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在传统矿山压力理论的基础上,用光纤Bragg光栅(FBG)传感器研究长壁工作面上覆岩层变形的“横三区”结构特征.在3 000mm×1 150mm×200mm的平面应力模型上模拟上覆岩层变形和运动,在模型中埋入9个光纤Bragg光栅传感器,几何相似比为1∶200.结果表明:FBG检测曲线反映出了采动覆岩变形和运动过程,曲线出现“三台阶”变化,其分别对应了覆岩破断前的离层发展、岩层破断与回转运动过程;建立了工作面裂隙带岩层“横三区”的光纤传感表征,其存在稳定区、扰动区、峰值区和恢复区.试验实现了上覆岩层运动及采动“横三区”的光纤光栅传感实时检测.
On the basis of the traditional mine pressure theory, the fiber Bragg grating (FBG) sensor is used to study the structural features of “horizontal three zones” of overburden deformation of longwall faces.On the plane stress model of 3 000 mm × 1 150 mm × 200 mm The deformation and the movement of overlying strata are simulated, and nine fiber Bragg grating sensors are buried in the model with the geometric similarity of 1: 200. The results show that the curve of FBG detection reflects the deformation and movement of overlying strata, Three steps “change, which correspond to the stratified development of stratified rock before breaking, the process of rock breaking and turning motion, respectively. The optical fiber sensing characterization of strata of rock face with” , Disturbance zone, peak zone and recovery zone.The experiment realizes the real-time detection of overlying strata motion and mining “FBR” FBG sensing.