干湿循环效应固化黄土宏-微观演化特征函数  

Macro-micro Evolution Characteristic Function of Solidified Loess under the Effects of Dry-wet Cycles

作　　者：焦远帆 晏长根[1] 常洲 贾卓龙 章一博 梁哲瑞 张家辉 JIAO Yuanfan;YAN Changgen;CHANG Zhou;JIA Zhuolong;ZHANG Yibo;LIANG Zherui;ZHANG Jiahui(School of Highway,Chang′an University,Xi′an 710064,China)

机构地区：[1]长安大学公路学院,西安710064

出　　处：《水土保持学报》2025年第1期303-315,共13页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(42077265,41927806)。

摘　　要：[目的]为探讨生态护坡材料的长期服役耐久性。[方法]通过干湿循环条件下的力学试验和渗透试验,研究固化黄土宏观性能的演化规律,利用扫描电镜和图像处理技术,分析干湿循环对微结构形态的损伤规律,探讨生物胶改善黄土宏观性能干湿循环耐久性的微观机理,并基于宏观性能指标和微结构参数建立宏-微观演化特征函数,描述干湿循环条件下宏观性能与微观结构间的数值响应关系。[结果]生物胶抑制固化黄土力学性质劣化,抑制效果与生物胶掺量呈正相关,生物胶增大固化黄土的渗透性能变化,变化幅度与掺量呈负相关;干湿循环造成黄土胶结作用失效,颗粒损伤,孔隙增大,生物胶增强黄土胶结作用,减缓颗粒损伤,改变孔隙发育模式;演化特征函数预测效果良好,超过95%的预测点落在均方误差线以内。生物胶的加入有利于改善黄土宏观性能的干湿循环耐久性;特征函数的敏感性分析表明,孔隙率对力学性能影响最大,孔径>32μm的大孔隙率对渗透性能影响最大。[结论]研究结果可为生物胶固化土护坡技术的工程应用及后续改良提供理论依据。[Objective]To reveal the durability of solidified loess slope protection in long-term service.[Methods]Under the condition of dry-wet cycles,direct shear,permeability mechanical tests of solidified loess were carried out to study the evolution law of the macro-properties of stabilized loess,and the damage law of dry-wet cycles on the morphology of the microstructure was analyzed by using scanning electron microscopy and image processing technology.The micro-mechanism of improvement of the dry-wet cycle durability of the macro-properties of loess by biological glue was discussed,and the macro-micro-evolution feature function was established based on the macro-performance index and the micro-structure view parameters to describe the numerical response relationship between the macro-properties and the micro-structure under the dry-wet cycle conditions.[Results]The biological glue inhibited the deterioration of mechanical properties of solidified loess,and the inhibitive effect was positively correlated with the content of biological glue;the change of permeability of solidified loess was increased by biological glue,and the change amplitude was negatively correlated with the content of biological glue.The dry-wet cycles resulted in the failure of loess cementation,particle damage and pore increase.The biological glue enhanced the loess cementation,slowed down the particle damage and changed the pore development pattern.More than 95%of the predicted points fell within the mean square error line.The addition of biological glue could improve the durability of the macroscopic properties of loess under dry-wet cycles.The sensitivity analysis of the characteristic function showed that the porosity had the greatest influence on the mechanical properties,and the large porosity with pore size>32μm had the greatest influence on the permeability.[Conclusion]The research findings can provide a theoretical basis for the engineering application of biological glue for the technology of soil solidification and slope protection and

关 键 词：固化黄土 干湿循环 抗剪强度 渗透性 微观结构 预测模型 

分 类 号：TU444[建筑科学—岩土工程]