水压作用下混凝土孔隙结构及渗透特性研究  

Pore structure and permeability characteristics of concrete under water pressure

作　　者：聂婷婷 任倩慧 朱元涛 岳一凡 NIE Tingting;REN Qianhui;ZHU Yuantao;YUE Yifan(School of Civil Engineering and Water Resources,Qinghai University,Xining 810016,China;Laboratory of Upper Yellow River Ecological Protection and High-Quality Development,Xining 810016,China;Key Laboratory of Water Ecological Management and Protection in River Source Areas,Ministry of Water Resources,Xining 810016,China)

机构地区：[1]青海大学土木水利学院,西宁810016 [2]黄河上游生态保护与高质量发展实验室,西宁810016 [3]水利部江河源区水生态治理与保护重点实验室,西宁810016

出　　处：《青海大学学报》2025年第1期85-93,共9页Journal of Qinghai University

基　　金：国家自然科学基金项目(52379127)。

摘　　要：为深入探究水压作用下混凝土孔隙结构变化与渗透特性的相互影响,本文设置5组不同渗透压力作为对照,分别进行透水试验及压汞试验,并收集孔隙结构特征、渗透系数等相关数据,进行相关性分析。结果表明:随着水压增加,混凝土孔隙率增加,连通性增强,渗透系数增大;沿着水流渗透方向孔隙结构产生不同发育,试件下部以小孔孔隙发育为主,而试件上部优先流作用明显,大孔、中孔和小孔均有发育。依据相关性分析对孔隙量、孔隙率等指标进行综合评价可知,试件下部渗透特性主要受小孔孔隙影响,而试件上部渗透特性受大孔、中孔和小孔共同影响。In order to investigate the mutual influence between the changes in pore structure and permeability characteristics of concrete under water pressure,this paper sets up 5 permeability pressures as controls to conduct permeability tests and mercury intrusion tests.Relevant data such as pore structure characteristics and permeability coefficients were collected for correlation analysis.The results are as follows:With the increase of water pressure,the porosity of concrete increases,the connectivity is enhanced,and the permeability coefficient increases.The pore structure develops differently along the direction of water flow infiltration.The lower part of the specimen is mainly composed of small pores,while the upper part has obvious preferential flow effects,with large,medium and small pores all developing.According to the correlation analysis,a comprehensive evaluation of indicators such as pore volume and porosity showed that the permeability characteristics of lower part were mainly controlled by small pores,while that of upper part were jointly influenced by large,medium and small pores.

关 键 词：模拟试验 渗透系数 孔隙结构 压汞试验 透水试验 

分 类 号：TV322[水利工程—水工结构工程]