考虑颗粒破碎影响的土石混合体二元介质理论模型  

Theoretical model of binary medium for soil-rock mixture considering influence of particle breakage

作　　者：周中[1] 丁昊晖 高文渊 Zhou Zhong;Ding Haohui;Gao Wenyuan(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《东南大学学报（自然科学版）》2021年第4期596-602,共7页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(50908234);湖南省自然科学基金资助项目(2020JJ4743).

摘　　要：为研究具有颗粒二相性的土石混合体受力特征,利用破损力学中的二元介质模型理论,基于物理电学中电阻串并联的概念,推导出考虑颗粒破碎影响的土石混合体串并联混合受力二元介质理论模型,并采用室内三轴压缩试验对该二元介质模型进行了验证.结果表明,在同一应变条件下,串联受力模型计算应力值为下限,平均相对误差最大值为30.44%;并联受力模型计算应力值为上限,平均相对误差最大值为40.61%;串并联混合受力模型计算应力值介于串联和并联模型之间,平均相对误差最大值仅为9.95%.考虑颗粒破碎影响时,串并联混合受力模型计算应力值的平均相对误差最大值低至7.63%,基本符合土石混合体的受力特性.To study the mechanical characteristics of soil-rock mixture with particle duality,based on the concept of resistance series-parallel in physical electricity,a theoretical model of binary medium for soil-rock mixture with series-parallel mixed forces considering the influence of particle breakage was derived by the theory of binary medium model in damage mechanics.The indoor triaxial compression test was carried out to verify the binary medium model.The results show that under the same strain condition,the stress calculated by the series forced model is the lower limit,and the maximum average relative error is 30.44%.The stress calculated by the parallel forced model is the upper limit,and the maximum average relative error is 40.61%.The stress calculated by the series-parallel mixed forced model is between these two values,and the maximum average relative error is only 9.95%.Considering the influence of particle breakage,the maximum average relative error of the stress calculated by the series-parallel hybrid forced model is 7.63%,thus conforming to the mechanical characteristics of soil-rock mixture.

关 键 词：土石混合体 颗粒破碎 串并联 二元介质模型 

分 类 号：TU43[建筑科学—岩土工程]