关键词: 切顶卸压自成巷, 巷旁切顶, 下位顶板, 3DEC软件

Abstract: The roadside roof cutting interrupts the continuity between the roadway and the lower roof, promoting the collapse of the lower roof to form a gravel gang. It is of great significance to study the influence mechanism of roof cutting on the caving characteristics of lower stope strata. In this paper, the stope support load was analyzed, the mechanical modeling of the overlying strata was carried out, and the relationship between the movement of the overlying strata and the stope support load characteristics at typical positions was clarified. On this basis, the load data of supports at typical positions were given for six working faces with roadway side roof cutting, so as to analyze the influence mechanism of the roadside roof cutting on the collapse characteristics of the lower strata in the stope. Meanwhile, a numerical model was established, taking into account the different starting positions of roof cutting and the strength of the lower roof, and further analyzed the effect of roadside roof cutting on the collapse of the lower strata. The results show that the "caving line" of the 121 method has a symmetrical arc boundary, the "caving line" of the 110 method is entirely moved to the working face on the roof cutting side, and the N00 method is between the above two. In addition, there are differences in the effect of roof cutting under different roof cutting starting positions and roof strength conditions. The research results are conducive to further deepening the understanding of the effect of roadside roof cutting on the caving characteristics of the lower stope strata.

Key words: gob-side entry retaining automatically formed by roof cutting and pressure release, roadside roof cutting, lower roof, 3DEC soft