河南理工大学学报（自然科学版）2025，Vol.44Issue(4)：160-169,10.DOI:10.16186/j.cnki.1673-9787.2023120016
饱水作用对白砂岩抗拉强度及声发射特性影响的试验研究
Experimental study on the effect of water saturation on the tensile strength and acoustic emission characteristics of white sandstone
摘要
Abstract
Objectives To investigate the mechanical degradation of white sandstone under water saturation by analyzing the macroscopic effect of saturation on tensile strength,acoustic emission(AE)characteris-tics,and fracture surface morphology.Methods Brazilian splitting tests and real-time AE monitoring were conducted on white sandstone specimens in both water-saturated and natural(dry)states to assess the ef-fect of water saturation.Results The experimental results indicate that:(1)Saturation leads to the dissolu-tion of mineral particles within the white sandstone,reducing the cohesion between particles,causing me-chanical damage and an 11.3%decrease in tensile strength;(2)The deformation and strength reduction caused by saturation result in a significant decrease in the unit area splitting energy during loading;(3)Af-ter saturation,the acoustic emission count and cumulative energy weaken during early activity,with their peak values occurring later than the peak load;(4)Acoustic emission RA-AF analysis shows that the pro-portion of tensile fractures decreases after saturation,while shear fractures increase.In both saturated and natural states,shear fractures increase sharply near peak load;(5)The acoustic emission b-value de-creases after saturation,indicating a reduction in small-scale fractures and an increase in large-scale frac-tures during splitting.A sharp drop in real-time b-value during loading can serve as a precursor to speci-men failure;(6)Saturation causes a decrease in roughness indicators of the splitting joint surface,includ-ing root mean square slope,roughness profile index,actual joint surface area,and roughness coefficient.Conclusions Water saturation significantly reduces the tensile strength of white sandstone,increases the proportion of large-scale fractures,and results in a smoother fracture surface.关键词
饱水作用/砂岩/抗拉强度/声发射/节理面形貌Key words
water saturation/sandstone/tensile strength/acoustic emission/joint surface morphology分类
建筑与水利引用本文复制引用
徐荣超,阎震,周文朋,胡玉波,王怡博,高粱..饱水作用对白砂岩抗拉强度及声发射特性影响的试验研究[J].河南理工大学学报（自然科学版）,2025,44(4):160-169,10.基金项目
国家自然科学基金资助项目(51709113) （51709113）
河南省科技攻关计划项目(222102320141) （222102320141）
