A Study on the Mechanical Behaviour of Broken Rock

Research Project

Project/Area Number	60460188
Research Category	Grant-in-Aid for General Scientific Research (B)
Allocation Type	Single-year Grants
Research Field	資源開発工学
Research Institution	University of Tokyo
Principal Investigator	YAMAGUCHI Umetaro University of Tokyo, 工学部, 教授 (60010740)
Co-Investigator(Kenkyū-buntansha)	MOGI Gento University of Tokyo, 工学部, 助手 (70182160) SHIMOTANI Takakoto University of Tokyo, 工学部, 助教授 (30011125)
Project Period (FY)	1985 – 1986
Project Status	Completed (Fiscal Year 1988)
Budget Amount *help	¥5,500,000 (Direct Cost: ¥5,500,000) Fiscal Year 1986: ¥2,800,000 (Direct Cost: ¥2,800,000) Fiscal Year 1985: ¥2,700,000 (Direct Cost: ¥2,700,000)
Keywords	Mine opening / Fissured rock mass / Powder technology / Broken rock / Compaction / せん断強度 / 採掘空洞
Research Abstract	This study was aimed to isvestigate the mechanical behaviour of broken rock which was like heavily deteriorated rock mass sourrounding an underground opening and also like once-brocken and again compacted rock material filled in a mine opening. This study consisted of following two destinations; A study on the mechanical behaviout of unconcreted compacted solid, and A study on the mechanical behaviour of rock mass including a weak and soft seam. In the former study, unconcreated compacted solid body was built by compacting and loading broken rock aggregate (limestone frgments) in a steel vessel. And it was concluded that it was the limit to make 85 % compacted and 20 % Young's modulus solid compared to the original solid limestone, by this method, due to the pores and cracks included in the solid body. And then, in "a study on the mechanical behaviour of rock mass including a weak and soft seam", it was concluded that, in the case in which different rock seams were contacting, mechanical behaviour of seam rocks were mutually affected and in the particular case in which there was a large value of /E of rock ( :Poisson's ratio and E:Young's modulus), the effect was intensified to the stronger rock was broken coincidently with the weaker rock broke. In this study, several new knowledges were obtained and furthermore hoped possibilities to study the mechanical behaviour of heavily broken rock mass from the other angles were concluded.