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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试验试验方法分析

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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：采矿工程中的常用利用研究方法包括理论分析，机械建模，相似性模型试验，数值模拟和现场测试。和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。地下工程往往是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周围岩石的应力状态。尽管如此，传统的测量方法无法通过多尺度分布式监测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。传感纤维布置在平面模型中，尺寸为3000×200 x 1280 mm和三维模型的尺寸为3600 x 2000 x 2000 mm，并考虑了模型的应变分布。工作面和光纤之间的不同位置关系。结果表明：由均匀强度光束实验校准的测试光纤的应变系数为0.0497MHz / mm epsilon。当光纤处于张力状态下，光纤的频率偏移是正的，结果在压缩下相反;在物理模型测试中，当工作面靠近感测光纤时，应变曲线显示由邻接压力引起的负步骤变化。当工作面十字纤维时，应变曲线显示由于破碎岩层的向下移动而产生的正面变化;在从纤维外工作面后，由重力负荷引起的破碎岩石块的重新压实使光纤在压力下，并且传感光纤产生压缩菌株。应变曲线的三段分布区域分别对应于由采矿引起的覆盖层的“三区”高度范围。测试结果可以为分布式光纤应用提供理论指导，以确定煤开采诱导的碾压区域的塌陷区和裂缝区范围。

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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