基于模拟退火的路基土动态回弹模量建模研究

针对湖南省西部山区某高速公路路基土,开展了一系列动态回弹模量试验,分析了应力状态对动态回弹模量的影响规律,提出了基于模拟退火进行回弹模量预估模型参数全局化搜索的方法,开发了相关建模程序,并与常规等效线性法建模的进行了对比。研究结果表明,围压和偏应力均对路基土的动态回弹模量均有显著影响,利用开发的模拟退火参数搜索程序,可以实现各种回弹模量模型的参数搜索,有助于克服等效线性法的缺点,能更便捷、准确地建立回弹模量预估模型。

Study on Modelling of Dynamic Resilience Modulus of Subgrade Soil Based on the Simulated Annealing

A series of dynamic resilience modulus tests was carried out on expressway subgrade in western Hunan.The influence of stress state on dynamic resilience modulus was analyzed.Based on simulated annealing,a global searching method for parameters of resilience modulus prediction model was proposed,and related modeling program was developed.The modeling effect was compared with that of conventional equivalent linear method.The results show that both the confining pressure and deviatoric stress have significant effects on resilience modulus of the subgrade soil.With the developed simulated annealing program,the parameter searching of various resilience modulus models can be realized.Simulated annealing program can help to overcome the shortcomings of the equivalent linear method,and establish the prediction model of resilience modulus more conveniently and accurately.