水文地质工程地质2025，Vol.52Issue(2)：63-71,9.DOI:10.16030/j.cnki.issn.1000-3665.202403055
基于核磁共振与波速测试的风化砂岩吸水性特征研究
Characteristics of water absorption capacity of weathered sandstone based on nuclear magnetic resonance and wave velocity testing
摘要
Abstract
Water is a key factor in the weathering and erosion of rocks,and highly porous rocks are generally more susceptible to weathering.However,there has been a lack of in-situ methods for assessing the water absorption capacity of rocks.To investigate the controlling factors of rock water absorption capacity,sandstone with different degrees of weathering collected from the Yungang Grottoes were selected as the study material.Nuclear magnetic resonance(NMR)technology was employed to test the porosity and pore size distribution of rock samples,and to establish the relationship between the free water absorption rate of sandstone and its density,porosity,and pore size.The results indicate that there is a linear relationship between the free water absorption rate and the density of sandstone,with the slope of the relationship being influenced by the degree of weathering.Additionally,the free water absorption rate of the sandstone is positively correlated with porosity and the proportion of small pores(0.1-1.0 μm),with porosity being the primary controlling factor and pore structure being the secondary controlling factor.This study deepens our understanding of the mechanisms controlling the water absorption of weathered sandstone.Furthermore,since wave velocity is also influenced by porosity and pore structure,a good linear relationship was observed between the free water absorption rate and wave velocity.Therefore,it is suggested that the free water absorption rate of rock mass can be estimated by in-situ testing of wave velocity.关键词
孔隙度/吸水性/声波速度/孔径分布/核磁共振Key words
porosity/water absorption/acoustic wave velocity/pore size distribution/nuclear magnetic resonance分类
地质学引用本文复制引用
牛然,蒋小伟,闫永帅,欧阳恺皋,孙献春,闫宏彬,万力..基于核磁共振与波速测试的风化砂岩吸水性特征研究[J].水文地质工程地质,2025,52(2):63-71,9.基金项目
山西省科技重大专项计划项目(202201150501024) （202201150501024）
