堆石料剪切强度与变形的尺寸效应模拟  

Numerical simulation of size effect on shear strength and deformation behavior of rockfill materials

作　　者：邵晓泉 迟世春[1,2] 陶勇 SHAO Xiao-quan;CHI Shi-chun;TAO Yong(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;Institute of Earthquake Engineering,School of Hydraulic Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,China;Shanghai Waterway Engineering Design and Consulting Co.,Ltd.,Shanghai 200120,China)

机构地区：[1]大连理工大学海岸与近海工程国家重点实验室,辽宁大连116024 [2]大连理工大学建设工程学部水利工程学院工程抗震研究所,辽宁大连116024 [3]中交上海航道勘察设计研究院有限公司,上海200120

出　　处：《岩土工程学报》2018年第10期1766-1772,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(51379029);国家重点研发计划项目(2016YFB0201001)

摘　　要：堆石料尺寸效应的研究对准确预测土石坝的强度与变形至关重要。但是受室内试验条件的限制,能反映原型足尺级配料试样特征的三轴试验难以开展。通过对10~40 mm粒径范围内的古水玄武岩颗粒进行单粒强度试验,分析了单粒强度的尺寸效应,采用离散元方法对室内三轴试验的强度和变形进行模拟,结果表明采用的模拟方法可以很好地重现室内缩尺级配料的特性。运用相似级配法将模拟的缩尺级配扩展到原型足尺级配料级配,对原型足尺级配料试样的偏应力、体变和轴向应变关系进行模拟预测,同时整理了不同尺寸试样的强度参数。研究成果为由室内缩尺试验参数推演原型足尺级配料试样的强度及变形参数提供了一种可能。The scale effect of rockfill materials is crucial to predicting the strength and deformation of earth-rockfill dams. Due to their large particle size and the experimental restrictions, large triaxial tests on full scale samples are seldom conducted. The size effect coefficient for single particle ranging from 10 to 40 mm in diameter is measured by single particle crushing tests. The discrete element method is adopted here, and the results show that this method can reproduce the strength and deformation of dam rockfill materials with scaled gradation well. The grain size distribution of the prototype samples is parallel to the scaled one, and the large samples are simulated. The strength parameters of samples with different sizes are studied. This work may offer a possible way to get the strength and deformation parameters for prototype samples from the laboratory results.

关 键 词：堆石料 三轴剪切试验 单粒强度 尺寸效应 

分 类 号：TU413[建筑科学—岩土工程]