堆石混凝土单轴受压力学性能

王辉; 马嘉均; 周虎; 何世钦; 金峰

doi:10.16511/j.cnki.qhdxxb.2021.21.019

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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

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

作者信息 +

Mechanical behavior of rock-filled concrete with uniaxial compression

WANG Hui¹, MA Jiajun¹, ZHOU Hu², HE Shiqin¹, JIN Feng²

Author information +

文章历史 +

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。

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.

导出引用

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 https://doi.org/10.16511/j.cnki.qhdxxb.2021.21.019

WANG Hui, MA Jiajun, ZHOU Hu, HE Shiqin, JIN Feng. Mechanical behavior of rock-filled concrete with uniaxial compression[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(2): 339-346 https://doi.org/10.16511/j.cnki.qhdxxb.2021.21.019

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基金

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）

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收稿日期	出版日期
2021-02-05	2022-02-15
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2022-01-22

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