大漩涡
发表于 2025-3-30 10:03:19
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Migratory
发表于 2025-3-30 13:12:10
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pantomime
发表于 2025-3-30 18:21:38
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思想灵活
发表于 2025-3-30 21:52:11
Pre-mining state of stress,nventional surface structures, the geometry of the structure and its operating duty define the loads imposed on the system. For an underground rock structure, the rock medium is subject to initial stress prior to excavation. The final, post-excavation state of stress in the structure is the resultan
芭蕾舞女演员
发表于 2025-3-31 04:16:25
Methods of stress analysis,on of stoping procedures for ore extraction. These issues are not mutually independent. However, geomechanics questions concerning stoping activity may be more pervasive than those related to the siting and design of permanent openings, since the former persist throughout the life of the mine, and p
assail
发表于 2025-3-31 08:06:59
Excavation design in massive elastic rock,rusher chambers and underground workshop space. They are characterised by a duty life approaching the mining life of the orebody. It is therefore necessary to design these openings so that their operational rôle can be maintained at low cost over a relatively long operational life.
山顶可休息
发表于 2025-3-31 12:43:51
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nepotism
发表于 2025-3-31 14:00:52
Excavation design in jointed rock, of joint sets which define the degree of discontinuity of the medium, or the presence of a discrete structural feature transgressing such a simply jointed system as a cross-jointed, stratified mass. The problem which arises in these types of media is the generation of distinct rock blocks, of vario
AGONY
发表于 2025-3-31 18:00:32
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亚当心理阴影
发表于 2025-3-31 23:17:39
Rock support and reinforcement,ck near the boundaries of underground excavations. As will be shown in this chapter, the primary objective of support practice is to mobilise and conserve the inherent strength of the rock mass so that it becomes self-supporting. The procedures and materials used in this case may be more correctly d