基于核磁共振技术的硬石膏岩孔隙结构冻融损伤特性

候超; 靳晓光; 何杰

doi:10.3969/j.issn.0258-2724.20230314

基于核磁共振技术的硬石膏岩孔隙结构冻融损伤特性

doi: 10.3969/j.issn.0258-2724.20230314

候超^1,,
靳晓光^{2, 3, 4, ,},
何杰²

1.
河南科技大学土木建筑学院，洛阳 471000
2.
重庆大学土木工程学院，重庆 400044
3.
重庆大学山地城镇建设与新技术教育部重点实验室，重庆 400044
4.
重庆大学煤矿灾害动力学与控制国家重点实验室，重庆 400044

基金项目: 国家重点研发计划课题（2021YFB3901402）；重庆市交通科技项目（2022-05）.

详细信息

作者简介:
候超（1990—），男，讲师，博士，研究方向为寒区岩石损伤力学，E-mail：chaohou@haust.edu.cn

通讯作者:
靳晓光（1967—），男，教授，博士生导师，研究方向为隧道及地下空间工程，E-mail： jinxiaoguang@cqu.edu.cn

中图分类号: TU45
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- 被引次数: 0
出版历程
- 收稿日期: 2023-06-30
- 修回日期: 2023-09-20
- 网络出版日期: 2024-11-21

Freeze-Thaw Damage Characteristics of Anhydrite Rock Pore Structures Based on Nuclear Magnetic Resonance Technology

HOU Chao^1
,,
JIN Xiaoguang^{2, 3, 4
, ,},
HE Jie²

1.
School of Civil Engineering and Architecture, Henan University of Science and Technology, Luoyang 471000, China
2.
School of Civil Engineering, Chongqing University, Chongqing 400044, China
3.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing 400045, China
4.
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China

摘要

摘要:
为研究寒区遭受冻融作用的石膏质岩石的细观和微观孔隙结构损伤特性，以硬石膏岩为研究对象，基于核磁共振试验，获得硬石膏岩在冻融循环作用下的孔隙度、孔径和孔喉分布特征；结合分形理论，推导岩石孔径和孔喉分形维数的计算公式，探讨冻融循环作用对硬石膏岩孔隙结构分形维数的影响规律；建立不同孔隙结构及孔隙分形维数与孔隙度之间的关系，并指出对孔隙度影响程度较大的孔隙结构类型. 结果表明：冻融循环作用下,硬石膏岩的孔径呈“三峰”型分布，随着冻融次数增加，硬石膏岩微孔(孔径r ≤ 0.1 μm)、PT-Ⅰ (r∈(0～0.1] μm)孔喉、孔隙分形维数($ {\text{D}}_{\text{P}} $)和孔喉分形维数($ {\text{D}}_{\text{PT}} $)呈指数型递减，而中孔(r∈[0.1～1.0) μm)、大孔(r≥1.0 μm)、PT-Ⅱ (r∈(0.1～4.0] μm)孔喉和孔隙度则呈指数型递增，规模较大的孔隙、规模较小的孔喉以及孔喉分形维数对硬石膏岩孔隙度的影响程度较大.
- 核磁共振 /
- 硬石膏岩 /
- 孔隙结构 /
- 冻融循环 /
- 损伤特性
Abstract:
In order to study the damage characteristics of meso and micro pore structures of gypsum rock subjected to freeze-thaw cycles in cold regions, anhydrite rock was taken as the research object, and the porosity, pore size, and pore throat distribution characteristics of anhydrite rock were obtained based on nuclear magnetic resonance (NMR) experiments. According to fractal theory, the calculation formulas of the fractal dimension of pore size and pore throat of rock were derived, and the influence of freeze-thaw cycles on the fractal dimension of pore structures of anhydrite rock was discussed. The relationship among different pore structures, fractal dimensions of pores, and porosity was established, and the pore structure types that had a greater impact on porosity were revealed. The results show that the pore size of anhydrite rock under freeze-thaw cycles presents a “three-peak” distribution. With the increase in freeze-thaw cycles, the micropore (r ≤ 0.1 μm), PT-Ⅰ (r∈[0–0.1) μm) of pore throat, fractal dimension of pore (D_P), and fractal dimension of pore throat (D_PT) decrease exponentially. While, the mesopores (r∈[0.1–1) μm), macropores (r ≥ 1 μm), PT-Ⅱ(r∈(0.1–4] μm) of pore throats, and porosity increase exponentially. It can be concluded that larger pores, as well as smaller pore throats and fractal dimension of pore throats, have a greater influence on the porosity of anhydrite rock.
- nuclear magnetic resonance /
- anhydrite rock /
- pore structure /
- freeze-thaw cycle /
- damage characteristic

