摘要
堆石料作为主要筑坝材料,具有显著的尺寸效应且易发生颗粒破碎,颗粒破碎是引起土石坝变形的重要影响因素之一。因此,研究堆石颗粒单粒破碎强度的尺寸效应可为高土石坝变形控制研究提供试验参数,具有重大意义。通过对20 mm^240 mm范围内的大连石灰石颗粒进行单颗粒强度室内试验,分析了不同粒径颗粒强度的分布规律,发现Logistic函数能够较好地描述同一粒组堆石颗粒强度的分布。基于Logistic函数建立了考虑尺寸效应的颗粒强度公式,同时根据单颗粒破碎试验现象提出了四种颗粒破碎模式。最后对单颗粒破碎后的碎片进行筛分,研究了其碎片的分布规律。
As the main material for dam construction, rockfill has obvious size effects and is prone to occur particle breakage, and particle breakage is one of the important influencing factors of the deformation of earth-rock DAMS. Hence, the study about size effects of single crushing strength of rockfill particles is significant for providing experimental data for deformation control of high dams. Dalian limestone particles within the range of 20-240 mm were tested for single particle strength laboratory test, and the distribution law of particle strength with different particle sizes was analyzed, the Logistic function could describe the distribution law of particle strength well. Based on Logistic function, the formula of particle strength considering size effects was established, and four kinds of particle failure models were proposed according to the phenomenon of single particle breakage. In the end, the granular fragment was screened and its distribution was studied.
作者
米晓飞
迟世春
MI Xiaofes;CHI Shichun(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian,Liaoning 116024 ,China;Institute of Earthquake Engineering,Faculty of Infrastructure Engineering,Dalian University of Technology,Dalian,Liaoning 11624 ,China)
出处
《水利与建筑工程学报》
2019年第4期182-187,197,共7页
Journal of Water Resources and Architectural Engineering
基金
国家重点研发计划(2016YFB0201001)
