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动静荷载下巷道围岩稳定性测试系统研制与应用

Development and application of stability testing system for roadway surrounding rock under dynamic and static load

  • 摘要: 针对动静荷载下巷道围岩易发生大变形、冒顶等动力灾害问题,自主研发了一套动静荷载下巷道围岩稳定性测试试验系统,为揭示巷道围岩动力响应规律和破坏特征提供了新方法。系统由框架结构、静载加载系统、动载施加结构和多源监测系统组成,可实现水平和垂直方向、不同应力波扰动强度下的围岩稳定性测试试验。结果表明:静载加载系统可实现轴向和侧向荷载同步加载,模拟围岩应力环境;动载施加结构采用落锤冲击悬挂装置与应力波发生盒组合加载,冲击后上下盒体发生相对滑移,从而产生水平和垂直方向的面波。通过改变冲击锤质量和冲击高度,可以模拟不同峰值的水平和垂直加速度,结合加速度传感器实现了加速度的定量表征。多源监测系统由加速度传感器、压力传感器、声发射传感器、高速相机和XTDIC数字散斑组成,实现了围岩应力、位移、加速度、声发射(Acoustic Emission, AE)能量及破坏特征的宏观-微观同步监测。Spearman相关性分析结果表明,多源监测数据具有较强相关性。利用连续-非连续耦合的数值模拟方法复现了物理相似试验围岩破坏过程,数值模拟得到的围岩破坏特征与物理相似试验结果一致,验证了试验的准确性和设备的可靠性。研究成果表明,该试验系统可以为动静荷载下巷道围岩稳定性测试提供试验支撑。

     

    Abstract: The surrounding rock of deep roadways in coal mines is prone to large deformation, roof collapse, and other dynamic disasters under the combined action of static and dynamic loads. An experimental system for testing roadway surrounding rock stability under combined static and dynamic loading has been developed, providing a new approach for revealing the dynamic response patterns and failure characteristics of surrounding rock. The system consists of a loading frame, a static loading module, a dynamic disturbance unit, and a multi-source monitoring system, enabling stability tests of roadway surrounding rock under bidirectional horizontal and vertical impact disturbances with varying stress wave intensities. The results indicate that the static loading system enables simultaneous application of axial and lateral loads, thereby simulating the in-situ stress environment of surrounding rock. The dynamic loading unit combines a drop-hammer impact device with a stress wave generator for disturbance application. Upon hammer impact, the upper and lower halves of the stress wave generator slide relative to each other, inducing surface waves in both horizontal and vertical directions. By adjusting the hammer mass and drop height, impact disturbances with different peak horizontal and vertical accelerations can be generated, which were quantitatively characterized using accelerometers. Together with earth pressure cells, acoustic emission (AE) sensors, a high-speed camera, and the XTDIC digital image correlation system, a multi-source monitoring system was established, enabling synchronous macro–micro monitoring of stress, displacement, acceleration, AE energy, and fracture evolution of the surrounding rock. The correlation of the multi-source monitoring data was further validated through Spearman’s correlation analysis. Furthermore, a continuous–discontinuous coupled numerical method was applied to reproduce the physical model test process. The simulation results were consistent with the experimental observations, confirming the accuracy of the tests and the reliability of the developed system. Overall, this study establishes an effective laboratory platform for investigating roadway stability under coupled static–dynamic loads, thereby providing experimental support for understanding dynamic disaster mechanisms and guiding roadway support design in deep coal mines.

     

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