基于BOTDA技术感测的大倾角煤层顶板活动规律研究

doi:10.13722/j.cnki.jrme.2018.1464

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Abstract Taking the steeply inclined seam mining as the research background and using the methods of engineering practice summary，theoretical analysis，mechanical modeling and physical similar model test，the failure law of the roof in steeply inclined seam mining was analyzed adopting BOTDA(distributed optical fiber sensing based on Brillouin scattering principle) and DIC(three-dimensional optical digital speckle) technologies. The research results show that the initial stress in the steeply inclined seam obeys a distribution of the largest in the middle part，the second in the lower part and the smallest in the upper part，that the bending moment and shear force in the middle-upper part are larger than those in the lower part，that the density of gangue accumulation gradually decreases from the bottom to the top，and that the activity of the upper and middle roof is intense while the lower part is relatively stable. Once the strain detected by optical fiber which can sense the internal weak deformation of rock mass，develops from monotonous increasing to decreasing，the roof will collapse，and at this moment，the instantaneous strain reaches the maximum. Both BOTDA and DIC techniques can detect the development and closure process of the roof abscission layer. The former shows a step change of the strain value and the later presents a strain mutation zone formed at the abscission layer. The monitoring results of the displacement at the same position by both total station and DIC reveal that the internal strain of the upper and middle basic roof is much larger than that of the lower part，which shows that the overburden deformation in steeply inclined seam mining is asymmetric. The research results in this paper can be used for reference in monitoring deformation and failure of geotechnical structures by using optical fiber sensing and DIC techniques.

Key words： mining engineering steeply dipping seam model test optical fiber sensing three-dimensional optical digital speckle

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	CHAI Jing1
	2
	DU Wengang1
	ZHANG Dingding1
	2
	LEI Wulin1

Cite this article:

CHAI Jing1,2,DU Wengang1, et al. Study on roof activity law in steeply inclined seams based on BOTDA sensing technology[J]. , 2019, 38(9): 1809-1818.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.1464 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I9/1809

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