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1.
公开(公告)号:US4726712A
公开(公告)日:1988-02-23
申请号:US722240
申请日:1985-04-11
申请人: Friedrich Sill , Ulrich Kramer , Hans Maurer
发明人: Friedrich Sill , Ulrich Kramer , Hans Maurer
CPC分类号: E21F15/08
摘要: In conjunction with the face mining of bituminous coal, previously excavated or some portions of the tunnel are collapsed in a manner to form a mass of debris into which a mixture of electrostatic filter ash and water is injected to stabilize the structure.
摘要翻译: 随着沥青煤的开采,结合先前挖掘的隧道或隧道的一些部分以形成大量碎屑的方式折叠,静电过滤灰和水的混合物注入到其中以稳定结构。