煤田地质与勘探2025，Vol.53Issue(10)：182-190,9.DOI:10.12363/issn.1001-1986.25.04.0229
含界面人工坝体试样水浸损伤机理及纳米改性增强
Water immersion-induced damage mechanisms and enhancement via nano-modification for artificial dam specimens with vertical interfaces
摘要
Abstract
[Objective]To accelerate ecological protection and high-quality development in the Yellow River basin,the concept of"conductivity,storage,and utilization"has been proposed to achieve the mine water storage and protection by transforming goafs into underground reservoirs and utilizing waterproof concrete dams.However,under the action of long-term water immersion and mining activity,the interfaces of composite concrete dam structures might undergo strength degradation,leading to hidden hazards.[Methods]By incorporating 0.5％and 1.0％nano-SiO2,-Al2O3,and-TiO2,this study prepared specimens with one vertical interface each that comprised double semi-cylinders through cast-ing twice.Then,through non-metallic ultrasonic detection and uniaxial compression experiments,this study investigated the variations in the interface stability and strength of nano-modified concrete specimens with interfaces after water im-mersion.[Results and Conclusions]The failure of the specimens with vertical interfaces exhibited two stages:interface rupture and complete failure.This finding reveals the staged failure mechanisms of the specimens with vertical inter-faces under compression.After 14 days of water immersion,normal specimens showed average decreases of 19.15％and 15.11％in complete failure strength and interface rupture strength,respectively.This result indicates that the water im-mersion environment produced a deteriorating effect on both the complete failure strength and interface rupture strength of the specimens.The analysis of the failure characteristics of the specimens reveals that only the unimmersed speci-mens mixed with 0.5％nano-TiO2 exhibited shear failure through the interfaces,while the remaining specimens showed splitting failure parallel to the interfaces.This finding demonstrates that the incorporation of 0.5％nano-TiO2 could en-hance the resistance to shear of the interfaces.However,such enhancement was weakened by water immersion.Com-pared to normal specimens with vertical interfaces,those mixed with 0.5％nano-TiO2 presented an increase of 35.23％in interface rupture strength,suggesting a significant enhancement in the interfaces.In contrast,the specimens incorporat-ing 0.5％nano-SiO2 exhibited an increase of 37.14％in complete failure strength,implying a generally high perform-ance in matrix enhancement.The specimens incorporating 0.5％nano-SiO2 showed the greatest improvement in elastic modulus and deformation modulus,which increased by 30.34％and 39.25％,respectively.The results of this study hold significant scientific value and provide essential engineering guidance for the long-term safe,stable operation of under-ground water reservoirs and related engineering facilities.关键词
煤矿/地下水库/含竖直界面/水浸弱化/纳米材料/力学特征/增强规律Key words
coal mine/underground reservoir/vertical interface/water immersion-induced weakness/nanomaterial/mechanical property/enhancement pattern分类
建筑与水利引用本文复制引用
李宜家,郝宪杰,陈昱光,庞天,杨怀翔,李航,季金一,李欣宇..含界面人工坝体试样水浸损伤机理及纳米改性增强[J].煤田地质与勘探,2025,53(10):182-190,9.基金项目
煤炭开采水资源保护与利用国家重点实验室2020年开放基金课题(GINY-20-113-05) （GINY-20-113-05）
中国矿业大学(北京)内蒙古研究院成果转化项目(IMRI23008) （北京）
中央高校基本科研业务费中国矿业大学(北京)博士研究生拔尖创新人才培育基金项目(BBJ2025008) （北京）
