应变率及节理倾角对岩石模拟材料动力特性的影响

李祥龙; 王建国; 张智宇; 黄永辉

doi:10.11883/1001-1455(2016)04-0483-08

应变率及节理倾角对岩石模拟材料动力特性的影响

doi: 10.11883/1001-1455(2016)04-0483-08

1.
昆明理工大学国土资源工程学院，云南昆明 650093
2.
云南农业大学建筑工程学院，云南昆明 650201
3.
昆明理工大学电力工程学院，云南昆明 650500

基金项目:

国家自然科学基金项目 51304087

云南省基金项目 KKSY201404056

爆炸科学与技术国家重点实验室开发基金项目 KFJJ15-14M

详细信息

作者简介:
李祥龙(1981—)，男，博士，副教授，lxl00014002@163.com

中图分类号: O347.3
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- 被引次数: 0
出版历程
- 收稿日期: 2015-06-09
- 修回日期: 2015-08-13
- 刊出日期: 2016-07-25

Experimental study for effects of strain rates and joint angles on dynamic responses of simulated rock materials

1.
Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China
2.
College of Civil and Architectural Engineering, Yunnan Agricultural University, Kunming 650201, Yunnan, China
3.
Faculty of Electric Power Engineering, Kunming University of Science and Technology, Kunming 650500, Yunnan, China

摘要

摘要: 采用相似材料模拟实验方法并借助SHPB(split Hopkinson pressure bar)实验系统，探究应变率及节理倾角对节理岩石动态力学性状的影响，包括应力应变曲线特征、破坏模式、能量传递及耗散规律。该实验结果表明：应变率升高，动态弹性模量增大，试件破碎块度变小，完整试件裂纹缺陷沿着平行于压应力方向扩展；节理角度越大，峰值强度越低，但当应变率升高到一定程度，节理角度对岩石破坏形态的影响不再明显；不同试件的入射能、反射能、透射能和耗散能均随应变率升高呈非线性增加，含倾斜角度节理试件的能量耗散率随应变率的变化幅度明显大于完整试件。
- 固体力学 /
- 动力响应 /
- SHPB /
- 节理岩石 /
- 节理倾角 /
- 应变率 /
- 耗散能
Abstract: By using a split Hopkinson pressure bar (SHPB) technique, impact experiments were carried out on the jointed rock specimens simulated by cement-based mortar specimens. The dynamic responses of the simulated jointed rock material with different joint angles at different strain rates were analyzed including stress-strain curve characteristics, failure modes, energy transmission and dissipation. The experimental results show that, with the increase of strain rate, the dynamic elastic moduli increase, and the specimens become more fragile. The peak intensity decreases with the increase of the joint angles whereas when the strain rate increases to a certain extent, the influence of the joint angles on the rock damage formation is no longer obvious. The incident energy, the reflective energy, the transmission energy, and the dissipation energy of the different specimens nonlinearly increase with the increase of the strain rate. The energy dissipation rates of the specimens with inclination joint angles are higher than those of the intact specimens with the increase of the strain rate.
- solid mechanics /
- dynamic response /
- SHPB /
- jointed rock /
- joint angle /
- strain rate /
- dissipation energy

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图 1 不同应变率下完整试件的动态应力应变曲线

Figure 1. Dynamic stress-strain curves of intact specimens at different strain rates

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图 2 不同应变率下完整试件的破坏形态

Figure 2. Failure patterns of intact specimens at different strain rates

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图 3 不同应变率下15°节理试件的动态应力应变曲线

Figure 3. Dynamic stress-strain curves of 15° jointed specimens at different strain rates

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图 4 不同应变率下15°节理试件的破坏形态

Figure 4. Failure patterns of 15° jointed specimens at different strain rates

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图 5 不同应变率下30°节理试件的动态应力应变曲线

Figure 5. Dynamic stress-strain curves of 30° jointed specimens at different strain rates

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图 6 不同应变率下30°节理试件的破坏形态

Figure 6. Failure patterns of 30° jointed specimens at different strain rates

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图 7 完整试件能量随应变率的变化曲线

Figure 7. Energy-strain rate curves of intact specimens

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图 8 15°节理试件能量随应变率的变化曲线

Figure 8. Energy-strain rate curves of 15° jointed specimens

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图 9 30°节理试件能量随应变率的变化曲线

Figure 9. Energy-strain rate curves of 30° jointed specimens

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图 10 能量耗散率与应变率的关系曲线

Figure 10. Energy dissipation rate varying with strain rate

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表 1 不同撞击条件下试件几何参数

Table 1. Geometry parameters of specimens under different impact conditions

N	p/MPa	v/(m·s^-1)	D/mm	l/mm	β/(°)	n	贯通程度
X7	0.55	3.283	48.20	100.51			完整
X6	0.55	3.903	48.63	100.22			完整
X4	0.58	4.867	48.53	99.85			完整
X11	0.58	5.023	48.25	100.06			完整
X3	0.60	5.445	48.46	99.91			完整
X5	0.60	5.993	48.73	100.13			完整
B10	0.54	2.510	48.61	100.41	15	1	径向贯通
B12	0.55	3.356	48.61	100.40	15	1	径向贯通
B4	0.55	3.794	48.68	100.33	15	1	径向贯通
B13	0.55	4.082	49.66	100.21	15	1	径向贯通
B5	0.58	5.082	48.75	100.73	15	1	径向贯通
B6	0.60	6.004	48.55	100.51	15	1	径向贯通
C11	0.55	3.563	48.48	101.89	30	1	径向贯通
C4	0.55	3.913	48.73	99.98	30	1	径向贯通
C1	0.55	4.167	48.67	101.39	30	1	径向贯通
C5	0.58	5.116	50.12	99.81	30	1	径向贯通
C6	0.60	5.581	48.74	101.41	30	1	径向贯通
C3	0.60	5.699	49.64	100.91	30	1	径向贯通

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表 2 SHPB动态冲击下不同试件的能量分布

Table 2. Energy distribution of different specimens subjected to SHPB dynamic impact

N	v/(m·s^-1)	/s^-1	E_i/J	E_r/J	E_t/J	E_d/J	E_d/E_i
X7	3.283	28.12	55.67	22.74	14.49	18.45	0.331 4
X6	3.903	31.76	81.57	22.38	34.53	24.66	0.302 3
X4	4.867	38.59	119.16	40.23	34.17	44.76	0.375 6
X11	5.023	39.73	133.50	63.58	24.65	45.27	0.339 1
X3	5.445	45.39	158.32	72.45	30.49	55.38	0.349 8
X5	5.993	54.94	189.25	100.90	26.25	62.10	0.328 1
B10	2.510	20.07	29.57	21.15	2.40	6.02	0.203 6
B12	3.356	25.17	55.72	32.23	8.55	14.95	0.268 3
B4	3.794	32.28	71.95	51.08	3.82	17.05	0.237 0
B13	4.082	35.71	80.92	38.58	9.48	32.86	0.406 1
B5	5.082	44.67	136.01	77.57	7.25	51.19	0.376 4
B6	6.004	47.16	186.31	88.15	15.01	83.16	0.446 4
C11	3.563	30.12	67.56	45.77	4.74	17.05	0.252 4
C4	3.913	33.78	74.81	58.23	1.64	14.93	0.199 6
C1	4.167	37.26	85.59	40.69	7.08	37.82	0.441 9
C5	5.116	42.34	134.49	58.05	23.26	53.18	0.395 4
C6	5.581	50.85	161.88	117.04	7.23	37.62	0.232 4
C3	5.699	52.79	163.74	85.63	9.31	68.81	0.420 2

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