早龄期混凝土-泥岩组合体的冲击动力学特性及损伤特征

潘冲; 谢全民; 孙金山; 周辉; 庞朝来; 马俊

doi:10.11858/gywlxb.20251094

早龄期混凝土-泥岩组合体的冲击动力学特性及损伤特征

doi: 10.11858/gywlxb.20251094

潘冲^1,,
谢全民^1,*, ,,
孙金山¹,
周辉¹,
庞朝来²,
马俊¹

1.
江汉大学精细爆破全国重点实验室, 湖北武汉　430056
2.
中铁十二局集团有限公司第二工程有限公司, 山西太原　030032

基金项目: 国家自然科学基金（52378399）；国家重点研发计划（2021-008）；湖北省中央引导地方科技发展专项（2024CSA094）；精细爆破全国重点实验室博士启动基金（PBSKL-2022-QD-03）

详细信息

作者简介:
潘　冲（2001－），男，硕士研究生，主要从事复合体冲击动力学研究. E-mail：pc20010610@163.com

通讯作者:
谢全民（1983－），男，博士，副教授，主要从事爆破工程研究. E-mail：xqmblast@jhun.edu.cn

中图分类号: O347.1; O521.9; TU45
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出版历程
- 收稿日期: 2025-05-19
- 修回日期: 2025-06-13
- 网络出版日期: 2025-06-19
- 刊出日期: 2025-12-05

Impact Dynamic Characteristics and Damage Features of Early-Age Concrete-Mudstone Composite

1.
State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, Hubei, China
2.
China Railway 12th Bureau Group Second Engineering Co., Ltd., Taiyuan 030032, Shanxi, China

摘要

摘要: 为研究冲击荷载作用下早龄期混凝土-泥岩组合体的动态力学特性，采用分离式霍普金森压杆装置，结合高速摄影机，对养护龄期为1、3、7 d的组合体试件进行了冲击试验，基于数字图像相关（digital image correlation，DIC）技术分析了试件的位移场和应变场的演化规律，系统揭示了组合体的动态损伤破坏特征。试验结果表明：随着应变率增大，不同龄期组合体试件呈现显著的应变率相关性，其动态强度增长规律符合对数函数模型；耗能密度随入射能线性增长；1、3、7 d龄期组合体表面的最大位移分别为1.564、1.196、0.924 mm，最大应变分别为1.886%、1.352%、1.184%。研究结果揭示了早龄期混凝土-泥岩组合体在冲击荷载作用下的动态力学性能及损伤破坏机制，为隧道爆破施工中围岩-初期支护结构的损伤防控提供了理论依据。
- 混凝土-泥岩组合体 /
- 早龄期 /
- 分离式霍普金森压杆 /
- 动力学特性 /
- 耗能密度 /
- 数字图像相关
Abstract: To investigate the dynamic mechanical properties of early-age concrete-mudstone composites under impact loading, split Hopkinson pressure bar (SHPB) tests integrated with a high-speed camera were conducted on composite specimens with curing ages of 1, 3, and 7 d. Digital image correlation (DIC) technology was employed to analyze the evolution of displacement and strain fields, systematically revealing the dynamic damage and failure characteristics of the composites. The test results indicate that as the strain rate increases, the composite specimens exhibit significant strain rate dependence across all curing ages, and their dynamic strength growth follows a logarithmic function model. The energy dissipation density increases linearly with incident energy. DIC measurements show that the maximum surface displacements of the 1, 3, and 7 d specimens are 1.564, 1.196, and 0.924 mm, respectively, with corresponding maximum strains of 1.886%, 1.352%, and 1.184%. This study elucidates the dynamic mechanical behavior and damage-failure mechanisms of early-age concrete-mudstone composites under impact loading, providing a theoretical foundation for damage prevention and control in surrounding rock-initial support structures during tunnel blasting construction.
- concrete-mudstone composite /
- early-age /
- split Hopkinson pressure bar (SHPB) /
- dynamic mechanical properties /
- dissipated energy density /
- digital image correlation

HTML全文

图 1 早龄期混凝土-泥岩组合体试件制备流程

Figure 1. Preparation process of early-age concrete-mudstone composite specimens

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图 2 不同龄期组合体的应力-应变关系

Figure 2. Stress-strain relationship of composites at different ages

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图 3 组合体试件的应力平衡校验

Figure 3. Stress balance check of composite specimen

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图 4 1、3、7 d龄期组合体的应力-应变曲线

Figure 4. Stress-strain curves of composites at 1, 3 and 7 d ages

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图 5 3 d龄期组合体的冲击破坏形态

Figure 5. Impact failure patterns of composites at 3 d age

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图 6 动态强化因子-应变率拟合曲线

Figure 6. Fitting curves of dynamic increase factor versus strain rate

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图 7 1 d龄期组合体的能量演化

Figure 7. Energy evolution of the composite at 1 d ages

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图 8 耗能密度随入射能变化曲线

Figure 8. Variations of dissipated energy density with incident energy

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图 9 0.4 MPa下组合体的冲击破坏过程

Figure 9. Impact failure process of the composite under 0.4 MPa

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图 10 0.4 MPa下组合体的位移场变化云图

Figure 10. Displacement field contour of the composite under 0.4 MPa

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图 11 0.4 MPa下组合体的应变场变化云图

Figure 11. Strain field contour of the composite under 0.4 MPa

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表 1 早龄期混凝土-泥岩组合体的动态力学参数

Table 1. Dynamic mechanical parameters of early-age concrete-mudstone composite

T/d	p_i/MPa	v_i/(m·s⁻¹)	Strain rate/s⁻¹	σ_p/MPa	DIF
1	0.1	2.536	18.02	7.66
	0.2	3.498	28.74	12.60	1.165
	0.3	4.523	38.44	17.39	1.607
	0.4	5.564	48.21	27.51	2.543
3	0.1	2.856	18.46	9.89
	0.2	3.832	28.44	14.86	1.138
	0.3	4.812	38.55	24.43	1.871
	0.4	5.848	48.07	39.64	3.035
7	0.1	3.281	18.66	17.46
	0.2	4.172	28.10	22.44	1.440
	0.3	5.322	38.06	32.53	2.088
	0.4	6.187	48.19	53.90	3.459

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表 2 3种龄期组合体的冲击能量计算结果

Table 2. Impact energy calculation results for composites at three ages

T/d	Strain rate/s⁻¹	W_I/J	W_R/J	W_T/J	W_S/J	Energy consumption density/(J·cm⁻³)
1	18.02	65.69	30.08	16.36	18.25	0.027
	28.74	102.03	57.09	19.70	25.24	0.040
	38.44	148.62	88.17	29.01	31.44	0.050
	48.21	212.49	120.53	42.37	49.59	0.079
3	18.46	77.99	41.27	15.89	20.83	0.033
	28.44	132.50	67.33	30.49	34.68	0.055
	38.55	209.38	106.89	40.96	61.53	0.098
	48.07	268.63	131.63	56.12	80.88	0.128
7	18.66	129.25	66.40	22.24	40.61	0.065
	28.10	188.71	94.34	39.21	55.16	0.088
	38.06	293.65	142.59	52.52	98.54	0.157
	48.19	372.55	173.56	68.95	120.04	0.207

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