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In order to solve the problem of wasting and poor stability of coal pillar in gob-side entry driving, this paper put forward the concrete carrier replacing chain pillar to achieve the true pillar less mining. The concrete carrier replacing chain pillar is to set aside along concrete carrier driving roadway rather than along the chain pillar. The gangue in the underground mining is directly crushed to produce prefabricated block, then the prefabricated block is connected with the top of roadway to form a concrete carrier which can support the top plate and isolate the goaf and the next section ventilation roadway. The key block theory, FLAC3D numerical simulation and engineering application were used to analyze the stability, feasibility and economy of concrete carrier replacing chain pillar. The results revealed that: The deformation of roadway of concrete carrier is far less than that of coal pillar; The concrete carrier of 1200 meter can gain revenue of 8.325 million Yuan. So it has a significant economic benefit.

Study on Concrete Carrier Replacing Chain Pillar Between Two Working-faces of the Mining