三峡大学学报（自然科学版）2025，Vol.47Issue(2)：62-68,7.DOI:10.13393/j.cnki.issn.1672-948X.2025.02.009
卸荷与干湿循环联合效应下巴东组泥质粉砂岩膨胀特性研究
Expansion Characteristics of Clayey Siltstone of the Badong Formation Under the Combined Effects of Unloading and Dry-Wet Cycling
摘要
Abstract
In order to study the swelling characteristics of muddy siltstone under the combined effect of unloading and wet/dry cycling,the wet/dry cycling tests were carried out under different unloading conditions,and the internal pore evolution of the specimens under different unloading conditions was revealed by nuclear magnetic resonance(NMR),and an expansion model for muddy siltstone was established based on the Huder-Amberg principal modeling correction,which takes into account the unloading damage and the number of wet/dry cycling cycles and verifies its reasonableness.The results show that:with the increase of the number of wet and dry cycles,the swelling of the specimen firstly increases and then decreases,and reaches the maximum value in the fourth cycle;due to the fact that the medium and small pores are greatly reduced after the wet and dry cycles,and only a small increase in the large pores,the porosity decreases with the increase of the number of wet and dry cycles;with the increase of unloading amount,the swelling rate of the specimen decreases;and the increase of the amount of unloading and the number of wet and dry cycles will both exacerbate the damage of the sample and the unloading amount has a greater influence,which leads to the decrease of porosity.关键词
泥质粉砂岩/卸荷/干湿循环/膨胀本构模型/结构损伤机理Key words
muddy siltstone/unloading/dry and wet cycles/swelling constitutive model/structural damage mechanism分类
土木建筑引用本文复制引用
赵二平,蒋尚家,章涵,向国梁,张聪,车德龙..卸荷与干湿循环联合效应下巴东组泥质粉砂岩膨胀特性研究[J].三峡大学学报（自然科学版）,2025,47(2):62-68,7.基金项目
国家自然科学基金项目(U2034203) （U2034203）
