饱水细砂岩动态抗拉与抗压强度试验对比研究

王光勇; 余锐; 马东方; 侯远

doi:10.11858/gywlxb.20190857

饱水细砂岩动态抗拉与抗压强度试验对比研究

doi: 10.11858/gywlxb.20190857

1.
河南理工大学土木工程学院，河南焦作　454000
2.
宁波大学科学技术学院，浙江宁波　315211

基金项目: 国家自然科学基金-山西煤基低碳联合基金重点支持项目（U1810203）

详细信息

作者简介:
王光勇(1977—)，男，博士，副教授，硕士生导师，主要从事岩土工程动载试验研究. E-mail：wgy2003@mail.ustc.edu.cn

中图分类号: O347.3; TU45
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出版历程
- 收稿日期: 2019-11-15
- 修回日期: 2019-12-01
- 发布日期: 2020-02-25

Comparative Study on Dynamic Tensile and Compressive Strength of the Saturated Fine Sandstone

1.
School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China
2.
College of Science & Technology, Ningbo University, Ningbo 315211, Zhejiang, China

摘要

摘要: 使用霍普金森压杆（SHPB）装置对天然状态和饱水状态下的细砂岩进行单轴动态压缩试验和动态劈裂试验，研究水和加载速率对细砂岩动态抗拉、抗压强度的影响及其差异性，并且结合数字图像相关（DIC）技术，分析细砂岩动态抗拉、抗压时的破坏机制。试验结果表明：两种状态下的细砂岩动态抗拉、抗压强度有明显的率效应，随着加载速率的增大而增大，且相同加载速率下，细砂岩在饱水状态下比天然状态下的动态抗压强度小，而抗拉强度比天然状态下的大；水的存在对细砂岩动态抗压强度和抗拉强度的应变率效应影响不大，但水能提高细砂岩动态抗压和抗拉强度增强因子，并且对细砂岩动态抗拉强度增强因子的提高更显著；在动态受压过程中饱水状态岩样表面的应变集中处较天然状态下明显更少，应变梯度更显著，在动态受拉过程中拉剪效果被削弱。
- 饱水细砂岩 /
- 动态强度 /
- 动态强度增强因子 /
- 数字图像相关 /
- 破坏机制
Abstract: Using split Hopkinson compression bar (SHPB) device, uniaxial dynamic compression tests and dynamic split tests on fine sandstone in natural state and saturated state were carried out. The influence and difference of water and loading rate on dynamic tensile and compressive strength of fine sandstone were studied, and the failure mechanism of the fine sandstone in dynamic tension and compression was analyzed with digital image correlation (DIC) technology. The test results show that the dynamic compressive strength and tensile strength of the fine sandstone under the two states have obvious strain rate dependent effect, and they increase with the increase of loading rate. Under the same loading rate, the dynamic compressive strength of fine sandstone in saturated state is smaller than that in natural state, while the tensile strength in saturated state is larger. Water has little effect on the strain rate effect of dynamic compressive strength and tensile strength for the fine sandstone. However, water can improve the dynamic compressive strength and tensile strength enhancement factor of the fine sandstone, and has a more significant effect on the dynamic tensile strength enhancement factor. In the process of dynamic compression, the surface strain concentration of the rock specimen in saturated state is significantly less than that in natural state, the strain gradient is more significant, and the tensile-shear effect is weakened during the dynamic tensile process.
- saturated fine sandstone /
- dynamic strength /
- dynamic increase factor /
- digital image correlation /
- failure mechanism

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图 1 SHPB装置实物

Figure 1. Picture of actual SHPB equipment

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图 2 波形整形前后对比

Figure 2. Comparison before and after waveform shaping

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图 3 SHPB装置示意图

Figure 3. Schematic of SHPB experiment

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图 4 动态试验试样

Figure 4. Specimens under dynamic tests

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图 5 应力平衡曲线

Figure 5. Curves of stress balance

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图 6 不同加载速率下细砂岩的应力-应变曲线

Figure 6. Stress-strain curves of the fine sandstone under different loading rates

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图 7 不同加载速率下细砂岩的动态抗压强度曲线

Figure 7. Relationship curves of dynamic compressive strength with different loading rates of the fine sandstone

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图 8 动载下天然岩样表面出现裂纹瞬时应变云图

Figure 8. Instantaneous strain nephogram of a natural rock specimen with the crack appearing on the surface under dynamic load

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图 9 动载下饱水岩样表面出现裂纹瞬时应变云图

Figure 9. Instantaneous strain nephogram of a saturated rock specimen with the crack appearing on the surface under dynamic load

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图 10 不同加载速率下细砂岩动态拉应力-时间曲线

Figure 10. Dynamic tensile stress-time curves of the fine sandstone under different loading rates

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图 11 不同加载速率下细砂岩的动态抗拉强度曲线

Figure 11. Relationship curves of dynamic tensile strength with different loading rates of the fine sandstone

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图 12 动态劈裂试验中天然状态岩样表面出现裂纹瞬时应变云图

Figure 12. Instantaneous strain nephogram of a natural rock sample with the crack appearing on the surface in dynamic splitting test

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图 13 动态劈裂试验中饱水状态岩样表面出现裂纹瞬时应变云图

Figure 13. Instantaneous strain nephogram of a saturated rock sample with the crack appearing on the surface in dynamic splitting test

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图 14 不同加载速率下饱水状态和天然状态岩样的动态强度增强因子关系曲线

Figure 14. Relationship curves of dynamic strength increasing factors for saturated and natural rock specimens under different loading rates

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表 1 试验分组

Table 1. Test group

Type of test	State of rock samples	Group	Loading rate/（m·s^–1）	Temperature/℃
Compression test	Natural state	A-1	8.01	20
		A-2	5.62	20
		A-3	2.93	20
	Saturation state	A-4	8.27	20
		A-5	5.12	20
		A-6	2.05	20
Splitting test	Natural state	B-1	8.65	20
		B-2	5.28	20
		B-3	1.87	20
	Saturation state	B-4	8.89	20
		B-5	5.34	20
		B-6	1.44	20

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