岩土参数对桩基性能影响的随机有限元分析

The Sensibility Analysis of Variables Influencing Pile Foundation Performances by Stochastic FEM

将岩土材料参数作为随机变量来考虑,通过现场勘探取原状样,进行土工实验,结合经验资料,确定岩土材料参数分布函数。用蒙特卡罗随机有限元法分析随机变量对桩基工作性能影响的敏感性,如桩端应力、位移。得到影响单桩桩端位移、桩端应力最显著的因素均是桩土间粘聚力,其次是桩土间摩擦因数。并且桩端位移、应力与桩土间粘聚力、摩擦角均呈负线性关系。

Being regarded as random variables,the geotechnical parameters can be determined by combining the data from geotechnical test of undisturbed sample in site exploration and the empirical data.The influence was analyzed which random variables have on the pile foundation working performances,such as stress and strain of pile tip,by Monte Carlo stochastic FEM.The conclusion is that:which has the most influence on stress and strain of pile tip is the cohesion between pile and soil,and friction coefficient between pile and soil next.The stress(strain) of pile tip and the cohesion(friction coefficient) between pile and soil has a negative correlation.