【摘 要】
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The physical model experiment is an effective method to study the deformation and failure law of overburden strata in coal mine.The use of BOTDA distributed optical fiber sensing technology to monitor
【机 构】
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School of Energy Science and Engineering,Xi'an University of Science and Technology,Xi'an 710054,C
【出 处】
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第六届地质(岩土)工程光电传感监测国际论坛
论文部分内容阅读
The physical model experiment is an effective method to study the deformation and failure law of overburden strata in coal mine.The use of BOTDA distributed optical fiber sensing technology to monitor the internal stress,strain,displacement and other parameters of overlying strata deformation has important engineering application value.In the three-dimensional model test of 3000mm × 2000mm × 2000mm,a distributed optical fiber was laid at 760mm above the level of the working face of the model.The data of the NBX-6055 stress analyzer were collected when the working surface was excavated.Working face excavates 60 times and advances 2400 mm altogether.Finally,120 sets of experimental data of BOTDA distributed optical fiber were obtained,and the relationship was analysedbetween the Brillouin frequency shift and the fracture of the overlying strata.The results show that affected areas by mining is 40cm to 62cm in the front of the working face,and the cavingangle of the working face 1 and 2are about 58 ° and 54 ° respectively.The working face 1 and 2 occur first weighting when advanced to 64cm and 44cmrespectivelyand periodic weighting length is 12cm.The sensitivity of the optical fiber sensing test method is higher than the displacement tube,and the distributed optical fiber sensing technology has its unique advantages,which provides a new method and means for monitoring the strain and displacement in the complex environment of geotechnical engineering.
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