冲击载荷作用下含双椭圆缺陷花岗岩的动态断裂行为研究
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作者单位:

1.中国矿业大学(北京);2.成都理工大学

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O346.1

基金项目:

国家自然科学基金(51974318,52174094);国家重点研发( 2021YFC2902103);


Dynamic fracture behavior of granite with double elliptical defects under impact load
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CHINA UNIVERSITY OF MINING AND TECHNOLOGY-BEIJING

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    摘要:

    为研究含双椭圆缺陷花岗岩的破坏形态及能量耗散规律,利用分离式霍普金森杆(SHPB)装置,分别对双椭圆缺陷夹角为0°、45°、90°、135°的花岗岩试件进行了动态劈裂拉伸实验,探讨了双椭圆缺陷夹角、缺陷间距与花岗岩破坏形态及能量之间的关系。结果表明:双椭圆缺陷间距不变时,夹角越大,试件越容易断裂;夹角不变时,间距增大,岩样更容易断裂。试件的耗散能密度随夹角的增大而降低,且下降趋势逐渐趋于平缓。试件的破坏形态对夹角的敏感程度较高,即随着夹角的增大,岩样破碎程度逐渐加剧,碎块对称性消失,楔体效应逐渐明显,塑性增强;当夹角超过90°时,破碎程度又开始减小,岩样又呈对称断裂。。

    Abstract:

    In order to study the failure mode and energy dissipation law of granite with double elliptical defects, dynamic splitting tensile experiments were conducted on granite with double elliptical defect angles of 0°, 45°, 90°, and 135° using a split Hopkinson bar (SHPB) device. The relationship between the angle and spacing of double elliptical defects, as well as the failure morphology and energy of granite, was explored. The results show that when the distance between double elliptical defects remains constant, the larger the included angle, the easier the specimen is to fracture. When the angle remains constant, the spacing increases and the rock sample is more prone to fracture. The dissipated energy density of the specimen decreases with the increase of the included angle, and the downward trend gradually tends to be gentle. The failure mode of the specimen is highly sensitive to the angle, that is, as the angle increases, the degree of fragmentation of the rock sample gradually intensifies, the symmetry of the fragments disappears, the wedge effect gradually becomes obvious, and the plasticity increases. When the included angle exceeds 90 °, the degree of fragmentation begins to decrease again, and the rock sample exhibits symmetrical fracture.

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徐胜男,彭麟智. 冲击载荷作用下含双椭圆缺陷花岗岩的动态断裂行为研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2023-11-07
  • 最后修改日期:2024-06-28
  • 录用日期:2024-07-09
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