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大型船闸开挖预裂爆破累积损伤特性及隔振效果分析

胡浩然 周海孝 张玉柱 李冬冬 张宸

胡浩然,周海孝,张玉柱,等. 大型船闸开挖预裂爆破累积损伤特性及隔振效果分析[J]. 水利水运工程学报. doi:  10.12170/20211118003
引用本文: 胡浩然,周海孝,张玉柱,等. 大型船闸开挖预裂爆破累积损伤特性及隔振效果分析[J]. 水利水运工程学报. doi:  10.12170/20211118003
(HU Haoran, ZHOU Haixiao, ZHANG Yuzhu, et al. Analysis of damage accumulating characteristics and vibration isolating effect of presplitting blasting in the excavation of the large-scale navigation lock[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211118003
Citation: (HU Haoran, ZHOU Haixiao, ZHANG Yuzhu, et al. Analysis of damage accumulating characteristics and vibration isolating effect of presplitting blasting in the excavation of the large-scale navigation lock[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211118003

大型船闸开挖预裂爆破累积损伤特性及隔振效果分析

doi: 10.12170/20211118003
基金项目: 陕西省自然科学基础研究计划资助项目(2021JQ-258);中央高校基本科研业务费专项基金资助项目(300102210123)
详细信息
    作者简介:

    胡浩然(1991—),男,安徽舒城人,工程师,博士,主要从事岩土工程设计相关工作。E-mail:huhaoran@cjwsjy.com.cn

    通讯作者:

    周海孝(E-mail:hxzhou@chd.edu.cn

  • 中图分类号: TU45

Analysis of damage accumulating characteristics and vibration isolating effect of presplitting blasting in the excavation of the large-scale navigation lock

  • 摘要: 针对大型船闸预裂爆破开挖时中隔墩振动与损伤控制的问题,依托现场爆破试验,对比分析了不同段主爆孔诱发振动的峰值,采用数值模拟的方式,研究了不同段主爆孔的爆破累积损伤特性,分析了不同损伤范围下预裂缝的隔振效果,并对船闸爆破开挖方案进行了优化。研究结果表明:预裂爆破开挖中主爆孔爆破会对预裂缝附近岩体产生累积损伤,但会增强对后续主爆孔的隔振效果;随着预裂缝附近岩体累积损伤的增加,其隔振效果逐渐增强,并最终稳定在50%左右;爆破振动峰值(PPV)衰减幅度随着损伤宽度的增加而增加,当损伤宽度达到4 cm后,衰减幅度趋于平缓。大型船闸开挖中应综合考虑预裂爆破累积损伤特性及其隔振效果,可采用先拉槽增加侧向临空面与设置施工预裂缝的爆破开挖优化方案,进而保证开挖效果,并降低对保留岩体的扰动。
  • 图  1  炮孔布置(单位:m)

    Figure  1.  Layout of boreholes(unit:m)

    图  2  振动测点分布 (单位:m)

    Figure  2.  Layout of monitoring points(unit:m)

    图  3  典型测点振动时程曲线

    Figure  3.  Typical blast vibration velocity time-histories

    图  4  不同段主爆孔爆破诱发的PPV比较

    Figure  4.  Comparison of PPV induced by different rows of production boreholes

    图  5  数值计算模型 (单位: m)

    Figure  5.  Numerical model (unit: m)

    图  6  验证模型 (单位: m)

    Figure  6.  Validation numerical model (unit: m)

    图  7  计算结果与现场监测对比

    Figure  7.  Comparison of numerical and experimental results

    图  8  不同段主爆孔爆破横截面累积损伤分布

    Figure  8.  Accumulating damage at different cross section induced by different rows of production boreholes

    图  9  主爆孔爆破纵截面累积损伤分布

    Figure  9.  Accumulating damage at different longitudinal sections induced by production boreholes

    图  10  不同损伤范围下减振比例

    Figure  10.  Vibration isolation proportions under different width of damage zone

    图  11  不同损伤范围下PPV分布

    Figure  11.  PPV distribution under different width of damage zone

    图  12  拉槽爆破开挖程序示意

    Figure  12.  Illustration of excavation procedure of cutting blasting

    图  13  施工预裂爆破开挖程序示意(单位:m)

    Figure  13.  Illustration of excavation procedure of construction presplitting blasting(unit:m)

    表  1  炸药主要参数

    Table  1.   Parameters of explosive in numerical models

    密度
    /(kg·m−3)
    初始爆轰速度
    /(m·s−1)
    初始爆轰压力/GPaA1/GPaB1/GPaR1R2ω
    1 000.005 000.005.1549.401.893.901.110.33
    下载: 导出CSV

    表  2  RHT模型主要参数取值

    Table  2.   Parameters used in the RHT model for rock

    密度/(kg·m−3)体积模量/GPa剪切模量/GPa抗压强度/MPa损伤常数D1损伤常数D2完整失效面常数A完整失效面指数N
    2750.0035.2016.7035.000.041.001.600.61
    下载: 导出CSV
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