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Author: Admin | 2025-04-28
AbstractThe current research scrutinizes the effects of axial loading width and immediate roof thickness on the failure mechanism of a notched roof in room and pillar mining by experimental test and numerical simulation. Gypsum specimens with dimensions of 150 mm × 150 mm × 50 mm containing two rooms and a middle immediate roof (with and without the presence of an edge notch) were prepared for this purpose. The immediate roof has three different thicknesses, i.e., 30 mm, 45 mm, and 60 mm. The length of the edge notches was 1 cm, and their angles were 45°, 90°, and 135°. The upper room was loaded under axial loading with a width of 50 mm. A total of 12 physical specimens were tested. Concurrent with experimental tests, 36 numerical models were simulated. The model geometry was similar to the experimental one, but the upper room was loaded under three different axial loadings, i.e., 10 mm, 30 mm, and 50 mm. The results show that the notch angle, roof thickness, and loading width affect the failure pattern and compressive strength of models. The immediate-edged roof with an angle of 45 has a critical condition compared to other configurations. Also, models under a loading width of 50 mm have less compressive strength compared to other loading widths. The experimental test and numerical simulation show similar outcomes.Highlights The effects of axial loading width and immediate roof thickness on the failure mechanism of a notched room by experimental test and numerical simulation are investigated. Gypsum specimens with dimensions of 150 mm × 150 mm × 50 mm containing two rooms and a middle immediate roof (with and without the presence of an edge notch) were prepared. The results show that the notch angle, roof thickness, and loading width affect the failure pattern and compressive strength of models. The immediate-edged roof with an angle of 45 has a critical condition compared to other configurations. Access this article Log in via an institution Subscribe and save Get 10 units per month Download Article/Chapter or eBook 1 Unit = 1 Article or 1 Chapter Cancel anytime Subscribe now Buy Now Price excludes VAT (USA) Tax calculation will be finalised during checkout. Instant access to the full article PDF. Similar content being viewed by others ReferencesBrady BHG, Brown ET (2004) Rock mechanics for underground mining. Kluwer Academic Publishers, Dordrecht Google Scholar Chen S, Guo W, Zhou H, Shen B, Liu J (2014) Field investigation of long-term bearing capacity of strip coal pillars. Int J Rock Mech Min Sci 70:109–114Article Google Scholar Constr Build Mater 213:142–155Esterhuizen GS, Dolinar DR, Ellenberger JL (2011) Pillar strength in underground stone mines in the United States. Int J Rock Mech Min Sci 48:42–50Article Google
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