Experimental Study on Supporting Effect of Filling Materials

• Published in: Shigen-to-Sozai Vol. 112; no. 9; pp. 617 - 621
• Main Authors: MURAKAMI, Takashi, SUGIMOTO, Fumio, OKUMURA, Kiyohiko, FURUZUMI, Mitsumasa
• Format: Journal Article
• Language: Japanese
• Published: The Mining and Materials Processing Institute of Japan 25.08.1996
• Subjects: Deformation of Rock; Filling; Filling Material; Sand; Strength of Rock; Tailings
• ISSN: 0916-1740; 1880-6244
• DOI: 10.2473/shigentosozai.112.617

The methods of filling with waste sand, rock and tailings have been widely utilized in the mines because of restraining the failure of pillar, lowering the subsidence of surface, minimizing roof falls and accidents due to falls, and so on. But, the supporting effect of the filling materials on the pillar in mine has not yet been clarified. In this study, the model tests are carried out unedr the low confining pressure by using the rock specimens regarded as the pillar of mine in order to investigate the deformation and strength of the pillar at the low confining pressure of filling materials and fluid. The results obtained in this study are summaried as follws; 1) In the range of confining presure from 9.8 kPa to 19.6 kPa, the maximum compressive strength of the rock specimen doesn't increase with the confining pressure, but the negative slop obtained with the filling marerial is gentler as the confining pressure increases. 2) The redisual strength of the rock specimen under the confining pressure of the filling material takes a larger value than that under unconfing or the confing pressure of fluid. Also, it is larger with increasing the axial strain. 3) Under the confining pressure of the filling material, the high confining pressure is induced near the failure plane. 4) The confining pressure of the filling material, which is induced during the failure process of the rock specimen, is larger with increasing the initial confining pressure. 5) From the experimental results with the rock specimens and the specimen made of aluminium, the effect of the filling material on restricting the failure of the pillar becomes greater in the order, wet tailings, wet sand, dry sand.