Abstract
The roof falling accident is a serious threat to the lives of miners in deep coal mining, especially when the coal mine is more than 1000 meters deep. In regard to the 5306 coalface in the Tangkou coal mine, Shandong, China, the depth of coal seam is 992.8 m and the stress concentration coefficient of the roadway surrounding rock is 3.33. This leads to a serious deformation of the roadway roof, thereby producing a high risk of the roof falling disaster. In this pursuit, based on the mechanical analysis of roadway roof subjected to a high abutment pressure, the mathematical expressions of the setting load and movable column length of supports were introduced. Furthermore, the stability control mechanism of the roadway roof was analyzed and the optimized support parameters of supports are provided. The results showed that the longtime effective support of the roadway roof required the strength and deformation coupling of supports and anchored surrounding rock. The support length of the belt roadway should be at least 57.7 m, with 0-30 m away from the coalface supported by hydraulic supports and 32-57.7 m supported by single props. In addition, the maximum setting load and movable column length of hydraulic supports were 21.67 MPa and 280.3 mm and 12.44 MPa and 177.1 mm for single props, respectively. By applying the optimized support parameters of supports to the belt roadway of the 5306 coalface, the effective control of the roadway roof and the disaster control of roof falling were realized.
Highlights
Roof falling accident has always been one of the major mine disasters that pose threats to the life of the underground miners in coal mining [1]
Based on analysis of the relation between the hydraulic support and the anchored surrounding rock, theoretical values were set for the setting load and movable column length (Figure 10) in the roadway subjected to the front abutment pressure of the belt roadway in the coalface 5306 of the Tangkou coal mine
Roadway deformation and failure, such as roadway roof fracture, roof falling, settlement, roof separation, and extrusion of coal sides, were likely to occur, when inappropriate roadway support parameters were used in the roadway subjected to front abutment pressure, thereby seriously influencing the coal mining and the safety of miners
Summary
Roof falling accident has always been one of the major mine disasters that pose threats to the life of the underground miners in coal mining [1]. The study of the relation between supports and anchored surrounding rock subjected to front abutment pressure and the effective control of roadway roof in the coalface are of great significance to reduce the roof falling disaster and ensure the safety of the miners in coal mines. A small setting load caused a large settlement of the roof, resulting in the falling of the roof [19] Even though these studies clarified the interaction between the hydraulic supports and the surrounding rock in the coalface, the supports in the roadway subjected to front abutment pressure present some features that are different from the coalface. The support parameters were optimized to ensure the safety of the miners and for a sustainable mining in the Tangkou coal mine
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