弱化饱和土层中桩的双曲型p-y曲线

Hyperbolic p-y Curve of Pile in Saturated Degradation Strata

通过桩与弱化土层相互作用的模型试验,研究了描述具有残余孔压弱化饱和土层双曲型p-y曲线参数的变化规律.结果表明,随土层中残余孔压比的增加,弱化饱和土层的水平极限抗力与土反力模量系数逐渐降低.为进一步分析弱化土层强度与p-y曲线参数的关系,引入了弱化饱和土层的等效强度参数.根据模型试验结果,结合有效应力原理,建立了依据土层等效强度确定土层水平极限抗力及土模量系数的方法.在此基础上,利用双曲函数构造弱化土层的p-y曲线,并与模型试验结果进行比较.结果表明,构造的双曲型弱化p-y曲线与模型试验测得的p、y关系基本一致.说明采用双曲函数构造弱化土层p-y曲线的方法是合理的.

Soil-pile interaction model tests were conducted to research variations of parameters determining hyper- bolic p-y curves in degraded saturated sands with residual pore water pressure. Test results showed that the lateral re- sistance and subgrade reaction modulus coefficient of the degraded saturated stratum gradually decreased with the increase of residual pore water pressure. To analyze the relationship between the strength and parameters determining hyperbolic p-y curves in degraded stratum, equivalent strength was introduced. Based on the test results and the princi- ple of effective stress, the methods of determining ultimate lateral resistance and subgrade reaction modulus coefficient of degraded strata were developed adopting the parameter of equivalent strength. The p-y curve determined by the hyperbolic function was compared with those of test results. It is shown that the hyperbolic p-y curves of degraded saturated strata were basically consistent with the relation ofp and y determined by the model test results, indicating that the method of determining p-y curves of degraded strata employing hyperbolic function is reasonable.