1997 Fiscal Year Final Research Report Summary
In Situ tests to Determine the Ground Pressure Existing in a Soft Rock Mass by Use of Hydraulic Borehole Cells.
| Project/Area Number |
08555254
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
資源開発工学
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| Research Institution | AKITA UNIVERSITY |
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Principal Investigator |
YAMASHITA Shigeru AKITA UNIVERSITY,MINING COLLEGE,PROFESSOR, 鉱山学部, 教授 (90001213)
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| Co-Investigator(Kenkyū-buntansha) |
KATHO Harumi DOWA ENGINNERING CO., LTD., DIRECTIVE ENGINEER, 地下開発本部, 課長
IMAI Tadao AKITA UNIVERSITY,MINING COLLEGE,INSTRUCTOR, 鉱山学部, 助手 (00250895)
SUGIMOTO Fumio AKITA UNIVERSITY,MINING COLLEGE,ASSOCIATE PROFESSOR, 鉱山学部, 助教授 (80124585)
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| Project Period (FY) |
1996 – 1997
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| Keywords | Soft rock / Ground pressure / In situ measurement / Ground pressure in soft rock / Hydraulic borehole cell / Cracks of rock |
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| Research Abstract |
In situ tests are conducted for adopting the measuring system of ground pressure existing in a soft rock mass by use of hydraulic borehole cells, which had been developed by Dr.P.H.Lu in U.S.Bureau of Mines.
This system is consisted from a set of hydraulic borehole pressure cells and hydraulic pressure gauge, hydraulic pressure pomp. And the borehole pressure cells are consisted from a cylindrical pressure cell (CPC) and two flat type pressure cells (BPC).
This projects were held by two years. At the first year, physical and mechanical properties of these pressure cells were measured and the properties were re-arranged by these measurements. And at the second year, in situ measurement of ground pressure were conducted by two rock mass sites, the one was on an rock pillar in underground pit (volcanic tuff, covered rock = 120m), and the other was underground drift face of a coal mine (shell, covered rock = 600m).
The measured ground pressures of these sites were nearly equal to calculated value of theoretically. But, there were some troubles on a working of inserting the pressure cells in the drilled borehole, when inner wall of the boreholes were not smooth by the large or small cracks in the rock mass.
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Research Products
(2 results)
