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    冷振东, 贾永胜, 卢文波, 孙金山, 谢先启. 高孔隙软岩爆破能量传输规律与爆破大块形成机制[J]. 应用基础与工程科学学报, 2024, 32(5): 1420-1433. DOI: 10.16058/j.issn.1005-0930.2024.05.016
    引用本文: 冷振东, 贾永胜, 卢文波, 孙金山, 谢先启. 高孔隙软岩爆破能量传输规律与爆破大块形成机制[J]. 应用基础与工程科学学报, 2024, 32(5): 1420-1433. DOI: 10.16058/j.issn.1005-0930.2024.05.016
    LENG Zhendong, JIA Yongsheng, LU Wenbo, SUN Jinshan, XIE Xianqi. Blasting Energy Transmission and Oversize Boulders Formation Mechanism in Soft Rock Blasting with High Porosity[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1420-1433. DOI: 10.16058/j.issn.1005-0930.2024.05.016
    Citation: LENG Zhendong, JIA Yongsheng, LU Wenbo, SUN Jinshan, XIE Xianqi. Blasting Energy Transmission and Oversize Boulders Formation Mechanism in Soft Rock Blasting with High Porosity[J]. Journal of Basic Science and Engineering, 2024, 32(5): 1420-1433. DOI: 10.16058/j.issn.1005-0930.2024.05.016

    高孔隙软岩爆破能量传输规律与爆破大块形成机制

    Blasting Energy Transmission and Oversize Boulders Formation Mechanism in Soft Rock Blasting with High Porosity

    • 摘要: 高孔隙率软岩在爆炸荷载作用下的破碎力学机制与普通岩石存在显著的差异.基于冲击动力学与爆炸力学理论,建立了考虑岩石孔隙率的爆破能量传输效率模型,理论分析表明,岩体的孔隙结构影响着爆炸能量在炸药和岩石界面间的传输,应力波的衰减随着孔隙率的增加而增大.采用数值计算研究了爆破破坏分区和爆破块度分布与孔隙率的定量关系,揭示了高孔隙软岩的爆破大块形成机制.计算结果表明,孔隙率对爆破裂纹的拓展同时存在着“促进”和“抑制”两种作用:当孔隙率较低时(ϕ<10%),对裂纹的“促进”作用占主导,爆炸能量主要消耗在固相介质破裂形成新破裂面上;当孔隙率较高时(ϕ>15%),对裂纹的“抑制”作用占主导,爆炸能量主要被消耗在孔隙变形和压溃上,在裂隙区的裂纹长度减小,细小裂纹的拓展受到抑制,导致高孔隙软岩中爆破大块的形成.研究成果有助于优化高孔隙软岩中的爆破设计,提高爆破能量利用率.

       

      Abstract: The blasting fragmentation mechanisms of high-porosity soft rock under blast loading is significantly different from that of ordinary rock.Based on the theory of impact dynamics and explosion mechanics,a blasting energy transfer efficiency model considering rock porosity was established.Theoretical analysis shows that the pore structure of the rock mass affects the explosion energy transmission between the explosive-rock interface,and the attenuation of stress waves increases with the increase of porosity.The quantitative relationship between blasting fragmentation distribution and porosity was investigated by numerical simulation.And the formation mechanism of oversize boulders in soft rock blasting with high porosity was revealed.The results show that the porosity has two different effects of “promoting” and “inhibiting” on the propagation of blasting cracks at the same time.When the porosity is low (ϕ<10%),the “promoting” effect on the crack is dominant,and the explosion energy is mainly consumed in the formation of new fracture surface.When the porosity is high (ϕ>15%),the “inhibition” effect on the crack is dominant,the explosion energy is mainly consumed in pore deformation and crushing.And the expansion of micro cracks is restrained,resulting in the formation of oversize boulders in high porosity soft rock.This study is helpful to optimize the blasting design in high porosity soft rock and improve the utilization rate of blasting energy.

       

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