Band type wangeviry mining technology branch entry supporting method

Abstract

The invention discloses a band type wangeviry mining technology branch entry supporting method. The band type wangeviry mining technology branch entry supporting method comprises three steps for completing supporting work: preliminary supporting is performed during branch entry tunneling, screw-thread steel anchor rods and anchor ropes are arranged on top plates, and glass anchor rods are arranged on two sides; after the preliminary supporting is completed and first mining pit excavation is completed, anchor rods are hit on one side coal wall close to an unexcavated mining pit to improve the residual strength of a coal body and provide a certain supporting role on excavation activities of an adjacent mining pit; after the excavation close to the mining pit is also completed, an inter-tool coal pillar with the width of 2 m is reserved between the two mining pits, and double-pretightening-force anchor rods are hit on the coal pillar; then, the operation is cyclically performed with completion of excavation of the mining pits till the excavation works of all mining pits in a branch entry are completed. The band type wangeviry mining technology branch entry supporting method can improve the residual strength of the inter-tool coal pillar left after the excavation of the mining pits is completed, improves the residual strength of the inter-tool coal pillar and the stability of a branch entry roadway, decreases supporting pressures of adjacent unexcavated mining pits and facilitates earth's surface subsidence control and earth's surface building (construction) protection.

Description

technical field [0001] The invention relates to a support method for a branch lane of the strip-type Wangerville coal mining technology, which belongs to the technical field of coal mining. Background technique [0002] The strip-type Wangerwilli coal mining technology combines the long-wall arrangement of strip mining with the short-pillar Wangerwilli high-efficiency coal mining technology, and forms a new building (structure) through complementary advantages Under the coal mining technology. This technology can give full play to the respective advantages of strip mining and Wangerville coal mining method, and overcome the frequent moving of the strip mining face, low mining efficiency, poor ventilation conditions of Wangerville coal mining, and poor long-term stability of coal pillars To realize the efficient recovery of "three-down" compressed coal. Strip Wangerwilli coal mining technology is a new coal mining method. [0003] However, the layout of the roadway is very...

AI Technical Summary

Problems solved by technology

There are multiple mining tunnels arranged on both sides of the roadway, which also undertake the function of ventilation and transportation for multiple mining tunnels. After the mining of the mining tunnels at the end of the roadway is completed, there are only a few 2m-wide coal pillars between the knives on both sides of this part of the roadway. The weight of the overlying strata can be seen from theoretical calculations. The supporting coal pillars between the knives have been completely destroyed, and only the residual strength supports the overlying strata; Under the influence of the conventional support method, it is difficult to meet the stability requirements of the branch roadway, resulting in a sudden increase in the support pressure of the adjacent unexploited mining tunnels, causing great safety hazards for the next step of coal mining activities, and affecting the subsequent excavation of mining tunnels. Ventilation also caused certain difficulties

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