essential-fats
发表于 2025-3-28 18:37:09
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obviate
发表于 2025-3-28 20:13:37
Tunnel support analysis,k and to ensure the security of the opening. If the rock is not competent, in the absence of the lining, very often failure may occur as a final result of excessive deformation (wall convergence). Sometimes, even in the presence of the lining, structural failure may occur as a result of excessive pr
canonical
发表于 2025-3-28 22:54:58
Elastic/viscoplastic constitutive equations,e domains. The experimental data reveal some specific mechanical properties of rocks which cannot be described by either of the constitutive equations presented in the previous chapters. Some of these properties are not even described qualitatively, while others are poorly described quantitatively.
季雨
发表于 2025-3-29 04:20:27
Creep and dilatancy/compressibility of rocks around vertical shafts and oil wells,indrical vertical orifice drilled in a semi-infinite space. Cylindrical coordinates ., ., . will be used, with the 0.-axis coinciding with the axis of the well and directed vertically downward. The initial raidus of the well is . = ..
assent
发表于 2025-3-29 08:47:39
Creep and dilatancy/compressibility of rocks around horizontal tunnels,round holes made through elastic plates (see Habib (1973)). Thus the problem was assumed to be a plane stress problem. The first solution seems to have been obtained by G. Kirsch in 1898 (for the history of the problem, see Obert and Duvall (1967)).
occurrence
发表于 2025-3-29 15:02:38
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一条卷发
发表于 2025-3-29 16:37:38
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Paleontology
发表于 2025-3-29 21:36:04
Volume deformation,) and stress-states of interest in mining applications, the irreversible volumetric strain is mainly due to microcracks. In other words we assume that the . (microcrack density change, microcrack formation and/or closure, etc.). Sometimes, however, pores also play a significant role in the irreversible volume change.
CLAIM
发表于 2025-3-30 02:31:55
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Gesture
发表于 2025-3-30 05:12:57
0924-2163 re accurately the slow irreversible deformation in time of the rocks surrounding underground openings. To begin with, our efforts were directed toward a better under standing of the mechanical behaviour of rocks and to the formulation of more precise mathematical models for their dominant mechanica