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图 1 硬石膏矿物组成

Figure 1. Mineral composition of anhydrite rock

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图 2 试验装置

Figure 2. Test device

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图 3 冻融循环作用下硬石膏岩孔径分布演化曲线

Figure 3. Pore size distribution evolution curves of anhydrite rock under freeze-thaw cycles

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图 4 冻融作用下N₂试样不同类型孔隙对应的曲线面积演化规律

Figure 4. Curve area evolution law for different types of pores of N₂ sample under freeze-thaw cycles

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图 5 冻融循环作用下硬石膏岩孔喉分布演化

Figure 5. Pore throat distribution evolution of anhydrite rock under freeze-thaw cycles

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图 6 冻融循环作用下N₂试样不同类型孔喉占比演化规律

Figure 6. Evolution law of different types of pore throats in N₂ sample under freeze-thaw cycles

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图 7 冻融循环作用下N₂试样孔隙结构分形维数演化规律

Figure 7. Fractal dimension evolution law of pore structures for N₂ sample under freeze-thaw cycles

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图 8 冻融作用下N₂试样各类孔隙分布曲线面积与孔隙度关系

Figure 8. Relationship between various pore size distribution curve area and porosity of N₂ sample under freeze-thaw cycles

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图 9 冻融作用下 N₂ 试样各类孔喉占比与孔隙度关系

Figure 9. Relationship between various pore throat proportion and porosity of N₂ sample under freeze-thaw cycles

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图 10 N₂试样孔隙结构分形维数与孔隙度关系

Figure 10. Relationship between fractal dimension of pore structure and porosity of N₂ sample

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表 1 不同冻融循环次数下硬石膏岩孔隙度

Table 1. Porosity of anhydrite under different freeze-thaw cycles %

试样编号	N/次
试样编号	0	30	60	90	120
N₁	0.64	0.78	0.91	1.03	1.12
N₂	0.73	0.79	0.93	1.06	1.15
N₃	0.7	0.81	0.92	0.98

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表 2 不同类型孔隙对应的曲线面积

Table 2. Curve area for different types of pores

试样编号	孔隙类型	N/次
试样编号	孔隙类型	0	30	60	90	120
N₁	微孔	0.17	0.11	0.14	0.1	0.06
	中孔	0.94	1.51	1.67	2.12	1.61
	大孔	17.38	19.86	21.28	25.08	37.77
N₂	微孔	0.14	0.12	0.11	0.09	0.06
	中孔	0.86	0.99	1.18	1.41	1.54
	大孔	12.79	17.26	20.15	24.63	33.34
N₃	微孔	0.12	0.09	0.08	0.05
	中孔	1.21	1.5	1.67	2.22
	大孔	13.96	19.11	20.18	24.06

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表 3 冻融循环作用下硬石膏岩不同类型孔喉占比

Table 3. Proportion of different types of pore throats for anhydrite rock under freeze-thaw cycles %

试样编号	孔喉类型	N/次
试样编号	孔喉类型	0	30	60	90	120
N₁	PT-Ⅰ	41.39	20.64	19.27	17.86	14.12
	PT-Ⅱ	42.41	44.61	56.77	64.77	61.03
	PT-Ⅲ	16.08	34.75	23.96	17.37	24.85
	PT-Ⅰ	43.14	36.64	28.83	18.62	16.58
N₂	PT-Ⅱ	31.37	42.14	45.65	55.07	59.90
	PT-Ⅲ	25.50	21.22	25.52	26.30	23.31
	PT-Ⅰ	33.14	18.19	19.15	15.24
N₃	PT-Ⅱ	49.37	59.68	65.63	69.26
	PT-Ⅲ	17.50	22.13	15.22	15.50

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