高原
发表于 2025-3-23 12:46:24
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intrigue
发表于 2025-3-23 15:16:19
https://doi.org/10.1007/978-94-010-0830-3 of a room and pillar mine layout, or can be designed as a support element in a different type of mine layout. In Europe, these pillars tend to be used between longwall faces to protect access roads, while in the United States the multiple entry system utilizes two or more support pillars.
CULP
发表于 2025-3-23 21:13:12
Lecture Notes in Networks and Systemsa horizontal axis. Vertical shafts are inclined normally to most Coal Measures strata, and often pass through overlying aquifer rocks. Insets are large structures often formed at considerable depths in weak but dry Coal Measures rocks.
Aerate
发表于 2025-3-23 23:35:32
https://doi.org/10.1007/978-3-030-47945-9nstruction. They may be unique in so far as the rocks of the Coal Measures cyclothem and their associated geological structures are unique. But the simplifying assumptions used in design indicates that this uniqueness is of a low order.
doxazosin
发表于 2025-3-24 05:00:43
L. V. Divone,A. H. Rosenfeld,F. E. Wood Jr. the roadway is always in front of the retreating face. Because of this the roadway is generally in a zone of relatively low stress. In the case of . longwall faces, roadways are formed from the extraction zone at the sides of the longwall excavation, and the useful part of the roadway is generally in a zone of high stress.
macrophage
发表于 2025-3-24 10:16:17
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善于骗人
发表于 2025-3-24 13:24:21
Design of Rooms and Pillars, of a room and pillar mine layout, or can be designed as a support element in a different type of mine layout. In Europe, these pillars tend to be used between longwall faces to protect access roads, while in the United States the multiple entry system utilizes two or more support pillars.
Delectable
发表于 2025-3-24 15:30:35
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Incisor
发表于 2025-3-24 20:34:30
Strata Deformation above Longwall Excavations,nstruction. They may be unique in so far as the rocks of the Coal Measures cyclothem and their associated geological structures are unique. But the simplifying assumptions used in design indicates that this uniqueness is of a low order.
法官
发表于 2025-3-25 00:39:12
Access Roadways and Roadside Packs, the roadway is always in front of the retreating face. Because of this the roadway is generally in a zone of relatively low stress. In the case of . longwall faces, roadways are formed from the extraction zone at the sides of the longwall excavation, and the useful part of the roadway is generally in a zone of high stress.