立井井壁变形光纤光栅远程实时监测预警系统
Remote real-time monitoring and early warning system for shaft wall deformation by fiber bragg grating
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摘要: 针对高寒矿区表土层冻融作用和含水层水压力引起的井壁变形问题，基于光纤光栅传感原理，沿井壁环向和竖向安装了10层光纤光栅应变和温度传感器，提出了井壁结构损伤识别方法，确定了混凝土结构变形破坏阈值，建立了立井井壁变形远程实时监测系统。经1年的高寒矿区灵东煤矿副井井壁监测结果表明：井壁变形光纤光栅监测系统能够实时监测预警、高寒地区长期稳定性好，井壁最大环向应变和轴向应变均低于混凝土屈服强度阈值，说明井壁目前处于稳定阶段。Abstract: Aiming at the deformation and fracture of shaft wall caused by freezing and thawing of topsoil and water pressure of aquifer in severe cold mining area, fiber bragg grating strain sensors are installed along the circumferential and longitudinal direction of shaft wall, the damage identification method of shaft wall structure is proposed, the real-time monitoring system of shaft wall deformation is established, and the deformation and failure threshold of concrete structure is determined through the compression test of concrete samples, and the real-time monitoring and early warning of shaft lining structure are realized. The monitoring results of the auxiliary shaft wall of Lingdong Coal Mine in severe cold mining area for nearly a year show that the shaft wall fiber bragg grating monitoring system can monitor in real time, has good stability, good coupling with concrete materials, and is easy to form a sensor monitoring network. The maximum circumferential strain and axial strain of shaft wall are both lower than the yield strength threshold of concrete, indicating that the shaft wall is in a stable stage at present.
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