of Zhejiang Province, the method and the recommended value of each parameter are given. The side resistance softening function in the pile side friction resistance value f and peak! U ratio βs smaller, the more obvious softening phenomenon, the lower the residual strength; pile side resistance softening occurs when the limit displacement Su and pile lateral resistance drop to The greater the ratio βs of pile displacement Ss when the residual strength is, the more obvious the softening phenomenon is and the lower the residual strength is. The parameter Su determines the critical point of the softening function of the side resistance, that is, the limit displacement when softening occurs. The parameter u determines the magnitude of the ultimate frictional resistance value of the pile side. After a large number of measured engineering data statistics: βs is about 0.84 to 0.98, structurally strong soil to take a small value; βc is about 0.42 to 0.69, structurally strong soil to take a small value. The calculated results are close to the measured values by using the lateral resistance softening function proposed in this paper. The results show that the lateral resistance softening function established in this paper can well reflect the load-transfer relationship between pile and soil when the lateral resistance softens .