完全充填开采下地表变形特征分析及现状评价

doi:10.13722/j.cnki.jrme.2018.0396

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Abstract Backfill mining is often considered as one of the effective methods to control the movement of overlying strata and to protect the ground surface in underground metal mining. In order to analyse and evaluate deformation characteristics and current situation of overlying surface after 8 years of multi-level completely backfill mining in the west of exploration line 10 of Taohuazui gold mine，an AHP-Fuzzy evaluation model of stope safety was established and the safety analysis mode of“stopes to overlying strata and surface”was put forward. The whole backfill mining process according to the historical sequence of past 8 years was simulated，and the numerical results were compared with the monitored data of surface subsidence in the past 2 years. The results show that 22 of the totally 25 backfill stopes are in good safety condition and belong to level II. The existing condition of orebody，the mining method and the distance from the shafts of 11 evaluated factors are the most significant in influencing the stopes and current regional safety. The strata can be divided into“relative significantly disturbed area”and“micro disturbed area”. The relative significantly disturbed area tends to form a certain height of“Natural rock movement arch”with the morphology of approximately a 3D ellipsoid. The effects of ellipsoid on overlying surface are weak when the backfill mining reaches a certain depth. The micro disturbed area tends to form a“Micro subsidence basin”. The surface of mining area gradually changed from undisturbed status to 0.5–1 mm micro-disturbed status in 2014. The time effect of backfill on surface safety is weak. All the observation points of three closed loops arranged on the surface are in stable fluctuation，which fluctuate along the horizontal lines of 0，－3 and －6 mm respectively. The surface settlement did not exceed the allowed deformation value during the observation period. The calculated results agreed largely with the monitored data. The overall safety of surface is good.

Key words： mining engineering underground metal mine completely backfill surface subsidence observation surface deformation characteristics current situation evaluation

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	Articles by authors
	JIANG Feifei1
	2
	ZHOU Hui1
	2
	SHENG Jia3
	4
	SHUAI Jinshan5
	SUN Desheng5
	HU Yong5
	LI Xiangdong3

Cite this article:

JIANG Feifei1,2,ZHOU Hui1, et al. Analysis and evaluation of surface deformation characteristics under the condition of completely backfill mining[J]. , 2018, 37(10): 2344-2358.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0396 OR http://www.rockmech.org/EN/Y2018/V37/I10/2344

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