不同加载模式下煤岩破坏特性试验研究 |
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引用本文: | 任建喜,王晓琳,张琨,张卫军. 不同加载模式下煤岩破坏特性试验研究[J]. 煤炭工程, 2020, 52(10): 125-129. DOI: 10.11799/ce202010025 |
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作者姓名: | 任建喜 王晓琳 张琨 张卫军 |
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作者单位: | 1. 西安科技大学建筑与土木工程学院;2. 西安科技大学; |
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摘 要: | 利用煤岩力学伺服三轴压缩试验系统,辅以声发射监测手段,对彬长矿区胡家河矿煤岩进行不同加载模式的试验,对比煤岩在单轴、常规三轴及动静载组合试验条件下的宏观力学表现与损伤特征探究诱发冲击地压的机制问题。结果表明:在常规三轴条件下,随着围压的增大,煤岩强度逐渐提高,煤岩内部的储能能力逐渐增大|施加动载后,随着动载频率的增加,煤岩强度劣化越明显,煤岩经动载扰动后由塑性变形转变为脆性破坏|动载损伤较静载损伤更加剧烈、迅速,使得煤岩在破坏形式存在明显差异。单轴压缩条件下煤岩破坏为劈裂破坏,存有围压破坏时为剪切破坏,而在施加动载后煤岩纵横裂缝交错,为压剪组合破坏形式。
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关 键 词: | 煤岩 冲击地压 动静载荷 损伤演化 试验研究 |
收稿时间: | 2019-12-24 |
修稿时间: | 2020-03-02 |
Failure characteristics and experimental study of coal rock under different loading modes |
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Abstract: | Based on the servo triaxial compression test system of coal and rock mechanics and acoustic emission monitoring method, the different loading mode tests of coal and rock in hujiahe mining area are carried out, and the macroscopic mechanical performance and damage characteristics of coal and rock under uniaxial, conventional triaxial and dynamic static load combination tests are compared to explore the mechanism of induced rockburst. The results show that under the conventional triaxial condition, with the increase of confining pressure, the strength of coal rock increases gradually, and the energy storage capacity of coal rock increases gradually; with the increase of dynamic load frequency, the strength degradation of coal rock becomes more obvious, and the coal rock changes from plastic deformation to brittle failure after the dynamic load disturbance; the dynamic load damage is more severe and rapid than the static load damage, which makes the coal rock in failure There are obvious differences in forms. The whole coal rock is broken into several coal blocks with different particle sizes, and some areas are ground into powder. |
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