Prevention of shock bumps in deep Talnakh mines by advance extraction of a protective slice

Petukhov, I. M.; Egorov, P. V.; Rabota, É. N.; Sidorov, V. S.; Polyakov, Yu. V.; Mezentsev, K. T.

doi:10.1007/bf02539980

Cited by 2 publications

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“…(5), enable us to follow the changes in shock bump hazard with decreasing pillar size or increasing working span. For example, we easily see that in conformity with the results from mining practice in [9], it is safer to work from a pillar than "onto a pillar." The greatest hazard arises when the conditions ka > k=o, L ffi L n are simultaneously satisfied, where 2L n is the limiting pillar dimension corresponding to confluence of the zones of irreversible deformations arising at the edges.…”

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Determination of abutment pressure and assessment of stability of seam edges and pillars with postlimiting deformations

Linkov¹

1978

Soviet Mining Science

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The theory of postlimiting deformations, developed as a result of progress in rock testing methods, enables us to refine the formulation of problems concerning the calculation of abutment pressure and assessment of the stability of workings and the danger of shock bumps. In this article, we develop previous general results [i, 2]; on the one hand, we include postlimiting characteristics in the scheme of solution of the abutment pressure problem; on the other, we derive exact values of the critical combinations of parameters corresponding to loss of stability in certain particular problems. This is not only of practical utility, but also permits us to draw inferences on the error of simple approximate estimates of stability. The asymptotic expressions which we obtain and the results of our calculations will also be of interest for the theory of cracks.We will use the same formulation and notation as in [i]. The difference is that the law governing the increase of normal stresses in the zone of irreversible deformations is not specified in advance, but is found in the process of solving the equations by means of rheologlcal relations for the material of the seam when it is deformed in the postllmlting parts of the stress--strain diagrams.In a number of cases of practical importance, problems of determining abutment pressure can be reduced to a consideration of cuts, the flanks of which are subjected to loads oyy which are equal in magnitude and opposite in direction [I]. The cut includes not only the surfaces of the workings but also sections corresponding to the zones of irreversible deformations in the edge parts of the seams. For a rectilinear cut of width 2x m we have the following expression, which expresses the additional displacements v of the bottom flank, and which is easily derived from the results in [3]:x m

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confidence: 72%

Determination of abutment pressure and assessment of stability of seam edges and pillars with postlimiting deformations

Linkov¹

1978

Soviet Mining Science

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“…When the directed drift motion of kinks prevails over the chaotic diffusion, one may estimate the average kink velocity during the cycle of TLIL with x i x p at i t p [25]. We suppose below x p`0 X We receive with (1) the dislocation displacement under TLIL:…”

Section: Model Of a Dislocation Motion Under Tlilmentioning

confidence: 99%

Dislocation Kink Dynamics in Crystals with Deep Peierls Potential Relief

Iunin

Никитенко

1999

phys. stat. sol. (a)

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Prevention of shock bumps in deep Talnakh mines by advance extraction of a protective slice

Cited by 2 publications

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Determination of abutment pressure and assessment of stability of seam edges and pillars with postlimiting deformations

Determination of abutment pressure and assessment of stability of seam edges and pillars with postlimiting deformations

Dislocation Kink Dynamics in Crystals with Deep Peierls Potential Relief

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