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考虑时间间歇效应的粉土动力特性

聂如松 董俊利 梅慧浩 冷伍明 李亚峰 程龙虎

聂如松, 董俊利, 梅慧浩, 冷伍明, 李亚峰, 程龙虎. 考虑时间间歇效应的粉土动力特性[J]. 西南交通大学学报, 2021, 56(5): 1125-1134. doi: 10.3969/j.issn.0258-2724.20190642
引用本文: 聂如松, 董俊利, 梅慧浩, 冷伍明, 李亚峰, 程龙虎. 考虑时间间歇效应的粉土动力特性[J]. 西南交通大学学报, 2021, 56(5): 1125-1134. doi: 10.3969/j.issn.0258-2724.20190642
NIE Rusong, DONG Junli, MEI Huihao, LENG Wuming, LI Yafeng, CHENG Longhu. Dynamic Characteristics of Silt Considering Time Intermittent Effect[J]. Journal of Southwest Jiaotong University, 2021, 56(5): 1125-1134. doi: 10.3969/j.issn.0258-2724.20190642
Citation: NIE Rusong, DONG Junli, MEI Huihao, LENG Wuming, LI Yafeng, CHENG Longhu. Dynamic Characteristics of Silt Considering Time Intermittent Effect[J]. Journal of Southwest Jiaotong University, 2021, 56(5): 1125-1134. doi: 10.3969/j.issn.0258-2724.20190642

考虑时间间歇效应的粉土动力特性

doi: 10.3969/j.issn.0258-2724.20190642
基金项目: 国家自然科学基金(51878666,51678572);中国铁路太原局集团有限公司科技研究开发计划(A2019G03);中国铁路总公司系统性重大项目(P2018X011)
详细信息
    作者简介:

    聂如松(1980—),男,副教授,博士,研究方向为铁路路基及桥梁桩基础工程,E-mail:nierusong97@csu.edu.cn

  • 中图分类号: U213.1

Dynamic Characteristics of Silt Considering Time Intermittent Effect

  • 摘要: 列车荷载是揭示路基真实动力响应特性的前提,以往的动三轴试验将列车荷载视为连续动荷载,忽略了追踪列车间隔时间对路基土体动力特性的影响. 利用室内动三轴仪对粉土开展了连续加载和间歇加载(连续加载与间歇交替循环)的动三轴试验,分析了两种加载方式下粉土超孔隙水压力、回弹模量、累积塑性应变等的发展规律. 研究结果表明:持续动荷载作用下累积的超孔隙水压力在间歇阶段会发生消散,轴向应变在间歇阶段得到一定程度恢复,进而提高了试样抵抗变形的能力;室内动三轴试验忽略间歇效应将高估列车动荷载作用下试样超孔压和塑性应变的累积量及发生破坏的可能性;间歇加载下试样的永久变形行为可依据安定理论划分为塑性安定、塑性蠕变和增量破坏.

     

  • 图 1  颗粒级配曲线

    Figure 1.  Grain grading curve

    图 2  DDS-70微机控制动三轴仪

    Figure 2.  DDS-70 microcomputer controlled dynamic triaxial apparatus

    图 3  轴向应力时程示意

    Figure 3.  Schematic diagram of axial stress time history

    图 4  连续加载轴向应变时程曲线

    Figure 4.  Time history curves of axial strain under continuous loading

    图 5  连续加载条件下超孔压时程曲线

    Figure 5.  Time-history curves of overpressure under continuous loading

    图 6  间歇加载下轴向应变时程曲线

    Figure 6.  Time history curves of axial strain under intermittent loading

    图 7  间歇加载条件下超孔压时程曲线

    Figure 7.  Time history curves of excess pore water pressure under intermittent loading

    图 8  动应力-动应变关系曲线

    Figure 8.  Dynamic stress-strain curves

    图 9  回弹模量Mr随振次的变化曲线

    Figure 9.  Variation curves of rebound modulus Mr with vibration frequency

    图 10  累积塑性应变随振次的变化

    Figure 10.  Variation of cumulative plastic strain with vibration frequency

    图 11  间歇加载下应变随时间的关系

    Figure 11.  Relationship between strain and time under intermittent loading

    图 12  加载阶段累积的塑性应变与间歇阶段的回弹应变情况

    Figure 12.  Cumulative plastic strain in loading stage and rebound strain in intermittent stage

    图 13  间歇加载方式下累积塑性应变随循环振次关系曲线

    Figure 13.  Relationship curves between cumulative plastic strain and cyclic vibration times under intermittent loading

    图 14  不同动力行为临界应力的估算公式

    Figure 14.  Estimation formula of critical stress for different dynamic behaviors

    表  1  低液限粉土的基本物理参数

    Table  1.   Basic physical parameters of silt with low liquid limit

    颗粒密度/(g•cm−3最大干
    密度/(g•cm−3
    最优
    含水率/%
    饱和
    含水率/%
    塑限/%塑性
    指数
    渗透系数k/(cm•s−1
    2.711.9611.8019.7518.27.81.238 × 10−7
    下载: 导出CSV

    表  2  动三轴试验方案

    Table  2.   Test scheme of dynamic triaxial kPa

    试验序列试验类型σ3σd
    1连续加载6030,60
    23030,60,90
    3分阶段循环加载6030,60,90,120
    49030,60,90,120,150
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-08-06
  • 修回日期:  2020-05-06
  • 网络出版日期:  2020-06-03
  • 刊出日期:  2021-10-15

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