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In order to determine the reasonable air-deck length in underground vertical deep-hole blasting, the internal distribution function of impact pressure on hole wall with different air-deck length in multi-stage air deck blasting was analyzed based on the detonation wave theory. According to the Mises criterion, the reasonable reference values of air-deck length were obtained for different kinds of rock, which was verified by numerical simulation and on-site blasting test. The results show that the impact pressure on the hole wall of the air deck drops abruptly from both sides to the center along the axis of the hole, but increases slightly around the midpoint, and the pressure distribution presents a symmetrical W-shaped curve, with much higher values on two sides, lower in the middle section, and slightly higher around the center.
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为确定地下垂直长深孔爆破时合理的空气间隔长度,基于爆轰波理论,分析了多段间隔装药爆破条件下孔壁冲击压力随间隔长度变化的内在分布规律函数;依据Mises准则,得出了不同岩性时合理的间隔长度参考值,并通过数值模拟和现场爆破试验进行了验证。结果表明,空气间隔段孔壁冲击压力沿炮孔轴线从两端向中间骤降,但在中点周围略微增大,压力曲线呈两端大、中间小、中点周围略微凸起的“W”形对称分布。
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1.Zijin School of Geology and Mining, Fuzhou University, Fuzhou 350108, Fujian, China
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1.福州大学 紫金地质与矿业学院,福建 福州 350108
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楼晓明(1972—),男,浙江东阳人,教授,博士,主要研究方向为爆破控制技术、采矿方法。E-mail:331261323@qq.com
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楼晓明(1972—),男,浙江东阳人,教授,博士,主要研究方向为爆破控制技术、采矿方法。E-mail:331261323@qq.com
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1.福州大学 紫金地质与矿业学院,福建 福州 350108
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| 密度ρ/(g·cm-3) | 爆速D/(m·s-1) | 爆压/(1011 Pa) | A/(1011 Pa) | B/(1011 Pa) | R1 | R2 | ω | E0/(1011 Pa) | V |
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| 0.90 | 3 000 | 0.14 | 4.71 | 0.07 | 4.05 | 0.95 | 0.30 | 0.07 | 1 |
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炸药材料参数
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| 密度ρ/(g·cm-3) | 爆速D/(m·s-1) | 爆压/(1011 Pa) | A/(1011 Pa) | B/(1011 Pa) | R1 | R2 | ω | E0/(1011 Pa) | V |
|---|
| 0.90 | 3 000 | 0.14 | 4.71 | 0.07 | 4.05 | 0.95 | 0.30 | 0.07 | 1 |
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| 密度ρ/(kg·m-3) | 剪切强度G/MPa | 完整强度系数A | 断裂强度系数B | 应变率系数C | 断裂强度指数M | 完整强度指数N |
| 2.51×103 | 6.70×103 | 0.82 | 0.28 | 5.00×10-3 | 0.63 | 0.63 |
| 参考应变率EPSI | 最大拉伸应力强度T/MPa | 标准化最大断裂强度SFMAX | Hugoniot弹性极限HEL/MPa | HEL下的压力PHEL/MPa | 体积膨胀因子β | 破坏系数D1 |
| 1.00×10-6 | 9.12 | 0.25 | 4.40×103 | 3.70×103 | 0.50 | 5.00×10-3 |
| 破坏系数D2 | 第一压力系数K1/MPa | 第二压力系数K2/MPa | 第三压力系数K3/MPa | 失效准则FS | | |
| 0.70 | 25.30×103 | -4.50×106 | 0.30×109 | 0 | | |
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岩石材料参数
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| 密度ρ/(kg·m-3) | 剪切强度G/MPa | 完整强度系数A | 断裂强度系数B | 应变率系数C | 断裂强度指数M | 完整强度指数N |
| 2.51×103 | 6.70×103 | 0.82 | 0.28 | 5.00×10-3 | 0.63 | 0.63 |
| 参考应变率EPSI | 最大拉伸应力强度T/MPa | 标准化最大断裂强度SFMAX | Hugoniot弹性极限HEL/MPa | HEL下的压力PHEL/MPa | 体积膨胀因子β | 破坏系数D1 |
| 1.00×10-6 | 9.12 | 0.25 | 4.40×103 | 3.70×103 | 0.50 | 5.00×10-3 |
| 破坏系数D2 | 第一压力系数K1/MPa | 第二压力系数K2/MPa | 第三压力系数K3/MPa | 失效准则FS | | |
| 0.70 | 25.30×103 | -4.50×106 | 0.30×109 | 0 | | |
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| 岩石种类 | 普氏系数 | 单轴抗压强度/MPa | 空气间隔长度/m | 不耦合系数 |
|---|
| 不坚固岩石 | 0.8~3 | 8≤σc≤30 | 2.0~1.4 | 1.6~1.8 |
| 中等坚固岩石 | 4~6 | 40<σc≤60 | 1.4~1.0 | 1.4~1.6 |
| 较坚硬岩石 | 6~8 | 60<σc≤80 | 1.0~0.6 | 1.3~1.4 |
| 坚硬岩石 | 8~10 | 80<σc≤100 | 0.6~0.4 | 1.2~1.3 |
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不同种类岩石合理的轴向空气间隔长度
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| 岩石种类 | 普氏系数 | 单轴抗压强度/MPa | 空气间隔长度/m | 不耦合系数 |
|---|
| 不坚固岩石 | 0.8~3 | 8≤σc≤30 | 2.0~1.4 | 1.6~1.8 |
| 中等坚固岩石 | 4~6 | 40<σc≤60 | 1.4~1.0 | 1.4~1.6 |
| 较坚硬岩石 | 6~8 | 60<σc≤80 | 1.0~0.6 | 1.3~1.4 |
| 坚硬岩石 | 8~10 | 80<σc≤100 | 0.6~0.4 | 1.2~1.3 |
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