冲击荷载作用下分层充填体能量演化与破坏模式分析

doi:10.11896/cldb.22030169

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Abstract The essence of backfill failure is energy absorption and dissipation. In order to obtain the energy evolution and failure mode of layered backfill under impact load, a 50 mm Hopkinson pressure bar test system was used to study the influence of different strain rates and interlayer mass concentrations on the dynamic characteristics, energy evolution and failure mode of layered backfill. The results show that the dynamic peak strength of layered backfill increases with the increase of average strain rate, and the energy values of backfill are positively correlated with ave-rage strain rate. With the increase of the average mass concentration of layered backfill, the transmission energy of backfill decreases and the absorption energy increases, and the change of the mass concentration of intermediate layered backfill has a great influence on the dynamic peak strength and energy evolution law of backfill. According to LS-DYNA numerical simulation and experimental results, the failure of layered backfill mainly occurs in the backfill layer with low concentration, and it is easy to fracture along the layered backfill layer. The research results can provide theoretical basis for the strength value design of underground layered backfill.

Key words： layered backfill dynamic peak strength dynamic strength growth factor failure mode energy dissipation

Published: 25 October 2023 Online: 2023-10-19

CLC number:

TD853

Fund:National Natural Science Foundation of China (51964023), Yunnan Major Scientific and Technological Projects (202202AG050014), Yunnan Fundamental Research Projects (202101BE070001-038, 202201AT070146), the National Key Research and Development Program of China (2019YFC1904202), the Yunnan Innovation Team Funding Project (202105AE160023), and the Yunnan Department of Education Science Research Fund Project(2022J0055).

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	Articles by authors
	LI Jinxin
	SUN Wei
	LI Zhaoyu
	CHEN Chong
	LIU Zeng
	JIANG Minggui
	FAN Kai

Cite this article:

LI Jinxin,SUN Wei,LI Zhaoyu, et al. Analysis of Energy Evolution and Failure Mode of Layered Backfill Under Impact Load[J]. Materials Reports, 2023, 37(20): 22030169-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22030169 OR http://www.mater-rep.com/EN/Y2023/V37/I20/22030169

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