宁夏滨河路基盐渍化粉土的动力特性  

Dynamic Characteristics of Saline Silt in the Road Base along Binhe Road in Ningxia

作　　者：马文国 张刚 封少博 杨有贞 董旭光 MA Wenguo;ZHANG Gang;FENG Shaobo;YANG Youzhen;DONG Xuguang(School of Civil and Hydraulic Engineering,Ningxia University,Yinchuan 750021,China;Academic Journal Center,Ningxia University,Yinchuan 750021,China;College of Life Sciences,Yulin University,Yulin 719000,China)

机构地区：[1]宁夏大学土木与水利工程学院,宁夏银川750021 [2]宁夏大学学术期刊中心,宁夏银川750021 [3]榆林学院生命科学学院,陕西榆林719000

出　　处：《宁夏工程技术》2023年第4期320-327,336,共9页Ningxia Engineering Technology

基　　金：国家自然科学基金项目(51768059);宁夏自然科学基金项目(2021AAC03095,2022AAC03106);宁夏回族自治区重点研发计划项目(2021BEG03023)。

摘　　要：宁夏滨河大道使用盐渍化粉土作为路堤,由于超载和地质等原因,路面基层出现翻浆和沉陷等病害。以滨河路基的盐渍化粉土为研究对象,开展了路基粉土在含盐和不含盐两种条件下的动荷载试验,分析了盐分对路基粉土的影响。首先,总结了路基的病害特点,分析了路基所处的水文地质环境。其次,将路基盐渍化粉土按化学成分、含盐量和场地类型进行了分类。最后,对滨河路基盐渍化粉土进行了洗盐处理,分别对盐渍粉土和洗盐粉土进行动荷载测试,动荷载分为逐级加载和恒定加载两种双向剪切的动荷载,对比了两种土样在逐级加载条件下的滞回曲线、骨干曲线、滞回曲线面积、动弹性模量和阻尼比,以及在恒定加载条件下的滞回曲线、滞回曲线面积、双向动应变幅值和超静孔隙水压力。结果表明:洗盐土较盐渍土具有较高的抗剪强度和抵抗变形的能力,在滨河盐渍化区域修建路基应做好盐分迁移设计。Saline silt is used as the roadbed material for Binhe Avenue in Ningxia.Due to overloading and geological reasons,diseases such as frost boiling and subsidence have occurred in the pavement base layer.Taking the saline silt of the Binhe roadbed as the research object,dynamic load tests under two conditions,with and without salt content,were conducted to analyze the impact of salt content on the roadbed silt.Firstly,the disease characteristics of the roadbed were summarized,and the hydrogeological environment in which the roadbed is located was analyzed.Secondly,the roadbed saline silt was classified according to its chemical composition,salt content,and site type.Finally,the saline silt from Binhe was desalinated,and dynamic load tests were conducted on both the saline silt and the desalinated silt.The dynamic loads were divided into two types of cyclic shear:incremental loading and constant loading.The hysteresis curves,backbone curves,hysteresis loop areas,dynamic modulus of elasticity,and damping ratio under incremental loading were compared,as well as the hysteresis curves,hysteresis loop areas,bidirectional dynamic strain amplitudes,and excess static pore water pressure under constant loading.The results showed that the desalinated soil has higher shear strength and resistance to deformation than the saline soil,and that salt migration design should be well considered when constructing roadbeds in saline areas of Binhe.

关 键 词：滨河粉土 盐渍化 洗盐 逐级加载 恒定动载 

分 类 号：TU435[建筑科学—岩土工程]