大采高多断层工作面综放诱发地表沉陷观测及数值分析

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Abstract In-situ observation has been carried out to investigate the surface subsidence law of high-intensity full-mechanized mining in Wangzhuang coal mine in recent years. Through the hole observation，the distribution laws of caving zone and fractured zone have been obtained based on these in-situ observation data；and the maximum subsidence value has also been monitored. Discontinuous deformation analysis(DDA) has been used to simulate the movement and failure of rock strata；and the surface subsidence model is established. Especially，effects of multiple faults on rock strata movement and surface subsidence have been considered in the numerical model. The maximum subsidence value is about 4.5 m based on DDA，which is less than in-situ measurement value of 4.9 m. The main reason is that the effects of four larger faults around the working face have been only considered in the numerical models. However，there are many small faults and other small geologic structures in the actual area. The actual geological conditions are far more complex than that considered in the proposed numerical model. Finally，the surface subsidence laws of working face with and without faults effects which have the similar geological conditions are compared. The laws of fracture and movement of the overlying rock strata with and without faults have been investigated，respectively；and the discrepancy between them has been discussed in detail.

Key words： mining engineering large mining height full-mechanized mining activity fault surface subsidence discontinuous deformation analysis(DDA)

Received: 14 February 2011

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http://www.rockmech.org/EN/Y2011/V30/I6/1216

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