不同地应力条件下切缝药包爆破的数值模拟

魏晨慧; 朱万成; 白羽; 牛雷雷

doi:10.11883/1001-1455(2016)02-0161-09

不同地应力条件下切缝药包爆破的数值模拟

doi: 10.11883/1001-1455(2016)02-0161-09

东北大学资源与土木工程学院, 辽宁沈阳 110819

基金项目:

国家自然科学基金项目 51222401

国家自然科学基金项目 51374049

国家自然科学基金项目 51304037

中央高校基本科研业务费项目 N120101001

中央高校基本科研业务费项目 N120301002

中国博士后科学基金项目 2013M541238

详细信息

作者简介:
魏晨慧(1984—)，男，博士，讲师

通讯作者:
朱万成，zhuwancheng@mail.neu.edu.cn

中图分类号: O383.2;TD235
计量
- 文章访问数: 4447
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- 被引次数: 0
出版历程
- 收稿日期: 2014-08-18
- 修回日期: 2014-11-21
- 刊出日期: 2016-03-25

Numerical simulation on cutting seam cartridge blasting under different in-situ stress conditions

School of Resource & Civil Engineering, Northeastern University, Shenyang 110819, Liaoning, China

摘要

摘要: 针对切缝药包定向爆破的特点，考虑岩石介质非均匀性的基础上，把岩石爆破视为爆炸应力波动态作用和爆生气体压力准静态作用的过程，基于损伤力学理论建立岩石爆破的力学模型，并对不同地应力条件下切缝药包爆破的裂纹演化规律进行数值模拟，分析不同地应力条件对切缝药包爆破效果的影响。模拟结果表明：采用切缝药包爆破时，裂纹主要萌生于切缝周边，沿切缝方向扩展，切缝对定向裂纹的控制作用明显；当考虑地应力作用，且最大地应力方向与切缝方向垂直时，不利于定向裂纹的扩展；最大地应力方向与切缝方向平行时，有利于定向裂纹的扩展。裂纹的扩展方向受控于切缝角度和最大地应力方向这2个条件，裂纹扩展规模则受到地应力的限制。
- 爆炸力学 /
- 地应力 /
- 爆炸应力波 /
- 爆生气体压力 /
- 侧压力系数 /
- 切缝药包爆破
Abstract: Based on damage mechanics theory, a mechanical model for rock blasting was established considering of the rock heterogeneity, in which rock blasting was considered as two consecutive stages: the dynamic stage caused by the stress wave and the static stage caused by explosion gas pressure. The cracks evolution of cutting seam cartridge blasting under different in-situ stress conditions was numerically simulated. The numerical results indicate that the blasting cracks mainly initiate around the cutting seam and propagate along the cutting seam direction. For different in-situ stress fields, the crack propagation will be suppressed when the maximum in-situ stress direction is perpendicular to the cutting seam direction, while promoted when the maximum in-situ stress direction is parallel to the cutting seam direction. The crack direction is controlled by the direction of cutting seam and maximum in-situ stress, while the crack propagation is suppressed by the in-situ stress field.
- mechanics of explosion /
- in-situ stress /
- blasting stress wave /
- explosion gas pressure /
- lateral coefficient /
- cutting seam cartridge blasting

HTML全文

图 1 不同均质度数值试样的弹性模量分布

Figure 1. Elastic modulus distribution of specimens with different homogeneity

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图 2 单轴应力状态下的本构关系

Figure 2. The constitutive law under uniaxial stress condition

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图 3 爆破损伤的计算模型

Figure 3. Numerical model for blasting damage

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图 4 爆炸应力波与爆生气体压力加载曲线

Figure 4. Load curve of blasting stress wave and explosion gas

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图 5(a) 无地应力时0°切缝角下爆破裂纹演化过程

Figure 5(a). Cracks evolution for cutting seam cartridge blasting without in-situ stress under cutting seam angle of 0°

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图 5(b) 无地应力时0°切缝角下爆破裂纹演化过程

Figure 5(b). Cracks evolution for cutting seam cartridge blasting without in-situ stress under cutting seam angle of 0°

下载: 全尺寸图片幻灯片

图 5(c) 无地应力时45°切缝角下爆破裂纹演化过程

Figure 5(c). Cracks evolution for cutting seam cartridge blasting without in-situ stress under cutting seam angle of 45°

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图 5(d) 无地应力时60°切缝角下爆破裂纹演化过程

Figure 5(d). Cracks evolution for cutting seam cartridge blasting without in-situ stress under cutting seam angle of 60°

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图 5(e) 无地应力时90°切缝角下爆破裂纹演化过程

Figure 5(e). Cracks evolution for cutting seam cartridge blasting without in-situ stress under cutting seam angle of 90°

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图 6(a) 侧压力系数为0.1时0°切缝角下切缝药包爆破裂纹演化过程

Figure 6(a). Cracks evolution for cutting seam cartridge blasting with lateral coefficient of 0.1 under cutting seam angle of 0°

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图 6(b) 侧压力系数为0.1时30°切缝角下切缝药包爆破裂纹演化过程

Figure 6(b). Cracks evolution for cutting seam cartridge blasting with lateral coefficient of 0.1 under cutting seam angle of 30°

下载: 全尺寸图片幻灯片

图 6(c) 侧压力系数为0.1时45°切缝角下切缝药包爆破裂纹演化过程

Figure 6(c). Cracks evolution for cutting seam cartridge blasting with lateral coefficient of 0.1 under cutting seam angle of 45°

下载: 全尺寸图片幻灯片

图 6(d) 侧压力系数为0.1时60°切缝角下切缝药包爆破裂纹演化过程

Figure 6(d). Cracks evolution for cutting seam cartridge blasting with lateral coefficient of 0.1 under cutting seam angle of 60°

下载: 全尺寸图片幻灯片

图 6(e) 侧压力系数为0.1时90°切缝角下切缝药包爆破裂纹演化过程

Figure 6(e). Cracks evolution for cutting seam cartridge blasting with lateral coefficient of 0.1 under cutting seam angle of 90°

下载: 全尺寸图片幻灯片

图 7 侧压力系数为1.0时切缝药包爆破裂纹最终分布

Figure 7. Crack distribution for cutting seam cartridge blasting with lateral coefficient of 1.0

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图 8 侧压力系数为5.0时切缝药包爆破裂纹最终分布

Figure 8. Cracks distribution for cutting seam cartridge blasting with lateral coefficient of 5.0

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