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清华大学学报(自然科学版)  2022, Vol. 62 Issue (2): 339-346    DOI: 10.16511/j.cnki.qhdxxb.2021.21.019
  土木工程 本期目录 | 过刊浏览 | 高级检索 |
堆石混凝土单轴受压力学性能
王辉1, 马嘉均1, 周虎2, 何世钦1, 金峰2
1. 北方工业大学 土木工程学院, 北京 100144;
2. 清华大学 水沙科学与水利水电工程国家重点实验室, 北京 100084
Mechanical behavior of rock-filled concrete with uniaxial compression
WANG Hui1, MA Jiajun1, ZHOU Hu2, HE Shiqin1, JIN Feng2
1. School of Civil Engineering, North China University of Technology, Beijing 100144, China;
2. State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
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摘要 该文进行了堆石混凝土(RFC)和自密实混凝土(SCC)试件单轴受压试验,得到了完整的应力-应变全曲线,对比分析了2种混凝土试件的破坏形态、峰值应力、峰值点应变、弹性模量及全曲线特征,给出了相应的应力-应变全曲线方程。结果表明,RFC破坏界面不仅存在堆石骨料与SCC基体之间的界面,而且存在堆石骨料自身的破裂面。在破坏后期,由于堆石骨架的作用,RFC试件的应力-应变全曲线下降段较为平缓。与SCC试件相比,RFC试件的平均峰值应力和峰值点应变分别降低了29%和51%,平均弹性模量增大了42%。RFC试件中堆石骨料的形状、摆放位置及堆石骨料与SCC基体之间的粘结都影响其力学性能,使得RFC试件试验结果离散大。由方程得出的RFC与SCC的理论应力-应变全曲线与试验全曲线吻合较好。
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王辉
马嘉均
周虎
何世钦
金峰
关键词 堆石混凝土(RFC)自密实混凝土(SCC)单轴受压应力-应变全曲线本构关系    
Abstract:Uniaxial compression tests of rock-filled concrete (RFC) and self-compacting concrete (SCC) were used to measure the complete stress-strain curves for these samples. The results showed the failure modes, peak stresses, peak point strains, elastic moduli and full stress-strain curves of the rock-filled concrete and self-compacting concrete. The results show that the failure interface of the rock-filled concrete is not only the interface between the rockfill aggregate and the self-compacting concrete matrix, but also the fracture surface in the rockfill aggregate itself. During later failure stages, the rockfill structure reduces the slope of the falling section of the stress-strain curve for the rock-filled concrete specimen. The average peak stress of the rock-filled concrete was 29% less than for the self-compacting concrete, the peak strain was 51% less, and the average elastic modulus was 42% more. The shape and position of the rockfill aggregate and the bond between the rockfill aggregate and the self-compacting concrete all affect the mechanical properties of the rock-filled concrete, which makes the test results show the characteristics of large dispersion. The theoretical stress-strain curves for the rock-filled concrete and the self-compacting concrete agree well with the measured curves.
Key wordsrock-filled concrete (RFC)    self-compacting concrete (SCC)    uniaxial compression    stress-strain curves    constitutive relation
收稿日期: 2021-02-05      出版日期: 2022-01-22
基金资助:北京市属高校基本科研项目(110052971921/059);清华大学水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2018-C-05)
通讯作者: 周虎,高级工程师,E-mail:zhouhut@tsinghua.edu.cn      E-mail: zhouhut@tsinghua.edu.cn
作者简介: 王辉(1975-),男,副教授
引用本文:   
王辉, 马嘉均, 周虎, 何世钦, 金峰. 堆石混凝土单轴受压力学性能[J]. 清华大学学报(自然科学版), 2022, 62(2): 339-346.
WANG Hui, MA Jiajun, ZHOU Hu, HE Shiqin, JIN Feng. Mechanical behavior of rock-filled concrete with uniaxial compression. Journal of Tsinghua University(Science and Technology), 2022, 62(2): 339-346.
链接本文:  
http://jst.tsinghuajournals.com/CN/10.16511/j.cnki.qhdxxb.2021.21.019  或          http://jst.tsinghuajournals.com/CN/Y2022/V62/I2/339
  
  
  
  
  
  
  
  
  
  
  
  
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