In order to study the regularity of overburden deformation and mining pressure changes in the stope. Take the geological conditions of Hanglaiwan coal mine in Yushen mining area as the background, a physical similar material model was established in laboratory. Eight fiber Bragg grating sensors were embedded in the model, used to monitor the movement and deformation of the overburden key stratum and the change of mining abutment pressure in real time and then to determine the influencing factors and strain transfer coefficients of the fiber grating through theoretical analysis and calibration experiments. The results show the following. (1) The changes in value, position, and shape of the strain can reflect the dynamic evolution process of bending deformation, breaking, and rotation of the key strata. When the key layer breaks for the first time, the strain curve shows a peak shape; when the key layer breaks periodically, the strain curve of the fiber grating sensor showed a plateau shape for a period of time. (2) The strain curve has a good corresponding relationship with the change in supporting pressure. When the strain curve of the fiber Bragg grating sensor was at the trough stage, the abutment pressure was at the peak stage, with the increase of sensor buried height, and the supporting pressure and the strain value had a linear relationship within the range of the advanced abutment pressure. The conclusion shows that the fiber Bragg grating sensor monitoring technology has good effect on the internal strain and key supporting pressure monitoring of the overburden in the model test; it provides new monitoring methods and means for the model tests.

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光纤布拉格光栅传感技术的开采效应下覆盖层变形演化的试验研究

为了研究采场上覆岩变形和采动压力变化的规律性。以榆神矿区杭来湾煤矿的地质条件为背景，在实验室建立了物理相似的材料模型。模型中嵌入了八个光纤布拉格光栅传感器，用于实时监测覆盖层关键层的运动和变形以及采矿基台压力的变化，然后通过理论确定光纤光栅的影响因素和应变传递系数。分析和校准实验。结果显示如下。（1）应变值，位置和形状的变化可以反映关键层弯曲变形，断裂和旋转的动态演化过程。当关键层首次断裂时，应变曲线显示出峰形；当关键层周期性地断裂时，光纤光栅传感器的应变曲线在一段时间内呈现出平台形状。（2）应变曲线与支撑压力的变化具有良好的对应关系。当光纤布拉格光栅传感器的应变曲线处于谷值阶段时，基台压力处于峰值阶段，随着传感器埋入高度的增加，支撑压力与应变值在应变范围内呈线性关系。先进的基台压力。结论表明，在模型试验中，光纤布拉格光栅传感器监测技术对覆盖层的内部应变和关键支撑压力监测具有良好的效果。它为模型测试提供了新的监视方法和手段。随着传感器埋深的增加，支撑压力与应变值在超前基台压力范围内呈线性关系。结论表明，在模型试验中，光纤布拉格光栅传感器监测技术对覆盖层的内部应变和关键支撑压力监测具有良好的效果。它为模型测试提供了新的监视方法和手段。随着传感器埋深的增加，支撑压力与应变值在超前基台压力范围内呈线性关系。结论表明，在模型试验中，光纤布拉格光栅传感器监测技术对覆盖层的内部应变和关键支撑压力监测具有良好的效果。它为模型测试提供了新的监视方法和手段。