OFDR光纤传感技术在十字岩柱暗挖法物理模型试验中的应用

doi:DOI：10.13722/j.cnki.jrme.2016.0956

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Abstract The point-type sensors are widely used for monitoring the surrounding rock deformation in geo-mechanical modelling tests，but they can only obtain the strains at a few measuring points. Fibre optic sensing，as one rapidly developing distributed monitoring technology，can resolve this problem，but it cannot yet meet the requirement of high spatial resolution. This paper introduces one new OFDR(optical frequency domain reflectometry)-based sensing technology，and applies it in the geo-mechanical test modelling the excavation of shallow buried large diameter circular tunnel using the cross rock pillar method to achieve the continuous monitoring on the horizontal strains in different tunnel cross sections during excavation. Combined with the FEM analysis，the results show that the OFDR based sensing technology can accurately record the change of strain inside the geo-mechanical model during testing. It can reveal the deformation tendency of the surrounding rock when excavated using the cross rock pillar method，reflect the supporting effect of the cross rock pillar to the surround rock，and then guide the future tunnel excavation activities. The results are compared with the monitoring results obtained from the multipoint displacement meter after converting the strain-type results into the displacement-type results，and their deviations are within 10%. Generally，the OFDR-based sensing technology can be applied to the deformation monitoring in geo-mechanical modelling tests.

Key words： tunnelling engineering cross rock pillar model test fiber optic sensor strain distribution optical frequency domain reflectometry(OFDR) distributed monitoring

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	Articles by authors
	LIU Quansheng1
	2
	WANG Juntao1
	XIAO Longge3
	LI Jichao3
	LIU Bin1
	ZHANG Xiaolei4

Cite this article:

LIU Quansheng1,2,WANG Juntao1, et al. Application of OFDR-based sensing technology in geo-mechanical model test on tunnel excavation using cross rock pillar method[J]. , 2017, 36(5): 1063-1075.

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http://www.rockmech.org/EN/DOI：10.13722/j.cnki.jrme.2016.0956 OR http://www.rockmech.org/EN/Y2017/V36/I5/1063

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