Abstract
Using the spatial structure of the external staggered split-level panel layout, a combined support technology for adjacent roadways was developed and analyzed for a rock bolt and anchor cable mechanism. The influence of the side rock bolt and anchor cable parameters on the mechanical properties of the anchorage body and the support stress distribution of the lateral coal body were revealed using the FLAC3D software. The optimal support parameters of the side rock bolts and anchor cables were subsequently determined, and the support effect of gob-side entry in a mining scenario was verified. The results show that the support of the side rock bolts and anchor cables improves the mechanical properties and stress state of the anchorage body, producing a good protective effect on the coal body of the air-intake entry roof and side wall. This is beneficial to the stability of the side wall and the realization of the suspension effect for roof rock bolts and anchor cables, which in turn makes the surrounding rock maintenance of the gob-side entry to a thick coal seam more favorable.
Highlights
In recent years, the increasing demand for coal and the increased efficiency of coal production have led to a gradual shift from shallow to deep coal mining activities (Xie et al 2015; Aghababaei et al 2019; Ju et al 2019)
The results show that the support of the side rock bolts and anchor cables improves the mechanical properties and stress state of the anchorage body, producing a good protective effect on the coal body of the air-intake entry roof and side wall
The roadway used for fully mechanized top coal caving faces the problem of controlling the surrounding rock to protect against rock burst, the influence of mining operations, and soft, thick coal roofs, which are prone to significant deformation and instability (Guo et al 2019; Lu et al 2019)
Summary
The increasing demand for coal and the increased efficiency of coal production have led to a gradual shift from shallow to deep coal mining activities (Xie et al 2015; Aghababaei et al 2019; Ju et al 2019). The width of the internal stress field and three fracture forms that occur in the overlying main roof were researched to determine the optimal position for gob-side entry (Li et al 2012; Wang et al 2014). In terms of roadway support technology, rock bolts and anchor cables have become the main form of roadway support in coal mines. In this study, based on the combined support technology used in ESSPL, the geological conditions of Xinjulong Mine, Shandong Province, China, were taken as the research object to investigate the combined support mechanism of rock bolts and anchor cables. This paper focuses on the influence of the side rock bolt and anchor cable parameters on the mechanical properties of the anchorage body and the distribution characteristic of the support stress field, respectively, and verifies the support effect under the influence of mining
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