深部煤岩冲击地压多功能物理模拟试验系统研制与应用

Multifunctional physical simulation test system for deep coal rockburst development and its application

  • 摘要: 为了深入研究深部地层煤岩体冲击地压及岩爆灾害致灾规律,自主研制了深部煤岩冲击地压多功能物理模拟试验系统。该系统主要由真三轴荷载加载系统、剪切加载扰动系统、油源与增压器系统、试件制作与输运系统、试验控制与数据采集系统构成。基于该系统开展了300 mm×300 mm×600 mm的粉砂岩及相似材料试验研究。试验结果表明:测试及功能试验证明系统具有良好的准确性和稳定性,能够较高质量的完成真三轴荷载试验,位移及力传感器测试精度良好,同时该系统能完成临空面冲击破坏试验和剪切扰动试验,破坏效果直观显著;巷道破坏现象与红外热成像云图呈现了较为一致的规律,破碎区域能量释放,温度云图颜色加深。整个应力加载阶段整体平均红外辐射温度逐渐增加,进入扰动加载期温度急剧增加;在临近全面破坏时巷道内部裂纹贯通,大量围岩从巷道壁面抛出,声发射计数和能量突增,并且保持在较高水平,声发射累计能量呈指数型增长。电磁辐射能量主要发生在扰动加载阶段的破裂期与全面破坏期,在全面破坏期呈现了明显的能量幅值急剧增加的现象,与声发射能量增幅较为相似,证明了冲击失稳破坏能量的剧烈释放。

     

    Abstract: In order to conduct an in-depth research on the disaster causing laws of coal-rock burst and rock burst in deep strata, a multi-functional physical simulation test system for rock burst in deep strata has been independently developed. The system mainly consists of a true triaxial load loading system, a shear loading disturbance system, an oil source and booster system, a specimen production and transportation system, and a test control and data acquisition system. Based on the system developed, an experimental research was conducted on 300 mm × 300 mm × 600 mm sandstone and similar materials. The test results show that the testing experiment proves that the system has good accuracy and stability, and the displacement and force sensor testing accuracy is high, which can complete the true triaxial load test with high quality. The system can complete the impact failure test on the free surface, and the failure effect is intuitive and significant. The phenomenon of roadway damage shows a consistent pattern with the infrared thermal imaging cloud map, and the color of the energy release temperature cloud map in the fractured area is deepened. The overall average infrared radiation temperature gradually increases during the entire stress loading stage, and the temperature increases sharply during the disturbance loading period. When the roadway approaches a complete destruction, the cracks inside the roadway penetrate, causing a large amount of surrounding rock to be thrown out from roadway walls and a sudden increase in acoustic emission counts and energy, while maintaining a high level of energy. The cumulative energy of acoustic emissions increases exponentially. The electromagnetic radiation energy mainly occurs during the rupture period and the comprehensive failure period of the disturbance loading stage. During the comprehensive failure period, there is a significant sharp increase in energy amplitude, which is like acoustic emission energy, verifying the degree of energy release from unstable failure.

     

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