连词
发表于 2025-3-28 17:30:36
Stress and infinitesimal strain,k by any excavation and ore extraction processes. The rock in which excavation occurs is stressed by gravitational, tectonic and other forces, and methods exist for determining the ambient stresses at a mine site. Since the areal extent of any underground mine openings is always small relative to th
Conjuction
发表于 2025-3-28 22:03:56
Rock mass structure, a clear distinction must be made between the rock element or rock material on the one hand and the rock mass on the other. . is the term used to describe the intact rock between discontinuities; it might be represented by a hand specimen or piece of drill core examined in the laboratory. The . is t
担忧
发表于 2025-3-29 01:00:06
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occurrence
发表于 2025-3-29 03:42:31
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上腭
发表于 2025-3-29 08:20:47
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蚀刻
发表于 2025-3-29 14:03:48
Excavation design in massive elastic rock,irways, crusher 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.
anatomical
发表于 2025-3-29 16:52:57
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追踪
发表于 2025-3-29 22:35:29
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
seduce
发表于 2025-3-30 01:14:59
Energy changes accompanying underground mining,n all cases, a design objective was to achieve a static stress distribution, or a set of static forces on discontinuity-defined internal surfaces, which could be sustained by the constituent elements of the rock mass. This approach would be completely satisfactory if the stress concentrations which
核心
发表于 2025-3-30 07:40:08
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