水泥水化碱性环境下腐殖酸溶蚀性试验研究  

Experiment on humus acid dissolution in alkaline environment induced by cement hydration

作　　者：曹净[1] 雷舒羽 刘海明[1] 张兴文 CAO Jing;LEI Shu-yu;LIU Hai-ming;ZHANG Xing-wen(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming,Yunnan 650500,China)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500

出　　处：《岩土力学》2025年第2期437-448,共12页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.41967035)。

摘　　要：在泥炭地基土的改良加固处理中,水泥水化反应使地下水土环境酸碱性发生变化,将对泥炭土中主要有机质成分——腐殖酸产生一系列不良影响,进而劣化泥炭地基土的工程性质。试验通过模拟实际工程中使用水泥处理泥炭地基土时所产生的地下碱性环境,了解水泥水化反应影响泥炭土环境酸碱性的动态变化过程,探索水泥水化碱性环境下泥炭土中腐殖酸的溶蚀性及其影响规律。结果表明:泥炭土环境在水泥水化作用下变化为碱性环境,碱性环境下泥炭土中腐殖酸具有溶蚀性,腐殖酸发生溶蚀后反向调节碱性环境,随着环境酸碱性达到稳定,腐殖酸溶蚀也基本结束。腐殖酸溶蚀作用下泥炭土体内部孔隙增大、骨架结构疏松、整体联结性变差、强度显著降低,腐殖酸溶蚀作用可对泥炭土体造成严重损伤。该研究结果可为水泥水化碱性环境下泥炭土溶蚀性带来的一系列工程问题提供一定的参考价值。During the improvement and reinforcement of peat foundation soils,cement hydration alters the pH of the subsurface water-soil ecosystem.This change negatively impacts humus acid,the main component of organic matter in peat soils,thereby deteriorating the engineering properties of peat foundations.Tests simulated the subsurface alkaline environment by using cement to treat peat soils in actual projects.The objective is to understand the dynamic processes of cement hydration affecting peat soil environments and to investigate the dissolution properties of humus acid in peat soil under alkaline environment during cement hydration.Results indicate that peat soil environment transforms into an alkaline environment under cement hydration,where humus acid in peat soil exhibits dissolution properties under alkaline environment.Humus acid undergoes dissolution and reacts in the alkaline environment.As the pH of the environment stabilizes,the dissolution of humus acid practically ceases.As humus acid dissolves,the pores inside peat soil expand,and the skeleton structure becomes less compact,reducing the soil’s compactness and connectedness,leading to significant strength loss.The dissolution of humus acid can significantly damage the peat soil structure.The study provides valuable insights into engineering issues arising from humus acid dissolution in peat soil under alkaline environment induced by cement hydration.

关 键 词：腐殖酸 碱性环境 溶蚀性 土体损伤 水泥水化作用 

分 类 号：TU449[建筑科学—岩土工程]