Method for enlarging, filling and supporting coal-pillar-free mining roadway for fully-mechanized top coal caving

Abstract

The invention relates to a method for enlarging, filling and supporting a coal-pillar-free mining roadway for fully-mechanized top coal caving, which comprises the following steps of: A, evenly mixing gravel and sand on a ground mixing plant; B, transferring the obtained mixture of the gravel and the sand, cement, flyash and additive to a storing part of an underground pump station; C, loading the materials in the step B to a mixer to be mixed evenly to obtain filling concrete; D, pumping the concrete obtained in the step C to a filling module, and filling along with the enlarging to ensure filling quality; E, forming a filling wall with an early strength in the filling module by the concrete, and demoulding after the filling wall reaches the supporting strength of a top plate; F, cleaning a filling pipeline, and pumping clean water to moisten the pipeline and test the pressure; and G, repeating the steps A-F until the filling is completed.

Description

technical field [0001] The invention relates to a support method for fully mechanized top-coal caving without coal pillar mining, in particular to a method for fully mechanized top-coal caving without coal pillar mining roadway expansion side filling concrete wall support method. Background technique [0002] The popularization and application of coal pillar-free mining mode is an important part of exploring the realization of energy-saving and emission-reduction ideas and implementing the strategy of sustainable development of human survival in the current coal mine production and construction in my country. At the same time, coal pillar-free mining technology is an important research of "green mining". Branch is also one of the key research directions funded by the National Twelfth Five-Year Plan. The reserves of adjacent coal seams that cannot be exploited due to the concentrated stress of the coal pillars in the existing mines in the protection roadway in my country may b...

AI Technical Summary

Problems solved by technology

It solves the problems of waste of coal resources in the existing fully mechanized caving along the goaf, low coal recovery rate, complicated filling construction technology, and the inability to realize the integration of side expansion, filling and support to control the large deformation of surrounding rock, failure and instability, and at the same time eliminate Influenced by the concentrated stress of the coal pillar, the roadway maintenance cost is reduced, and the operation efficiency of the non-coal pillar mining mode is improved.

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