发明名称 |
Method for determining mine roof competency |
摘要 |
Mine roof competency is determined by injecting a pressurized gas into a borehole drilled in the roof of the mine and measuring the rate of pressure loss. A high rate of pressure loss is indicative of a dangerous mine roof. A tracer gas may also be injected into the borehole to determine the extent of cracks in the roof if a dangerous condition has been determined.
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申请公布号 |
US4686849(A) |
申请公布日期 |
1987.08.18 |
申请号 |
US19850805772 |
申请日期 |
1985.12.06 |
申请人 |
CZIRR, JOHN B. |
发明人 |
CZIRR, JOHN B. |
分类号 |
E21B47/10;E21B49/00;E21F17/18;(IPC1-7):G01N15/08;G01N19/08 |
主分类号 |
E21B47/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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