Anti-detonation property of reinforcement rock
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摘要: 为进一步提升岩体的抗爆炸性能，采用相似模型实验和数值模拟的方法对采用交叉锚索进行加固的围岩进行了抗爆性能分析，对比分析了加固前后岩体的爆炸压力分布规律、应变分布规律、爆腔大小以及锚索参数对加固效果的影响。研究结果表明：无论岩体是否加固，爆心附近岩体内爆炸压力峰值、径向应变峰值、环向应变峰值与比例距离均呈负幂指数衰减，在相同的爆炸药量作用下，随着距爆点距离的增大，压力、应变峰值迅速减小；在集团装药条件下，岩体内的爆腔不呈球形而呈上细下粗的花瓶形，且无加固岩体的爆腔高度较大；交叉锚索角度变化对介质压缩半径的影响较小；随着交叉锚索密度的增大，加固介质中自由场压缩波峰值降低约20%～35%左右，介质的破坏半径小约30%左右。该研究结果可为地下防护工程设计和围岩加固提供参考。Abstract: To improve the anti-detonation property of surrounding rock, the surrounding rock reninforced by crossing cable method was proposed, and the effects of the method were analyzed by anology experiments and numerical simulation. The d pressure and strain distributions under detonation, explosion cavity dimensions and reinforcing cable parameters on strengthening effects were investigated. The results indicate that the detonation pressure peak value near the detonation center, radial strain peak value and circumferential strain peak value are all negative exponential decay with the proportional distance, no matter the rock is strengthened or not. Under the focus point explosion, the pressure and peak strain rapidly decrease with the distance apart from the detonation point. Under the concentrated charging case, the explosion cavity displays as a vase with the thin head part and fat bottom part. The explosion cavity of the magmatic body without strengthening is comparatively large. The influences of reinforced crossing cable angle on medium compression radius is limited. With the increase of the density of the reinforced crossing cable, the peak value of the compression wave in the strengthened medium decreases about 20%-35% and the destruction radius decreases about 30%. The results of this paper can provide references to the underground protective engineering design and enclosing rock strengthening.
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Key words:
- anti-detonation property /
- model test /
- reinforcement /
- anchor cable /
- explosion cavity
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图 3 应变和压力测点布置（单位：mm）
Figure 3. Measuring location arrangement of stress and pressure (unit: mm)
图 5 未加固模型药量为100 g实验结果
Figure 5. Test results of unreinforcement under 100 g explosive load
图 7 径向应变峰值与比例距离的关系曲线
Figure 7. Radial peak strain-proportion distance curve of explosion
图 8 环向应变峰值与比例距离的关系曲线
Figure 8. Toroidal peak strain-proportion distance curve of explosion
表 1 原岩与选定模拟材料物理力学参数
Table 1. Mechanics parameters of the rock and selected material
围岩级别 Rc/MPa Rt/MPa C/MPa φ/(°) Em/GPa μ ρ/(kg·m−3) 原岩（Ⅲ） 30 0.83～1.4 0.7～1.5 35～45 6.0～20 0.20～0.25 2 500 选定的模型材料 2.56 0.43 1.5 41 5.2 0.15 1 820 
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表 2 钢绞线与选定铝绞线力学参数
Table 2. The mechanics parameters of cable and selected aluminium stranded wire
锚索类型 E/GPa Rt/MPa 规格 R/mm A/mm2 钢绞线(原型) 196 1 860 3束7×∅5 mm 23.05 417 铝绞线(模型) 62.6 170 3×∅1.5 mm 2.6 5.3
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表 3 数值模型参数
Table 3. Parameters of numerical model
角度/(°) ρ/(kg·m−3) E/GPa μ Rc/MPa Rt/MPa C/MPa φ/(°) 无加固 1 800 0.386 0.25 3 0.267 0.6 36 45 2 000 0.735 0.25 3 0.497 0.8 41 30 2 000 0.70 0.25 3 0.803 0.85 39 60 2 000 0.78 0.25 3 0.320 0.75 45 注：角度指锚索与水平线之间角度。
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表 4 数值模拟计算方案
Table 4. The proposal of the numerical simulations
编号 ρm E/GPa φ/(°) C/MPa Rt/MPa Cm/(°) Ry/mm M1 0.1 m×0.1 m 0.700 39 0.85 0.803 30 241 M2 0.1 m×0.1 m 0.735 41 0.80 0.497 45 251 M3 0.1 m×0.1 m 0.780 45 0.75 0.320 60 258 M4 0.07 m×0.07 m 0.700 41 0.80 0.75 45 222 M5 0.15 m×0.15 m 0.780 41 0.80 0.35 45 278
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