重复荷载作用下粉土永久变形预估模型

Prediction Model of Silt Permanent Deformation under Repeated Load

利用万能材料试验系统,在不同含水量、压实度和偏应力等影响因素下,对粉土进行了重复荷载三轴试验;同时根据永久变形试验结果和Tseng-Lytton永久变形预估模型形式,对Tseng-Lytton模型进行了改进和标定,建立了含水量与回弹模量双重因素影响下的粉土永久变形预估模型。可信度分析结果表明,所建立的模型可用于粉土的永久变形预估,但所建立的预估模型有必要在以后的工作中根据现场实际情况提出合理的修正系数。

With universal material test system,under different water content,compactness and deviator stress,repeated load tri-axial test is carried out on silt.At the same time,through modification and calibration of Tseng-Lytton model according to permanent deformation test result and Tseng-Lytton permanent deformation prediction model,the prediction model of silt permanent deformation is established under double influencing factors of water content and resilience modulus.It is indicated from reliability analysis that the established model may be used for prediction of silt permanent deformation,but reasonable correction factor is necessary for the prediction model according to site practical situation in future.