颗粒形状对粒状材料破碎演化规律及强度准则影响  

Influence of particle shape on the particle crushing law and strength criterion for granular materials

作　　者：郅彬[1] 王小婵 刘恩龙[2,3] ZHI Bin;WANG Xiao-chan;LIU En-long(School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an,Shaanxi 710000,China;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu,Sichuan 610065,China;College of water Resources and Hydropower,Sichuan University,Chengdu,Sichuan 610065,China)

机构地区：[1]西安科技大学建筑与土木工程学院,陕西西安710000 [2]四川大学水力学与山区河流开发保护国家重点实验室,四川成都610065 [3]四川大学水利水电学院,四川成都610065

出　　处：《岩土力学》2023年第3期649-662,833,共15页Rock and Soil Mechanics

基　　金：西安市岩土与地下工程重点实验室开放基金(No.XKLGUEKF21-03)。

摘　　要：为探讨颗粒形状对粒状材料的颗粒破碎演化规律及强度特征的影响,提出了一个新的粒状材料颗粒形状量化参数,设计了一种考虑三维颗粒形状的人工试样制备方法,随即进行了常规三轴压缩试验,并分析了颗粒破碎和强度特征,最终建立了一个二元介质强度准则,具体的研究成果为:建立颗粒形状量化参数——球形模量G_(M),在此基础上制备了5种不同形状的可破碎粒状材料三轴试样,并发现球形模量影响着粒状材料的三轴压缩强度特征;通过筛分确定试样的颗粒破碎情况,对试样的颗粒破碎演化规律和临界状态进行探讨,发现颗粒形状通过影响颗粒破碎规律而控制着宏观强度的非线性演化特征;以二元介质理论为基础,建立了考虑颗粒形状的可破碎粒状材料强度准则,并通过试验对其适用性进行了验证。In order to explore the influence of particle shape on the particle fragmentation and strength characteristics of granular materials,this paper proposes a new parameter to quantify the particle shape of granular materials,designs an artificial sample preparation method considering the three-dimensional particle shape feature information,then conducts a conventional triaxial compression test for these prepared samples,and analyzes the particle local breakage law and strength characteristics,finally derives a binary medium strength criterion.Some research results are drawn as follow.Quantitative parameter of particle shape—spherical modulus G_(M) is proposed.On this basis,five different shapes of triaxial specimens of crushable granular materials were prepared,and it is found that the spherical modulus affects the triaxial compressive strength characteristics of granular materials.The particle breakage of the sample is determined by sieving method,and the evolution law and critical state of the sample particle breakage is discussed,and particle shape is found to control the nonlinear evolutionary characteristics of macroscopic strength by influencing the particle fragmentation pattern.Based on the binary medium theory,the strength criterion of crushable granular materials considering the particle shape is established,and its applicability is verified by experiments results from conventional triaxial condition.

关 键 词：颗粒形状 颗粒破碎 临界状态 二元介质模型 强度准则 

分 类 号：TU451[建筑科学—岩土工程]