泥岩毛细吸水特性及吸水量时程模型研究  

Study on capillary water absorption characteristics and time course modeling of water absorption in mudstone

作　　者：赵红 董玉杰 李晓宁 沈灿 凌斯祥[5] 冯俊杰 ZHAO Hong;DONG Yujie;LI Xiaoning;SHEN Can;LING Sixiang;FENG Junjie(School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621000,Sichuan,China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province,Mianyang 621000,Sichuan,China;No.5 Geological Party,Tibet Bureau of Geology and Mineral Exploration and Development,Golmud 816000,Qinghai,China;School of Emergency Management,Xihua University,Chengdu 610039,Sichuan,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,Sichuan,China)

机构地区：[1]西南科技大学土木工程与建筑学院,四川绵阳621000 [2]工程材料与结构冲击振动四川省重点实验室,四川绵阳621000 [3]西藏自治区地质矿产勘查开发局第五地质大队,青海格尔木816000 [4]西华大学应急管理学院,四川成都610039 [5]西南交通大学地球科学与环境学院,四川成都611756

出　　处：《水利水电技术(中英文)》2025年第3期222-235,共14页Water Resources and Hydropower Engineering

基　　金：国家自然科学基金项目(42077271);四川省中央引导地方科技发展专项项目(23ZYZYTS0476);四川省重点研发计划项目(23ZDYF2283)。

摘　　要：【目的】研究红层泥岩毛细吸水特性及吸水量随时间变化规律,提出泥岩的吸水量预测方法,并据此开展吸水量临界值的计算,为地下水条件下红层泥岩吸水量预测、吸水软化特性的理论、试验研究及致灾机理分析提供参考。【方法】取四川雅安第三系名山组、四川简阳白垩系灌口组、甘肃成县白垩系鸡山组红层泥岩,开展毛细吸水试验,结合X射线衍射测试、压汞测试、接触角测试和扫描电镜测试,对红层泥岩的微观矿物成分、孔隙结构、毛细吸水前后的微观结构变化、毛细吸水规律特征曲线及其影响因素进行分析。【结果】结果显示:不同地区红层泥岩的毛细吸水特性有一定差异,毛细吸水速率不断减小;毛细吸水系数与吸水率均呈正相关;毛细吸水高度与时间的平方根呈现良好的线性关系。基于L-W方程和多孔介质毛细吸水理论,考虑矿物成分对毛细吸水量的影响,提出毛细吸水量时程模型;毛细吸水率与石英含量呈负相关(R2=0.79)、与黏土矿物含量呈正相关(R2=0.80)。【结论】泥岩毛细吸水特性及影响因素具有一定的规律性,并将红层泥岩毛细吸水在微观层面划分为水分吸附阶段和水分迁移阶段;所提出的毛细吸水量时程模型能够有效进行红层泥岩的吸水量预测,且误差较小。[Objective]To study the capillary water absorption characteristics of red mudstone and the change rule of water absorption with time,to put forward the prediction method of water absorption of mudstone,and to carry out the calculation of the critical value of water absorption accordingly,so as to provide references for the prediction of water absorption,theoretical and experimental research on the softening characteristics of water absorption and the analysis of disaster-causing mechanism of red mudstone under the condition of groundwater.[Methods]The red mudstone of the Tertiary Mingshan Formation of Yaan,Sichuan,the Cretaceous Guankou Formation of Jianyang,Sichuan,and the Cretaceous Jishan Formation of Chengxian,Gansu,were taken to carry out the capillary water absorption test,and combined with the X-ray diffraction test,the pressurized mercury test,the contact angle test,and the SEM test,to analyze the micromineral compositions of the red mudstone,the pore structure,the microstructural changes before and after capillary water absorption,the characteristic curves of capillary water absorption law and its influencing factors.[Results]The results show that:the capillary water absorption characteristics of the red bedded mudstone in different regions have some differences,and the capillary water absorption rate is decreasing;the capillary absorption coefficients are positively correlated with the absorption rates;the absorption heights show a good linear relationship with the square root of time;based on the L-W equation and the theory of capillary water absorption in porous media,and considering the influence of mineral composition on the capillary water absorption,a time course model of capillary water absorption is proposed;the capillary water absorption rate is negatively correlated with the content of quartz(R2=0.79)and positively correlated with the content of clay minerals(R2=0.80).[Conclusion]The capillary water absorption characteristics and influencing factors of mudstone have certain regularity,and the

关 键 词：红层泥岩 毛细吸水试验 毛细吸水特性 吸水量 时程误差较小模型 影响因素 扫描电镜测试 微观结构 

分 类 号：TU45[建筑科学—岩土工程]