循环荷载作用下堆石料的颗粒破碎特性  

Particle breakage of rockfill materials under cyclic loadings

作　　者：韩华强[1,2] 陈生水 傅华[1,2] 郑澄锋 HAN Hua-qiang CHEN Sheng＇shui FU Hua ZHENG Cheng-feng(Nanjing Hydraulic Research Institute, Nanjing 210024, China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210024, China)

机构地区：[1]南京水利科学研究院,江苏南京210024 [2]水文水资源与水利工程国家重点实验室,江苏南京210024

出　　处：《岩土工程学报》2017年第10期1753-1760,共8页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金重大研究计划集成项目(91215301);国家自然科学基金重点项目(51539006);国家自然科学基金青年基金项目(51309161)

摘　　要：通过大型动力三轴试验,研究了循环荷载作用下堆石料的颗粒破碎特性及其影响因素,首次根据堆石颗粒在混合料中所发挥的作用以及堆石料发生颗粒破碎后不同粒径范围颗粒含量的变化量,将堆石料的颗粒破碎形式划分为棱角破碎和骨架破碎。进而,基于堆石料发生颗粒破碎前后级配的分形维数定义了堆石料的颗粒破碎率,建立了循环荷载作用下堆石料颗粒破碎率与其动剪应变及体积应变关系表达式。Through lab dynamic tri-axial tests on rockfill materials, the characteristics of particle breakage and its influence factors under cyclic loadings are studied. Considering the variable quantity of different ranges of particle size after grain crushing, the particle breakage form of rockfill is differentiated as angular crushing and skeleton crushing in view of the roles that the rockfill particles play in the mixture for the first time. Incorporation with the fractal theory, the broken rate of rockfill is defined as the variable of the fractal dimension of aggregate gradation, which can be obtained by the fractal dimension of aggregate gradation before and after particle breakage. Furthermore, the relationship among the broken rate, the shear strain and the dynamic volume change of rockfill materials is established.

关 键 词：堆石料 循环荷载 颗粒破碎率 影响因素 

分 类 号：TU411[建筑科学—岩土工程]