动/静荷载作用纤维-矿粉-聚苯乙烯混凝土吸能特征研究

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Abstract Underground space engineering often suffers from deformation and failure after dynamic load, and the damage degree can be reduced by absorbing dynamic energy by protective structure. However, the energy-absorbing concrete material which can effectively absorb impact energy and its mechanical properties are still unclear. Based on the central optimal combination principle of response surface method, the dyna-mic/static load combined synchronous acoustic emission (AE) monitoring test method was adopted, and the deformation energy encroachment process of concrete affected by key factors of expanded polystyrene foam (EPS), slag powder (SP) and basalt fiber (BF) and cement matrix was studied by means of high-precision scanning electron microscope(SEM). The results show that EPS particles change the distribution of pore structure of concrete, and the failure mode of BF-SP-EPS concrete under dynamic and static load changes from brittle failure to ductile failure, showing the characteristics of crushing compaction and energy dissipation, greatly improving the deformation toughness and providing effective deformation space for absorbed energy; the bridge effect of BF-SP-EPS and cement matrix can significantly improve the energy absorption performance of concrete. Compared with the same kind of concrete without admixture, the absorbed energy reaches 71J, and the impact energy absorption increases by 50%; the craving function optimization model is established, and the optimal BF-SP-EPS ratios with the compression resis-tance and absorbed energy as the response target are 33.7vol%, 17wt% and 0.13vol%. The correctness of the optimal ratio is verified by the same condition test method. The research results provide a strong theoretical basis for the energy absorption protection safety of underground space engineering structures.

Key words： dynamic/static load response surface method BF-SP-EPS concrete mechanics law deformation and failure characteristics absorbed energy

Published: 09 December 2021

CLC number:

TU528

Fund:This work was financially supported by Beijing Dutstanding Talent Training Foundation (2017000021223ZK04), Fundamental Research Funds for the Central Universities (FRF-TP-19-009B1).

About author:: Zeming Yu, Shandong Province in November 1997, is now a master's student in School of Civil and Resource Engineering, University of Science and Technology Beijing. Under the guidance of Professor Lyu Xiangfeng, he studied the mechanics and protection of underground engineering disasters.
Xiangfeng Lyu, Hebei Province in October 1982, Ph.D. in engineering, professor and doctoral supervisor of University of Science and Technology Beijing, mainly engaged in teaching and scientific research on safety control of underground space engineering construction and service. He has presided over and completed 25 national, provincial and ministerial-level and enterprise key scientific and technological research projects, such as the National Natural Science Foundation Project, the special project of local science and technology development guided by the central government, the Fundamental Research Funds for the Central Universities, and the special project of Beijing science and technology, which have remarkable social and economic benefits. The first completed person presided over the research results and won one second prize of Science and Technology Progress Award of the Ministry of Education, one third prize of Beijing Technology Invention Award, three first prizes of provincial and ministerial level science and technology awards, and two invention gold awards; Published 107 academic papers; Authorized 52 national patents, applied for 3 PCT patents and 12 soft works; Prepare 4 standards; Published 5 academic monographs. He has been selected into the Beijing Science and Technology Rising Star Program, Beijing Excellent Young Talents, Beijing Top Young Talents of “High Innovation Program” and Beijing Million Talents Project, and won the Youth Award of Soil Mechanics and Geotechnical Engineering in Mao Yisheng and Beijing Youth Science and Technology Award in Mao Yisheng.

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	YU Zeming
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	MA Rongping
	HU Xiaochen
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Cite this article:

YU Zeming,CHEN Yan,MA Rongping, et al. Study on Energy Absorption Characteristics of BF-SP-EPS Concrete Under Dynamic/Static Load[J]. Materials Reports, 2021, 35(z2): 669-677.

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http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/Iz2/669

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