采场覆岩变形的分布式光纤检测试验研究

doi:10.13722/j.cnki.jrme.2016.0892

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摘要为了解决采场模型试验中岩体内部变形状态难以测试、岩层运动过程难以描述的问题，利用BOTDA分布式光纤传感技术研究了岩层变形及垮落过程的分布式光纤检测与表征。在实验室建立3 000 mm×200 mm×1 280 mm(长×宽×高)的采场覆岩模型，将3条水平传感光纤和3条垂直传感光纤预埋于模型内部，利用光纤测试模型开挖过程中的覆岩变形状态，并将其与光纤Bragg光栅、百分表和全站仪的测试结果进行对比。试验表明，岩层垮落移动与分布式光纤测试结果呈明显的对应关系，应变曲线揭示了各回采阶段时的上覆岩层变形状态，分别表征了岩层破断线发育状态、垮落角变化大小、岩层内部应力演化及岩层垮落从下向上的发展过程；测试结果对比显示该方法在模型试验中具有较好的适用性，能精确反映上覆岩层的变形特征。

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	柴敬1
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	刘奇1

关键词 ：采矿工程, 覆岩变形, 布里渊光时域分析, 模型试验, 测试方法

Abstract：In order to solve the difficulties of internal deformation measurement and movement characteristics describing in the overlying strata model test，a detecting method based on BOTDA distributed optical fiber sensing was put forward to study the optical fiber sensing representation of rock layers fracture and collapse. A similar material model with the size of 3 000 mm(L)×200 mm(W)×1 280 mm(H) was produced to simulate the caving process of overlying rock strata，three horizontal optical fibers and three vertical optical fibers were pre-embedded while the model production. Afterwards，the model test of strata movement by distributed optical fiber sensing was carried out and the results comparison were conducted by comparing the measurement results between the BOTDA and the optical fiber Bragg grating sensors，dial indicators and total station. The results show that the strata collapse has aroused a clear strain variation，its distribution reveals the caving status of overlying strata under different extracting stages，which represents the development of strata fractured lines，the change of caving angles，the evolution of rock internal stress and the process of strata caving from bottom to top of the model. It indicates that the BOTDA distributed optical fiber detection method has a good adaptability in this experiment，which can sense and reflect the rock deformation characteristics，and a standardization optical fiber installation procedure will help to further improve the testing reliability and quantification.

Key words： mining engineering overlying strata deformation Brillouin optical time domain analysis(BOTDA) model test measurement

引用本文:

柴敬1，2，袁强1，李毅1，2，张丁丁1，2，刘奇1. 采场覆岩变形的分布式光纤检测试验研究[J]. 岩石力学与工程学报, 2016, 35(S2): 3589-3596.
CHAI Jing1，2，YUAN Qiang1，LI Yi1，2，ZHANG Dingding1，2，LIU Qi1. Experimental study on overlying strata deformation based on distributed optical fiber sensing. , 2016, 35(S2): 3589-3596.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0892 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS2/3589

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