考虑孔隙微观结构特征红砂岩自渗吸特性的研究

毕锋 周(重庆市江津区规划和自然资源局，中国)
颖 周(重庆市江津区规划和自然资源局，中国)
瑞川 田(重庆蜀通岩土工程有限公司，中国)
飞 干(贵州大学土木工程学院，中国)

摘要

为微观孔隙结构对红砂岩毛细水迁移特征的影响，论文采用低场核磁共振设备测试红砂岩的T2谱，进而获得红砂岩孔径分布和分形特征以及孔隙数量，并测试红砂岩吸14 d内吸水质量，同时比较了考虑孔隙分布的毛细吸水质量与实验值差距。结果表明：红砂岩孔隙数量分布差距巨大，数量比达到4406∶69∶1（小孔∶中孔∶大孔），且大孔分形维数大于中孔，大孔分布较为复杂，微孔不具有分形特征。同时，红砂岩毛细吸水质量变化前24h与时间呈 M(t)=1.1078t 0.6577 的幂函数变化，24h之后变化微小。另外，毛细吸水质量采用累加法计算与实验值基本吻合，故在计算毛细吸水质量时应充分考虑孔径分布特征，不能简单假设为一种孔径进行计算。

关键词

自渗吸；吸水质量；孔隙微观结构特征；NMR；红砂岩

参考

Jia H, Dong B, Wu D, et al. Capillary Imbibition in Layered Sandstone[J].Water,2023,15(4):737.

Zhao F, Sun Q, Zhang W. Combined effects of salts and wetting–drying cycles on granite weathering[J]. Bulletin of Engineering Geology and the Environment,2020,79(7): 3707-3720.

Jiang Q, Deng H, Li J, et al. The degradation effect and mechanism by water-rock interaction in the layered sandstone in the Three Gorges reservoir area[J]. Arabian Journal of Geosciences,2019,12(23).

Lin Yang D G Y Z. Relationship between sorptivity and capillary coefficient for water absorption of cement-based materials: Theory analysis and experiment[J]. Royal Society Open Science,2019,6(6):190112.

Zhang Y, Zhang Y, Huang J. Experimental study on capillary water absorption of sandstones from different grotto heritage sites in China[J]. Heritage Science,2022,10(1).

Van Belleghem B, Montoya R, Dewanckele J, et al. Capillary water absorption in cracked and uncracked mortar –A comparison between experimental study and finite element analysis[J]. Construction and Building Materials,2016(110):154-162.

Oguchi C T, Yu S. A review of theoretical salt weathering studies for stone heritage[J]. Progress in Earth and Planetary Science,2021,8(1).

Cárdenes V, Mateos F J, Fernández-Lorenzo S. Analysis of the correlations between freeze–thaw and salt crystallization tests[J]. Environmental earth sciences,2014,71(3):1123-1134.

Grant S A, Bachman J, Raats P A C, et al. Effect of temperature on capillary pressure[J]. Environmental Mechanics,2002(129):199-212.

Arbatan T, Shen W. Measurement of the Surface Tension of Liquid Marbles[J]. Langmuir,2011,27(21):12923-12929.

Bell J M, Cameron F K. The flow of liquids through capillary spaces[J]. The Journal of Physical Chemistry,2002(10):658-674.

Washburn E W. The dynamics of capillary flow[J]. Physical Review Jourals Archive,1921(17):273.

Zhang S, Pei H. Rate of capillary rise in quartz nanochannels considering the dynamic contact angle by using molecular dynamics[J]. Powder Technology,2020(372):477-485.

Leventis A, Verganelakis D A, Halse M R, et al. Capillary imbibition and pore characterisation in cement pastes[J]. Transport in porous media,2000,39(2):143-157.

Hammecker C, Jeannette D. Modelling the capillary imbibition kinetics in sedimentary rocks; role of petrographical features[J]. Transport in porous media,1994,17(3): 285-303.

Liang K, Zeng X, Zhou X, et al. Investigation of the capillary rise in cement-based materials by using electrical resistivity measurement[J]. Construction and Building Materials,2018, (173):811-819.

何娅兰,宁麟,李炀,等.基于核磁共振技术对水泥砂浆高温后孔隙结构及水分迁移特征的研究[J].硅酸盐通报,2023,42(7):2336-2343.

Standnes D C. Spontaneous imbibition of water into cylindrical cores with high aspect ratio: Numerical and experimental results[J]. Journal of Petroleum Science and Engineering,2006,50(2):151-160.

Romero E. A microstructural insight into compacted clayey soils and their hydraulic properties[J]. Engineering Geology,2013(165):3-19.

Bi J, Du C, Zhao Y, et al. Characterization of shear behavior and damage mechanism of periodic thermal loading sandstone based on NMR technique[J]. Engineering Geology,2023(325):107272.

Jin P, Hu Y, Shao J, et al. Influence of Temperature on the Structure of Pore–Fracture of Sandstone[J]. Rock Mechanics and Rock Engineering,2020,53(1):1-12.

Zhao H, Qin X, Liu J, et al. Pore structure characterization of early-age cement pastes blended with high-volume fly ash[J]. Construction and Building Materials,2018(189):934-946.

李海波,朱巨义,郭和坤.核磁共振T2谱换算孔隙半径分布方法研究[J].波谱学杂志,2008(2):273-280.

van der Heijden G H A, Huinink H P, Pel L, et al. One-dimensional scanning of moisture in heated porous building materials with NMR[J]. Journal of Magnetic Resonance,2011,208(2):235-242.

Zhao H, Ding J, Huang Y, et al. Experimental analysis on the relationship between pore structure and capillary water absorption characteristics of cement‐based materials[J]. Structural Concrete,2019,20(5): 1750-1762.

Englert A H, Rodrigues R T, Rubio J. Dissolved air flotation (DAF) of fine quartz particles using an amine as collector[J]. International Journal of Mineral Processing,2009,90(1-4): 27-34.

DOI: http://dx.doi.org/10.12345/smg.v6i1.15762