基于修正邓肯–张模型的堆石料颗粒破碎研究  

Research on particle breakage of rockfill material based on modified Duncan-Chang model

作　　者：李雪梅[1,2] 李红文[1,3] 郑敏生[1,2] 章晓桦[1,2] 

机构地区：[1]浙江省水利河口研究院,浙江杭州310020 [2]浙江省水利防灾减灾重点实验室,浙江杭州310020 [3]浙江广川工程咨询有限公司,浙江杭州310020

出　　处：《岩石力学与工程学报》2016年第A01期2695-2701,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：浙江省水利厅科技计划项目(RC1301);浙江省水利河口研究院院长基金项目(防灾重A12003)~~

摘　　要：堆石料在剪切过程中有明显的强度软化和剪胀现象,传统邓肯–张模型无法对其进行有效描述。通过对邓肯–张模型进行改进,能得到更好的拟合效果,并给出模型参数b-c=0.25作为材料处于硬化还是已进入软化阶段的判别标准。通过Hardin破损指标的引入,将颗粒破碎程度和材料强度和变形联系起来,分析结果表明,随着破碎程度增加,强度降低比较明显,而变形则主要受围压控制。基于改进邓肯–张模型给出剪胀率d与应力比η之间的关系,与已有理论的比较说明了其合理性和便利性。Rockfill material shows obvious strength softening and dilantancy during shearing process, which can not be described effectively by the classic Duncan-Chang model. The better fitting results can be achieved by introducing modified Duncan-Chang model. The equation b-c = 0.25 is given as judgment criterion of whether the material has softened or not. Particle breakage level is connected with material strength and deformation by introducing Hardin breakage index. The results show that with the breakage level increasing, the strength decreases obviously, while deformation mostly depends on confining pressure. Based on improved Duncan-Chang model, the relationship between dilatancy d and stress ratio η is given. Compared with existing theories, it shows more reasonable and convenient.

关 键 词：土力学 修正邓肯-张模型 堆石料 颗粒破碎 

分 类 号：TU43[建筑科学—岩土工程]