• BLASTING
  • Vol. 38, Issue 2, 73 (2021)
HU Fang-qiang1、*, ZHANG Chun-yang2, TAN Hai2, JIANG Ting-ting2, and KABILA Kevin Mbuyu2
Author Affiliations
  • 1[in Chinese]
  • 2[in Chinese]
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    DOI: 10.3963/j.issn.1001-487x.2021.02.011 Cite this Article
    HU Fang-qiang, ZHANG Chun-yang, TAN Hai, JIANG Ting-ting, KABILA Kevin Mbuyu. Study on Blasting Vibration Measurement and Influence on Villagers′ Houses Safety in South Mining Area of Tianjiacun South Stope in Baima Iron Mine[J]. BLASTING, 2021, 38(2): 73 Copy Citation Text show less

    Abstract

    In order to ascertain the impact of vibration on the villagers′ houses caused by bench blasting in south mining area of Tianjiacun south stope in Baima Iron Mine, combined with location of the houses, current situation of open-pit, geology and geomorphology characteristics, and the heterogeneity of rock and soil mass, the blasting vibration measurement was studied with the L20 series intelligent blasting vibration measuring instrument.After that, the least square method was used to carry out regression analysis on the data to obtain the corresponding values K, α values and the attenuation law of blasting vibration velocity in each direction, respectively.It can be seen that the validation results reflect the reliability of regression values of K and α.Furthermore, the vibration velocity of 1525 m, 1540 m and 1555 m Benches in south stope of Tianjiacun village from July 2019 to October 2020 were calculated in reverse.Among them, the maximum vibration velocity is 0.33 cm/s located in the Z direction, which provided a basis for evaluating the impact of blasting vibration on the houses.The results show that the blasting vibration velocities of the measuring points are no more than the permittable safety blasting vibration range of “earth cave, adobe house, stone house” and “general civil buildings” in 《blasting safety regulations(GB672—2014)》.However, it is necessary to consider the long-term impact of blasting vibration on adobe house, as well as the decoration, exterior wall tiles, plaster layer, and other non-load-bearing structures of brick-concrete buildings, and take the field investigation as the criterion.However, it does not affect the safety of the load-bearing structure of brick-concrete buildings.In addition, combined with the design data, the blasting vibration velocity in the future is predicted, the maximum value is 0.54 cm/s in the Z direction, which exceeds the safety vibration standard of “earth cave, adobe house, stone house”(0.45 cm/s, f≤10 Hz).However, it is still lower than the safety allowable blasting vibration standard of “general civil buildings”(2.0 cm/s, f≤10 Hz).Finally, some suggestions are proposed, such as reducing single hole charge and promoting the application of digital electronic detonator.
    HU Fang-qiang, ZHANG Chun-yang, TAN Hai, JIANG Ting-ting, KABILA Kevin Mbuyu. Study on Blasting Vibration Measurement and Influence on Villagers′ Houses Safety in South Mining Area of Tianjiacun South Stope in Baima Iron Mine[J]. BLASTING, 2021, 38(2): 73
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