煤试样激波冲击损伤破坏特征实验研究

解北京; 丁浩; 陈冬新; 杨宇

煤试样激波冲击损伤破坏特征实验研究

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出版历程
- 发布日期: 2021-05-19

Experimental study on damage characteristics of coal sample by shock wave impact

摘要

摘要: 在设计改造实验室台式激波管的基础上，搭建激波动压冲击作用下煤样损伤破坏测试实验系统，开展不同驱动气体条件下激波阶跃压力特性和不同压力、有无层理结构、不同层理结构煤样的冲击损伤破坏特征研究。结果表明：CO₂与空气在相同气压下煤样内部损伤效果明显且破坏程度相近；在不同激波入射压力下，无层理结构的型煤损伤破坏程度随着入射压力的增大而增大；相比无层理结构型煤煤样受冲击后强度及煤样内部致密结构受破坏程度变化剧烈，任意层理结构原煤煤样破坏程度变化较小；垂直层理与平行层理原煤煤样，在中高速射压力冲击呈现良好的一致性，在低速时平行层理承受抗压能力较垂直层理弱。
- 激波管 /
- 超测试 /
- 层理构造 /
- 损伤破坏 /
- 致裂增透
Abstract: On the basis of designing and transforming the bench shock tube in the laboratory, a test system for coal sample damage and destruction under shock pressure was built, and shock step pressure characteristics under different driving gas conditions and different pressures, with or without bedding structure and different bedding structures were studied. The results show that: CO₂ and air have obvious internal damage effect and similar damage degree at the same pressure; under different shock wave incident pressures, the damage degree of briquette without bedding structure increases with the increase of incident pressure; compared with the impact strength of briquette coal samples without bedding structure and the serious degree of destruction of the dense structure inside the coal samples, the degree of damage of the coal samples of any bedding structure changes little; the vertical bedding and parallel bedding raw coal samples show good consistency at medium and high-speed jet pressure impacts. At low speeds, parallel bedding is less resistant to compression than vertical bedding.
- shock tube /
- ultrasonic testing /
- bedding structure /
- damage and destruction /
- fracturing and permeability improvement

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参考文献(20)

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