Abstract
Through the analysis of the project of gob-side entry retaining in the deep gangue filling 2305S-2# working face of the Xinjulong coal mine, the principle and technology of surrounding rock control of gob-side entry retaining along the deep mining face are discussed. It is found that the use of gangue to fill the goaf of the deep mining face can effectively alleviate the occurrence of violent strata pressure, which is the basis for realizing entry retaining along the goaf. In the Xinjulong coal mine, the gangue wall and concrete-filled steel tube columns are used as roadside support structure. Anchor bolt + W steel belt are used as advance support, monomer column + hinged beam are used as temporary support, and long anchor cable + beam are used as permanent support. Gob-side entry retaining of deep mining working face is successfully realized. The actual measurement results show that the bearing capacity of gangue wall increases slowly, and the deformation is large. The concrete-filled steel tube column has a certain drilling bottom, and the roof cable is easily broken on the side of the remaining roadway. It is necessary to strengthen the lateral constraint of the gangue wall, limit the deformation of the gangue wall, and improve the bearing capacity of the gangue wall. The bottom of the concrete-filled steel tube column needs to be installed with a large backing plate to control the bottom drilling amount, and the roof anchor cable of the roadway must have a certain elongation to realize the coordinated deformation of the anchor cable and the roof.
Highlights
China is rich in coal resources as it is the world’s largest coal mining country; the loss rate of resources in the process of coal mining is high. e coal lost by coal pillar accounts for 30%∼40% [1, 2]. e coal pillar wastes a lot of valuable coal resources and causes stress concentration affecting the stability of the surrounding rock [3, 4]
Taking the 2305S-2# deep shaft working face in the Xinjulong coal mine of Shandong Province as an example, the principle and technology of gob-side retaining in deep mine waste filling face are discussed: (1) Using gangue to fill the goaf of deep mine working face, the working resistance of the hydraulic support of the working face is within the range of rated working resistance, and there is no large stress fluctuation, which can effectively alleviate the severe ground pressure behavior of the deep mine working face, and provide the basis for gob-side entry retaining in the deep mine working face n
Gangue wall and concrete-filled steel tube column are used as roadside support structure
Summary
China is rich in coal resources as it is the world’s largest coal mining country; the loss rate of resources in the process of coal mining is high. e coal lost by coal pillar accounts for 30%∼40% [1, 2]. e coal pillar wastes a lot of valuable coal resources and causes stress concentration affecting the stability of the surrounding rock [3, 4]. Since the 1970s, China has applied the technology of retaining roadway along the goaf and has made remarkable progress in the form, structure, and material of supporting, which has been successfully popularized and applied in the thin and medium thick coal seam mines with shallow buried depth [8,9,10]. When the mining depth is less than 500 m, the length of the “cantilever beam” and support strength are the main factors affecting the stability of surrounding rock in gob-side entry retaining. The ground pressure behavior law of gob-side entry retaining in deep mine, the process of roof rock movement of gob-side entry retaining, the stress distribution characteristics of filling wall, and the control design of support resistance of roadway side filling body are discussed. The mining depth of the Xinjulong coal mine of Shandong Xinwen Mining Group has exceeded 900 m, and the coal body and roof belong to weak impact tendency coal rock mass. e research has successfully realized the gob-side entry retaining of 2305S-2# working face under the condition of weak impact in deep mine, which provides valuable experience for deep coal mining
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