不同pH值溶液冲刷侵蚀下凝灰岩孔隙结构及渗透率变化研究

朱帮义; 刘敬锋; 汤文岗; 黄献文

doi:10.20265/j.cnki.issn.1007-2993.2024-0592

不同pH值溶液冲刷侵蚀下凝灰岩孔隙结构及渗透率变化研究

doi: 10.20265/j.cnki.issn.1007-2993.2024-0592

1.
江苏省岩土工程勘察设计研究院，江苏镇江　212021
2.
江苏省地质局第三地质大队，江苏镇江　212021
3.
苏州科技大学土木工程学院，江苏苏州　215000

基金项目: 国家自然科学基金青年基金项目（52308367）；国家自然科学基金面上项目（52174104）；安徽省住房城乡建设科学技术计划项目（2024-YF094）

详细信息

作者简介:
朱帮义，男，1984年生，大学本科，高级工程师，主要从事岩土工程方面的研究。E-mail：zhubangyi409@163.com

通讯作者:
黄献文，男，1994年生，博士，讲师，主要从事岩土工程方面的研究。E-mail：huangxianwen194@163.com

中图分类号: TU45
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- 文章访问数: 27
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- 被引次数: 0
出版历程
- 收稿日期: 2024-12-18
- 修回日期: 2025-05-31
- 录用日期: 2025-06-26
- 网络出版日期: 2026-06-08
- 刊出日期: 2026-06-08

Changes of pore structure and permeability of tuff under erosion by solution with different pH values

1.
Geotechnical Investigation and Design Institute of Jiangsu Province, Zhenjiang 212021, Jiangsu, China
2.
The Third Geological Brigade of Jiangsu Geological Bureau, Zhenjiang 212021, Jiangsu, China
3.
School of Civil Engineering, Suzhou University of Science and Technology, Suzhou 215000, Jiangsu, China

摘要

摘要: 水溶液侵蚀下岩体性能劣化会引发一系列的工程安全问题。为进一步探究溶液冲刷侵蚀下凝灰岩内部孔隙结构特征及渗透率变化，采用核磁共振（NMR）装置研究了溶液侵蚀下试件内部孔隙结构特征，利用三轴试验装置对试件开展不同围压下的三轴压缩渗透试验，分析溶液pH值、溶液流速对试件孔隙率、各孔径占比、孔隙分形维数及渗透率的影响规律。结果表明：（1）凝灰岩试件内部孔隙以小孔、中孔为主，溶液流速的增大使得试件孔隙率、内部孔隙直径及孔隙数目增加，且增幅为酸性溶液>碱性溶液>中性溶液。（2）凝灰岩试件内部中孔、大孔结构复杂程度要高于微孔、小孔，溶液冲刷下试件各孔径孔隙分形维数均增大，且微孔、小孔增幅要高于中孔、大孔。（3）酸、碱性溶液及溶液流速的增大会对凝灰岩造成侵蚀，增大试件渗透率，围压的存在降低试件内部孔隙的连通性，从而降低凝灰岩试件孔隙率。研究成果可为定量评价溶液冲刷下凝灰岩的性能提供参考依据。
- 化学溶液 /
- 侵蚀冲刷 /
- 孔隙率 /
- 分形维数 /
- 渗透率
Abstract: The deterioration of rock mass performance under aqueous erosion will lead to a series of engineering safety problems. To further explore the pore structure characteristics and permeability changes of tuff samples subjected to solution erosion, nuclear magnetic resonance (NMR) was used to study the pore structure characteristics of tuff samples subjected to solution erosion. Triaxial compression and penetration tests were carried out on specimens under different confining pressures with triaxial test device. The effects of pH value and velocity of solution on the porosity, the proportion of pore size, the fractal dimension of pore size and permeability were analyzed. The results show that: (1) the pore ratio of tuff specimens is mainly small and medium pores. The increase of solution flow rate increases the porosity of tuff specimens, and the diameter and number of internal pores increase, and the increase rate is acidic solution>alkaline solution>neutral solution. (2) The structure complexity of medium and large pores in tuff specimens is higher than that of micro and small pores. The fractal dimension of pores of each aperture increases under solution scouring, and the increase of micro and small pores is higher than that of medium and large pores. (3) The increase of acid, alkaline solution and solution flow rate will cause erosion of tuff, increase the permeability of the specimen, and the existence of confining pressure will reduce the connectivity of the internal pores of the specimen, thus reducing the porosity of the tuff specimen. The research results can provide reference for quantitative evaluation of the properties of tuff under solution erosion.
- chemical solution /
- erosion and scour /
- porosity /
- fractal dimension /
- permeability

HTML全文

图 1 试验选用凝灰岩试件

Figure 1. Tuff specimens were selected for the test

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图 2 pH=7时不同溶液流速下试件T₂图谱

Figure 2. T₂ spectra of specimens at different solution flow rates when pH=7

下载: 全尺寸图片幻灯片

图 3 v=0 m/s时不同pH值溶液侵蚀下试件T₂图谱

Figure 3. T₂ spectra of specimens under erosion by solutions with different pH values at v=0 m/s

下载: 全尺寸图片幻灯片

图 4 pH=7时不同溶液流速下试件孔径分布

Figure 4. Pore size distribution of specimens at different solution flow rates when pH=7

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图 5 不同溶液流速下试件孔隙率变化

Figure 5. Variation of porosity of specimens under different solution flow rates

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图 6 侵蚀凝灰岩内部孔径划分

Figure 6. Internal pore size division of eroded tuff

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图 7 孔径占比分布规律

Figure 7. The distribution law of aperture proportion

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图 8 围压作用下试件孔隙分形维数计算

Figure 8. Calculation of the pore fractal dimension of specimens under confining pressure

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图 9 不同溶液流速下试件分形维数

Figure 9. Fractal dimension of specimens at different solution flow rates

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图 10 不同溶液流速下试件渗透率变化

Figure 10. Variation of permeability of specimens under different solution flow rates

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图 11 不同围压作用下试件渗透率变化

Figure 11. Permeability variation of specimens under different confining pressures

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表 1 基于核磁共振法计算的分形维数

Table 1. Fractal dimension calculated based on the nuclear magnetic resonance method

试样	T₂≤T_2c		T₂≥T_2c
试样	k₁	D_min	k₂	D_max
NHY-3-0	4.823	1.823	0.032	2.968
NHY-3-0.3	4.978	1.978	0.023	2.977
NHY-3-0.6	5.029	2.029	0.044	2.956
NHY-3-0.9	5.388	2.388	0.009	2.991
NHY-7-0	4.544	1.544	0.022	2.978
NHY-7-0.3	5.752	1.752	0.012	2.988
NHY-7-0.6	4.689	1.689	0.011	2.989
NHY-7-0.9	5.022	2.022	0.008	2.982
NHY-11-0	4.888	1.888	0.016	2.984
NHY-11-0.3	4.924	1.924	0.010	2.990
NHY-11-0.6	4.958	1.958	0.009	2.991
NHY-11-0.9	5.267	2.267	0.007	2.993
注：NHY-3-0.6中NHY表示凝灰岩试件，3表示溶液pH=3，0.6表示溶液流速为0.6 m/s。

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