冻结原状砂土分数阶Burgers蠕变模型  

FRACTIONAL DERIVATIVE BURGERS CREEP MODEL OF FROZEN UNDISTURBED SAND SOIL

作　　者：黄方勇 毛芬[2] 

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]安徽理工大学冻土研究所,安徽淮南232001

出　　处：《低温建筑技术》2015年第11期102-105,共4页Low Temperature Architecture Technology

基　　金：安徽省博士后基金项目:深部软岩蠕变机理粒子群分数阶导数模型

摘　　要：为了更好的描述人工冻结砂土的蠕变特性,在Burgers模型的基础上,将分数代数理论与Burgers模型相结合建立了分数阶导数Burgers蠕变模型,对内蒙古地区原状冻土在不同温度和不同加载应力下的单轴蠕变曲线进行模拟,模型参数均由遗传算法全局优化而得。通过对比Burgers模型模拟的结果可以看出分数阶导数Burgers模型能与试验数据严密相关,且所需参数较少,物理意义明确,说明了分数阶导数Burgers蠕变模型能够很好的反映人工冻结砂土的蠕变特性,具有更高的精确性。In order to describe the creep properties of artificial frozen sand soil better, based on the Burgers model, fractional derivative Burgers creep model is established by combining fractional algebraic theory and Burgers model, and the uniaxial creep curves of the undisturbed frozen soil in Inner Mongolia at different temperatures and different loading stress is stimulated, model parameters are derived by the global of genetic algorithm. By comparing the simulation results of Burgers model, we can see fractional derivative Burgers model can closely associated with the experimental data, in addition, it has definite physical meaning and few parameters need to be adjusted in the calculation process, it suggests that frac- tional derivative Burgers creep model can well reflect the creep properties of artificial frozen soil and with higher accuracy.

关 键 词：冻结砂土 BURGERS模型 蠕变 遗传算法 分数阶导数 

分 类 号：TU471.7[建筑科学—结构工程]