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Analysis of test method for physical model test of mining based on optical fiber sensing technology detection

机译：基于光纤传感技术检测的采矿物理模型测试测试方法分析

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摘要

The common utilization research methods in mining engineering include theoretical analysis, mechanical modeling, similarity model test, numerical simulation, and field test. And physical similarity model test is one of the main research methods for mining engineering problems. Underground engineering is often in the complex three-dimensional stress state. Compared with plane model, three-dimensional model can actually reflect the stress state of surrounding rock. Nevertheless, traditional measurement methods can't achieve internal deformation of the model with multi-scale distributed monitoring. Optical fiber sensing technology provides a solution to these problems. The sensing fibers are arranged in the plane model with the size of 3000 x 200 x 1280 mm and the three-dimensional model with the size of 3600 x 2000 x 2000 mm, and the strain distribution of the model has been analyzed with the consideration of different positions relationship between the working face and the optic fiber. The results show: the strain coefficient of the test optic fiber with 2 mm diameter calibrated by the uniform strength beam experiment is 0.0497 MHz/mu epsilon. The frequency shift of the optic fiber is positive when the fiber is under tension state, and the result is opposite when under compression; In physical model tests, when the working face is close to the sensing fiber, the strain curve shows a negative step change caused by the abutment pressure. When the working face cross the fiber, the strain curve shows a positive step change due to the downward movement of broken rock layer; after the working face away from the fiber, the re-compaction of the broken rock block induced by gravity load causes the optical fiber to be under pressure, and the sensing fiber generates compressive strain. The three-segment distribution area of the strain curve corresponds to the "three-zone" height range of the overburden caused by mining, respectively. The test results could provide theoretical guidance for the application of distributed optical fiber in the determination of the caving zone and fractured zone range of overburden induced by coal mining.
机译：采矿工程中常用的研究方法包括理论分析，力学建模，相似模型测试，数值模拟和现场测试。物理相似性模型测试是采矿工程问题的主要研究方法之一。地下工程通常处于复杂的三维应力状态。与平面模型相比，三维模型实际上可以反映围岩的应力状态。但是，传统的测量方法无法通过多尺度分布式监视来实现模型的内部变形。光纤传感技术为这些问题提供了解决方案。传感纤维排列在尺寸为3000 x 200 x 1280 mm的平面模型和尺寸为3600 x 2000 x 2000 mm的三维模型中，并且考虑了以下因素对模型的应变分布进行了分析：工作面和光纤之间的不同位置关系。结果表明：通过均一强度束实验校准的直径为2 mm的测试光纤的应变系数为0.0497 MHz /με。当光纤处于拉伸状态时，光纤的频移为正，而在压缩状态下，结果相反。在物理模型测试中，当工作面靠近传感光纤时，应变曲线显示出由基台压力引起的负阶跃变化。当工作面穿过纤维时，应变曲线由于破碎的岩石层的向下运动而显示出正阶跃变化；工作面离开光纤后，由重力载荷引起的碎石块的重新压实使光纤处于压力下，传感光纤产生压缩应变。应变曲线的三段分布区域分别对应于采矿引起的覆盖层的“三区”高度范围。试验结果可为分布式光纤在确定煤矿开采覆岩的崩落带和断裂带范围中的应用提供理论指导。

著录项

  • 来源
    《Optical fiber technology》 |2019年第3期|84-94|共11页
  • 作者

    Chai Jing; Du Wengang; Yuan Qiang; Zhang Dingding;

  • 作者单位

    Xian Univ Sci & Technol, Coll Energy Engn, Xian 710054, Shaanxi, Peoples R China|Xian Univ Sci & Technol, Minist Educ Western Min & Mine Disaster Prevent &, Key Lab, Xian 710054, Shaanxi, Peoples R China;

    Xian Univ Sci & Technol, Coll Energy Engn, Xian 710054, Shaanxi, Peoples R China;

    Xian Univ Sci & Technol, Coll Energy Engn, Xian 710054, Shaanxi, Peoples R China;

    Xian Univ Sci & Technol, Coll Energy Engn, Xian 710054, Shaanxi, Peoples R China|Xian Univ Sci & Technol, Minist Educ Western Min & Mine Disaster Prevent &, Key Lab, Xian 710054, Shaanxi, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Mining engineering; Optical fiber sensing; Deformation detection;

    机译：采矿工程;光纤感测;变形检测;

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