Abstract
Because top coal is not stable, a roadway with thick top coal often appears to mine pressure problems, such as bolt failure, cable breakage, and roof caving. In particular, these problems are more serious in rockburst mines. Based on a cable breakage case of No. 3 roadway in Xingcun coal mine, the paper analyzed the stress and elastic energy evolution law of surrounding rock and stress state of cable in the 3# roadway by means of the numerical simulation method. Thus, the cable breakage mechanism of the roadway with thick top coal in rockburst mine was revealed. Then, because surrounding rock grouting can reduce the stress concentration of surrounding rock and cable, surrounding rock grouting technology was proposed as control technology of cable breakage. Finally, parameters of surrounding rock grouting were designed and applied in the No. 3 roadway. The field results showed that surrounding rock grouting technology can be one of the solutions for cable breakage of roadway with thick top coal in rockburst mine. The research results of this paper can provide certain theoretical and practical value for mine pressure control of roadway.
Highlights
In China, with the increase of coal seam mining depth and intensity, there are more and more rockburst mines
In the recent roadway excavation project, cable breakage occurred in the No 3 exploration roadway in the seventh mining area of the Xingcun coal mine. e roadway adopted a straight wall circular arch section with 4300 mm width, 3000 mm straight wall height, and 700 mm circular arch height (Figure 1). Because it was driven along the floor of the coal seam, its roof was reserved with about 4.8 m top coal
The thick top coal of roadway was mainly deformed and difficult to control surrounding rock, which was like other thick top coal roadways in other coal mines [21, 22]
Summary
In China, with the increase of coal seam mining depth and intensity, there are more and more rockburst mines. According to statistics of the China National Administration of Mine Safety, there are currently about 138 rockburst mines In these rockburst mines, the problem of mine pressure is more serious. Li et al [11] studied the influence of geological and mining technology factors on the rockburst formation based on the analysis on the occurrence characteristics of rockburst in Qianqiu coal mine. Erefore, the Advances in Civil Engineering occurrence mechanism, characteristics, and prevention technology of general rockburst should receive more attention, for example, high energy microseismic activity [13, 14], coal crack with firecrackers or thunder sound [15, 16], and breakage of bolt or cable [17, 18]. After that, grouting technology and parameters of cable breakage control were designed and applied in the No 3 roadway. e research results can provide certain theoretical and practical value for mine pressure control of roadway, especially in rockburst mines
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