非饱和黏土平板撞击实验及状态方程的研究

丁育青; 汤文辉; 张若棋; 冉宪文; 张明建

doi:10.11858/gywlxb.2014.06.002

非饱和黏土平板撞击实验及状态方程的研究

doi: 10.11858/gywlxb.2014.06.002

丁育青^{1, 2,},
汤文辉^1,*, ,,
张若棋¹,
冉宪文¹,
张明建³

1.
国防科学技术大学理学院工程物理研究所，湖南长沙 410073
2.
第二炮兵装备研究院第二研究所, 北京 100085
3.
西南交通大学高压物理实验室，四川成都 610031

基金项目: 国家安全重大基础研究项目; 国家自然科学基金(11002162)

详细信息

作者简介:
丁育青(1985—), 男，博士，主要从事材料动态力学性能研究.E-mail:yqding_nudt@163.com

通讯作者:
汤文辉(1964—), 男，博士，教授，主要从事冲击波物理研究.E-mail:wenhuitang@163.com

中图分类号: O521.2; TU411.5
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出版历程
- 收稿日期: 2012-12-17
- 修回日期: 2013-03-06

Equation of State for Unsaturated Clay by Plate Impact Experiments

1.
Institute of Engineering Physics, College of Science, National University of Defense Technology, Changsha 410073, China
2.
The Second Institute of the Second Artillery Equiqment Academe, Beijing 100085
3.
Laboratory of High-Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 利用口径为24 mm的二级轻气炮实验装置，结合磁测速和光纤探针动态测试技术，分别对含水率为0、8%和15%的3种非饱和黏土试样进行了平板撞击实验，试样的压力峰值区间为1.29~32.54 GPa。实验结果表明，含水率对非饱和黏土的冲击压缩特性影响明显。当非饱和黏土受到冲击压缩时，孔隙被进一步压实，滞留在黏土孔隙中的水和空气来不及排出，从而与黏土中的固体颗粒一起，共同支配非饱和黏土的冲击压缩特性；而由于水的相对不可压缩性，导致黏土的可压缩性随着含水率的升高而下降。提出一种修正的三相混合物状态方程，对3种含水率试样的压力-密度曲线进行了拟合，结果表明，该状态方程能够较好地描述不同含水率非饱和黏土的压力-密度关系。
- 非饱和黏土 /
- 含水率 /
- 二级轻气炮 /
- 平板撞击实验 /
- 状态方程
Abstract: Using a 24 mm bore two-stage light gas gun, plate impact experiments were performed on unsaturated clay at 3 moisture contents-0, 8% and 15%-to obtain its Hugoniot data.The shock wave motions in the samples were detected by fiber-optic pins, and the pressure in the sample ranged from 1.29 to 32.54 GPa.The experiment results indicate that the moisture content has a significant effect on the shock compression properties of unsaturated clay.While compressed, the gas and water in pores cannot escape promptly due to the transient loading time, thus they dominate the shock compression properties of unsaturated clay together with the solid grains.Since water is much stiffer than gas, the compressibility of unsaturated clay decreases as the moisture content increases.Besides, a modified three-phase equation of state is introduced to describe the pressure-density relationship of the unsaturated clay, which shows good agreement with the experimental data.
- unsaturated clay /
- moisture content /
- two-stage light gas gun /
- plate impact /
- equation of state

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图 1 磁测速原理示意图

Figure 1. Schematic of magnetic measurement of velocity

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图 2 平板撞击实验示意图

Figure 2. Schematic of plate impact configuration before impact

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图 3 实验测得的典型探针信号

Figure 3. Signal of fiber-optic pins measured in experiments

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图 4 黏土试样的D-u关系

Figure 4. The relationship between D and u of clay specimen at different moisture contents

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图 5 黏土试样的p-ρ Hugoniot曲线

Figure 5. The p-ρ Hogoniot curves of clay specimen at different moisture contents

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图 6 含水率为8%的试样的压力-密度关系比较

Figure 6. Comparison between experimental data and 2 three-phase EOS of clay specimen at 8% moisture content

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图 7 含水率为15%的试样的压力-密度关系比较

Figure 7. Comparison between experimental data and 2 three-phase EOS of clay specimen at 15% moisture content

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表 1 黏土试样颗粒分析结果

Table 1. Particle size distribution in the clay sample

Particle dimension/ (mm)	Mass proportion/ (%)
<0.005	28.6
0.005-0.075	71.4
>0.075	0

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表 2 飞片材料参数

Table 2. Parameters of flyer plate materials

Material	Density/ (g/cm³)	Sound speed/ (km/s)	λ
Al alloy	2.785	5.328	1.338
Cu	8.93	3.940	1.489
Ta	16.656	3.437	1.19

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表 3 平板撞击实验结果

Table 3. Results of plate impact experiments

Sample condition	Flyer material	Flyer velocity/ (km/s)	Shock arrival time/ (ns)	Sample thickness/ (mm)	Particle velocity/ (km/s)	Shock velocity/ (km/s)	Longitudinal stress/ (GPa)
Dry clay	Al	0.561	1 868	2.98	0.48	1.60	1.29
	Cu	1.042	1 054	2.96	0.92	2.81	4.40
	Cu	2.340	658	2.94	1.97	4.47	14.95
	Ta	3.180	556	3.02	2.79	5.43	25.71
Wet clay (Moisture content=8%)	Al	0.563	1 564	2.94	0.46	1.88	1.58
	Cu	1.101	956	2.98	0.95	3.12	5.46
	Cu	2.290	640	3.00	1.89	4.69	16.26
	Ta	3.190	500	2.94	2.74	5.88	29.60
Wet clay (Moisture content=15%)	Al	0.495	1 192	3.00	0.37	2.52	1.84
	Cu	1.142	848	2.98	0.97	3.51	6.63
	Cu	2.370	538	2.88	1.89	5.35	19.81
	Ta	3.130	478	3.01	2.64	6.30	32.54

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