考虑应力历史影响的高填方地基蠕变沉降简化预测算法OA

Creep settlement is the main component of post-construction settlement of foundations,and its prediction is an important basis for arranging subsequent construction and judging the long-term stability of foundations.First,modify the traditional power-law model so that it can describe the one-dimensional creep deformation of soil elements,ensuring that the deformation tends to a constant value over time rather than increasing indefinitely.Secondly,based on Hypothesis B and Bjerrum's classification of creep deformation,a one-dimensional creep deformation formula considering the effects of stress history is developed with the instant normal compression line of time-dependent UH model as the reference line.The one-dimensional compression creep formula is established.Referring to the calculation idea of layered summation method,an algorithm for predicting creep settlement of high fill foundation is developed based on creep formula.The algorithm contains three parameters that can be determined by measured settlement data.The accuracy and effectiveness of the prediction algorithm are verified by the foundation settlement monitoring data of three h igh fill projects.It is compared with three commonly used settlement prediction algorithms in geotechnical engineering.The verification and comparison results show that the prediction algorithm can accurately predict the creep settlement of high fill foundation.