Damage Evolution and Dynamic Response of Anchorage Caverns with a Crack under Top Explosion
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摘要: 基于相似模型试验，利用数值分析方法研究了含裂隙锚固洞室在顶爆下的损伤演化和动态响应规律，并探讨了裂隙倾角和长度对锚固洞室损伤分布和拱顶位移的影响。随着爆炸应力波的传播，在裂隙表面形成张拉损伤，并在裂隙尖端扩展出翼生裂纹，随后在锚固洞室附近的拱顶自由面、锚固区边界处以及底板中间依次形成较大拉伸损伤区域。随着裂隙倾角从0°加大到90°，拱顶锚固区及锚固区边界最大损伤区域面积先减小后增加，裂隙倾角为45°时面积最小。当裂隙的长度相同时，拱顶峰值位移随裂隙倾角的增大先增加后减小；当裂隙的倾角相同时，裂隙长度越长对应力波的阻碍作用越明显，裂隙长度为30 cm、倾角为45°时洞室破坏最小。Abstract: Based on the similar model test, the damage evolution and dynamic response law of anchored caverns with a crack under top explosion was studied by numerical analysis, and the influence of crack angle and length on the damage distribution and crown displacement of the anchor caverns was discussed.With the propagation of the explosion stress waves, tensile damage is formed on the surface of the fracture, and a winged crack extends at the tip of the fracture.Subsequently, a large tensile damage zone was formed successively at the vault free surface near the anchoring cavern, at the boundary of the anchoring zone, and in the middle of the floor.As the crack angle increases from 0° to 90°, the area of the largest damage zone at the boundary of the anchorage zone and the anchorage zone first decreases and then increases, and the area at the crack inclination angle of 45° is the smallest.When the cracks have the same length, the peak displacement of the crown increases first and then decreases with the increase of the crack dip angle.When the fracture angle is the same, the longer the crack length is, the more obvious the obstruction of the stress wave is, and the damage of the cavern with the facture 30 cm in length and 45° in inclination angle under top explosion is minimal.
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Key words:
- underground engineering /
- blast loads /
- anchorage caverns /
- opening crack /
- damage evolution /
- numerical analysis
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图 3 模拟、实测压应力时程曲线对比
Figure 3. Comparison of simulated time-history curve of pressure with the experimental data
图 9 不同长度裂隙洞室拱顶峰值位移
Figure 9. Peak vault displacements of caverns with different fracture lengths
表 1 CDP模型参数
Table 1. Parameters of CDP model
Density/(kg·m-3) E/GPa μ Dilation angle/(°) Eccentricity σb0/σc0 K Viscosity paramenter 1800 2.03 0.16 25 0.1 1.16 0.66667 0 
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