基于宏观实验数据的堆石料细观本构模型参数反演  

Meso-parameter Inversion of Constitutive Model for Rockfill Materials Based on Macro Experimental Data

作　　者：李守巨[1] 李德[1] 于申[1] 

机构地区：[1]大连理工大学工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《山东科技大学学报（自然科学版）》2015年第5期20-26,共7页Journal of Shandong University of Science and Technology(Natural Science)

基　　金：国家重点基础研究发展计划("973"计划)项目(2015CB057804);国家自然科学基金项目(51105048;51209028);工业装备结构分析国家重点实验室开放基金项目(S14206)

摘　　要：如何精确估计岩石材料细观本构模型参数是制约离散元方法发展与应用的瓶颈之一。提出基于响应面法的堆石料细观本构模型参数反演方法。建立一种用于岩石细观本构模型参数反演的响应面函数形式,在宏观实验数据与细观模型参数之间建立桥梁,实现岩石试样变形与模型参数之间关系的高精度非线性映射。基于堆石料试样的宏观实验数据和响应面函数模型,将模型参数反演问题转化为优化问题处理,反演确定岩石材料细观本构模型参数。结果表明:堆石料细观本构模型参数,包括法向接触刚度、切向接触刚度及摩擦系数,随围压增加而稍有增加;材料的法向接触刚度与切向接触刚度近似相等。反演分析预测的偏应力-轴向应变曲线与试验曲线吻合较好,实验验证了所提出反演方法的有效性。How to precisely determine the meso-parameters of constitutive model for rock materials has become a key problem affecting the development and practical applications of discrete element methods.This paper proposed a meso-parameter inversion method of constitutive model for rockfill materials based on response surface methodology.The response surface function was set up to achieve the high precision nonlinear mapping between the deformation data of rock specimen and the meso-parameters of constitutive model for rock materials by bridging the macro experimental data and the model meso-parameters.Based on the macro experimental data and the response surface function model,the meso-parameters of constitutive model for rockfill materials were determined by turning the inversion into optimization algorithm.The results show that the meso-parameters of constitutive model for rockfill materials,including normal contact stiffness,tangent contact stiffness and friction coefficient,increase slightly as the confining pressure rises,and that the normal contact stiffness and the tangent contact stiffness are approximately the same.With a good agreement between the predicted and experimental deviatoric stress-axial strain curves,the effectiveness of the proposed inversion method is validated by experimental data.

关 键 词：参数反演 颗粒流 离散元法 响应面方法 优化算法 堆石料 本构模型 

分 类 号：TU443[建筑科学—岩土工程]