Comprehensive control method for surrounding rock of gob-side entry retaining in deep without side entry filling

Abstract

This application relates to the technical field of coal mining, and in particular to a comprehensive control method for surrounding rock of gob-side entry retaining in deep non-advance filling, which includes the following steps: during the roadway support process, the roof is supported by anchor cables with constant resistance and large deformation; The solid coal side adopts the joint support method of anchor rod and anchor cable, and then anchors the bearing layer of the anchor rod in the stable coal body through the anchor cable; The rod includes a drill bit, a pull rod, a second pallet and a drill joint arranged in sequence, and a plurality of resistance heads are arranged at intervals on the pull rod, and the resistance heads include a plurality of wedge-shaped steel plates welded circumferentially on the pull rod, so The width of the wedge-shaped steel plate gradually increases along the direction from the drill bit to the second pallet. The wedge-shaped steel plate and gangue rub against each other to generate anchoring force. With the gradual compaction of the goaf, the supporting force of the self-drilling multi-resistance anchor gradually increases, which can better maintain gangue roadside together with the gangue blocking device. .

Description

technical field [0001] The application relates to the technical field of coal mining, in particular to a comprehensive control method for surrounding rock of gob-side entry retaining in deep non-entryside filling. Background technique [0002] With the large-scale coal mining, shallow and central resources are decreasing and exhausted day by day, and many mining areas in our country have entered the state of deep mining one after another. The mining depth of my country's coal mines extends to the deep at a rate of 10-20m per year. At present, the mining depth of many mining areas is above 800m, and there are more than 40 mines with a mining depth of 1,000 meters or more. It is predicted that in order to meet the needs of my country's rapid economic development, the status quo of coal's dominant position in my country's primary energy structure will remain difficult to change for a long period of time, and more mines will enter the state of deep mining in the future. After e...

AI Technical Summary

Problems solved by technology

The technology of gobside entry retention without side filling has been relatively mature and achieved good results in shallow and central mines with simple geological conditions, but it is still unsatisfactory in deep mines with complex geological conditions. Affected by the deep complex geomechanical environment, the original rock stress, structural stress and mining stress increased significantly, the deformation impact and rheology of the deep rock mass were prominent, the range of the surrounding rock crushing zone and the plastic zone of the coal side was significantly expanded, and there was no roadside filling in the deep part The surrounding rock of gob-side entry retaining is prone to large deformation, which cannot meet the requirements of on-site use, resulting in the failure of entry retaining

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