地冲击下新型脆断构件防护性能实验研究

周宏元 杜文钊 王小娟 张雪健 余尚江 张宏

周宏元, 杜文钊, 王小娟, 张雪健, 余尚江, 张宏. 地冲击下新型脆断构件防护性能实验研究[J]. 爆炸与冲击, 2022, 42(7): 075101. doi: 10.11883/bzycj-2022-0044
引用本文: 周宏元, 杜文钊, 王小娟, 张雪健, 余尚江, 张宏. 地冲击下新型脆断构件防护性能实验研究[J]. 爆炸与冲击, 2022, 42(7): 075101. doi: 10.11883/bzycj-2022-0044
ZHOU Hongyuan, DU Wenzhao, WANG Xiaojuan, ZHANG Xuejian, YU Shangjiang, ZHANG Hong. Experimental study on the protective performance of a new brittle component subjected to ground shock[J]. Explosion And Shock Waves, 2022, 42(7): 075101. doi: 10.11883/bzycj-2022-0044
Citation: ZHOU Hongyuan, DU Wenzhao, WANG Xiaojuan, ZHANG Xuejian, YU Shangjiang, ZHANG Hong. Experimental study on the protective performance of a new brittle component subjected to ground shock[J]. Explosion And Shock Waves, 2022, 42(7): 075101. doi: 10.11883/bzycj-2022-0044

地冲击下新型脆断构件防护性能实验研究

doi: 10.11883/bzycj-2022-0044
基金项目: 国家自然科学基金(51778028,51808017);国家重点研发计划(2019YFD1101005)
详细信息
    作者简介:

    周宏元(1981- ),男,博士,教授,hzhou@bjut.edu.cn

    通讯作者:

    王小娟(1982- ),女,博士,副教授,xiaojuanwang@bjut.edu.cn

  • 中图分类号: O383.2

Experimental study on the protective performance of a new brittle component subjected to ground shock

  • 摘要: 为对地冲击作用下地下结构进行有效防护,提出一种泡沫混凝土材质的新型防护构件。与使用实心泡沫混凝土层的防护机理不同,本文中提出的构件在地冲击作用下,首先发生脆断破坏,然后破碎块体间搭接折断、挤压密实。通过构造设计,截断地冲击荷载,减弱荷载传递,改变被保护结构上的荷载形式。通过场地爆炸实验对比了不同防护措施下(无防护、实心泡沫混凝土层防护及新型构件防护)被保护结构的动力响应。实验结果表明:新型构件防护通过脆断、破碎块体的搭接、挤压密实表现出较实心泡沫混凝土层防护更好的防护效果;新型构件防护由于脆断特性,在较小荷载下即可显著削弱荷载传递,避免了实心泡沫混凝土层防护中负效果的出现;地冲击荷载较强时,构件防护层趋于压实,其防护效果逐渐接近实心泡沫混凝土层。
  • 图  1  新型防护构件

    Figure  1.  The proposed new protective component

    图  2  新型构件的准静态力-位移曲线

    Figure  2.  Force-displacement curve of a new protective component under quasi-static compression

    图  3  脆断后新型构件与传统泡沫混凝土层的力-位移曲线对比

    Figure  3.  Comparison of force-displacement curves between a fractured new protective component anda foam concrete layer under quasi-static compression

    图  4  密度为450 kg/m3的泡沫混凝土的应力-应变关系

    Figure  4.  Stress-strain curve of the foam concrete with the density of 450 kg/m3

    图  5  新型构件防护层布置示意图

    Figure  5.  Schematic layout of the new protective layer

    图  6  实验所用基坑示意图

    Figure  6.  Schematic of the experimental pit

    图  7  新型构件防护层的排布

    Figure  7.  Layout of the new protective component layer

    图  8  实验设计示意图

    Figure  8.  Illustration of the experimental setup

    图  9  不同防护情况的钢盒

    Figure  9.  Steel boxes with different protection conditions

    图  10  传感器布置

    Figure  10.  Sensor layout

    图  11  工况1的加速度时程

    Figure  11.  Acceleration time histories in case 1

    图  12  工况1 D处的应变时程

    Figure  12.  Strain time histories at position D in case 1

    图  13  工况1 中B处的应变时程

    Figure  13.  Strain time histories at position B in case 1

    图  14  工况2的加速度时程

    Figure  14.  Acceleration time histories in case 2

    图  15  工况2中C处的应变时程

    Figure  15.  Strain time histories at position C in case 2

    图  16  工况3中D处的应变时程

    Figure  16.  Strain time histories at position D in case 3

    图  17  工况3中实验后泡沫混凝土层形态

    Figure  17.  The foam concrete layer after explosion in case 3

    图  18  工况3中实验后新型构件层形态

    Figure  18.  The protective component layer after explosion in case 3

    图  19  工况2中实验后新型构件层形态

    Figure  19.  The protective component layer after explosion in case 2

    表  1  钢的性质

    Table  1.   Properties of steel

    钢材密度/(kg·m−3)杨氏模量/GPa屈服强度/MPa抗拉强度/MPa伸长率/%
    Q235B7 83021023537521
    下载: 导出CSV

    表  2  爆炸工况

    Table  2.   Explosion cases

    编号装药质量/g爆距/mm埋深/mm细砂密度/(kg·m−3)细砂波阻抗/(kg·m−2·s−1)衰减系数
    11005005001 4501.3×1053.25
    22005005001 8005.4×1053.25
    32003504501 8005.4×1053.25
    下载: 导出CSV

    表  3  工况2中不同防护手段下加速度峰值的比较

    Table  3.   Peak accelerations under protecitve methodsin case 2

    防护情况加速度峰值/(m·s−2)增量比/%
    无防护3 9530
    泡沫混凝土层防护2 506−36.6
    新型脆断构件防护1 671−57.7
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-27
  • 修回日期:  2022-05-23
  • 网络出版日期:  2022-05-30
  • 刊出日期:  2022-07-25

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