April 25, according to the China Coal Institute news, coal mine buildings under pressure coal mining settlement problems to achieve a major breakthrough, the application of relevant technology has achieved good results.
In recent years, with China's various types of 10 million tons of mines continue to build and put into production, the mine's mining speed is geometrically increasing, coal mining in the mining process caused by highway roadbed subsidence, road damage, building cracks, housing collapse, groundwater level downward shift and other safety hazards and accidents occur from time to time. How to scientifically, safely and effectively solve a series of safety hazards such as surface collapse caused by coal mining under buildings has become a problem that needs to be solved by China's major coal mining enterprises and local governments.
China Coal Technology & Industry Group (CTIG) actively practices the development concept of “green mountains are golden mountains”, focuses on the mission of “leading mine ecological science and technology, and promoting green and low-carbon development”, insists on the combination of theoretical research and engineering practice, and gives full play to the advantages of its own scientific research. The company has explored a new type of overburden slurry filling technology for the release of overburden resources, surface collapse prevention and control, water resource protection, and disposal and utilization of coal-based solid wastes under the “Three Downs”.
In order to effectively release the overburden coal resources and reduce the surface subsidence in the trial management project of overburden grouting and filling at the working face of Cuizhuang Mine in Weishan, the team of Kewei Eco-overburden grouting and filling team, in response to the overburden stratum characteristics of large mining height, shallow burial depth, complex structure, and atypical key layer in the mining area, especially the harsh geological conditions of thin bedrock with a bedrock thickness of less than 60 times of the mining height, made judgments of the key layers of the complex geological conditions and selection of grouting layer positions, mining height and thickness of the bedrock and the key layers of the overburden. Through the systematic research on key layer judgment and grouting layer location selection, temporal and spatial development law of mining off-layer, drilling layout, equipment selection, grouting control process and other key core technologies, Cuizhuang Mine innovatively put forward the key technology of overburden off-layer grouting to reduce the subsidence of the overburden under the complex mining geological conditions, and the maximum subsidence of the surface of the treatment area is less than 150mm, which effectively solves the difficulties in recovering the resources of Cuizhuang Mine overburden and the many safety risks in the process of mining.
Weishan Cuizhuang Mine 73 on 01 working face overburden grouting filling test management project has recently passed the acceptance review of China Coal Society of Coal Mining Damage Technology Appraisal Committee. The expert group unanimously agreed that the project is technically feasible and the effect of surface settlement control is obvious, and suggested that it should be popularized and used in mining areas with similar conditions. The successful implementation of the project has filled the blank of the technology of off-layer filling and subsidence reduction under the geological conditions of atypical key layers, realized the effective protection of the surface structures and basic farmland in the subsidence area, achieved good social and ecological benefits, and provided strong technical support and a typical model for the safe, high-efficiency, and green mining of coal mines under the similar complex mining geological conditions.
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