期刊文献+

交通荷载作用下焦作地区饱和粉质黏土变形特性及影响因素分析 预览

Deformation Characteristics and Influencing Factors of Saturated Silty Clay under Traffic Load in Jiaozuo Area
在线阅读 下载PDF
分享 导出
摘要 为研究焦作地区长期交通荷载作用下典型饱和粉质黏土变形特性,利用动三轴试验方法对原状粉质黏土进行单样逐级和多样恒定幅值动力加载试验,从应变-振动次数变化曲线、动应力-应变滞回曲线 2个方面重点分析了动应力、围压、固结方式以及振动频率对土体变形的影响。结果表明:焦作地区典型粉质黏土动应变随振动次数变化模式主要分为稳定型和破坏型,很少出现临界型;单样逐级加载会使土体强度增大,结构产生破坏所需的动应力幅值升高,平行多样恒定幅值加载中试样破坏前后可能存在一个明显的临界动应力值,动应力超过临界值后,试样变形急剧增长,低振动次数内便产生破坏;围压、固结比增大都会使土体强度升高,产生的可恢复弹性变形减小;振动频率对土体变形的影响可能存在一个临界频率值,在这个值前后土体变形都会增大。研究成果对保证研究区交通设施的安全运营具有重要意义。 The deformation characteristics of typical saturated silty clay under long-term traffic load in Jiaozuo area were investigated through dynamic triaxial tests on single undisturbed specimen under multistage loading and parallel specimens under constant amplitude of loading. By analyzing the strain-vibration curve and dynamic stress-strain hysteretic curves, the influences of dynamic stress, confining pressure, consolidation mode, and vibration frequency on soil deformation were examined. The following conclusions were obtained: the development mode of dynamic strain of typical silty clay in Jiaozuo can be mostly summarized as steady mode and destructive mode-dynamic strain grew steadily at a certain stress level and developed to failure when that stress level was exceeded-rather than critical mode. The strength of single soil specimen intensified under step-by-step loading, and the dynamic stress level required to result in failure increased correspondingly. As for multiple specimens under constant amplitude of loading, the deformation surged until failure happened even in the presence of low vibration frequency when dynamic stress exceeded a critical value. In addition, the increment of confining pressure and consolidation ratio could also raise the soil strength, with less recoverable elastic deformation. When vibration frequency was smaller or larger than a critical value, the deformation of soil both increased.
作者 李金秋 王秀艳 刘长礼 孙琳 LI Jin-qiu;WANG Xiu-yan;LIU Chang-li;SUN Lin(Institute of Hydrogeology and Environmental Geology of Chinese Academy of Geological Sciences,Shijiazhuang 050061,China)
出处 《长江科学院院报》 CSCD 北大核心 2019年第7期70-76,82共8页 Journal of Yangtze River Scientific Research Institute
基金 中国地质调查局地质调查项目(121201236000160018) 国家自然科学基金面上项目(41272301) 中国地质科学院基本科研业务费项目(YYWF201628).
关键词 粉质黏土 变形 交通荷载 动三轴试验 固结比 振动频率 滞回曲线 silty clay deformation traffic load dynamic triaxial test consolidation ratio vibration frequency hysteretic curve
作者简介 李金秋(1989-),男,河北保定人,研究实习员,硕士,主要从事岩土体灾害及其防治研究。E-mail:316145333@qq.com;通信作者:王秀艳(1964-),女,黑龙江齐齐哈尔人,研究员,博士,主要从事地质灾害研究。E-mail:1615319609@qq.com.
  • 相关文献
投稿分析

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