Titlebook: Coal Mine Structures; Ian William Farmer Book 1985 I. W. Farmer 1985 Catalog Service for the Web.Europe.development.distribution.fault.for

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书目名称Coal Mine Structures读者反馈学科排名

Entropion

condemn

Lecture Notes in Mechanical EngineeringThe ultimate manifestations of the process of stress distribution from excavations to abutments or pillars induced by mining are .. These are usually associated with hard rock mining but, provided the conditions for strain softening brittle fracture can be created as in Figs 1.1 to 1.3 and 1.5, similar phenomena can occur in coal mining.

MORT

Tunnels and Drifts,Tunnels and drifts, like rooms and pillars, considered in the previous chapter, are relatively simple structures which can be easily analysed. Because of this there may be a temptation to use over-simplified models to describe stress distribution.

enormous

Bursts and Instability,The ultimate manifestations of the process of stress distribution from excavations to abutments or pillars induced by mining are .. These are usually associated with hard rock mining but, provided the conditions for strain softening brittle fracture can be created as in Figs 1.1 to 1.3 and 1.5, similar phenomena can occur in coal mining.

PLIC

R. D’Amelio,O. Cosivi,D. L. Heymannt, in an engineering sense, an easily definable state and can mean either reduction in strength or excessive deformation. For instance, stronger rocks, or rocks at low confining pressures will tend to fail through fracturing, with release of energy and dilation, accompanied by a reduction in load-be

PLIC

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.

盲信者

micturition

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.

Oration

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