| Autor: |
MOHANTA, TUSHER, AKTER, SHARMIN, QUAMRUZZAMAN, CHOWDHURY, HASAN, MAHMUDUL, RAHMAN, MAHFUJUR, ARITA, NUSRAT MEHNAZ |
| Předmět: |
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| Zdroj: |
Journal of Mines, Metals & Fuels; Jan2019, Vol. 67 Issue 1, p13-17, 5p |
| Abstrakt: |
History of Barapukuria coal mine reveals a susceptible condition of subsidence that may obstruct the progressive mining activity. Along with Mohr coulomb failure criterion, authors are scrutinizing the critical stress distribution from the upper strata of minable zone amidst mine. With the steps forward action of mining, the stresses are absurdly acting on further progress which is, in other words, susceptible of subsidence. A number of graphical representations of shear strength in perception of failure load emphasizes on the vulnerable situation of subsidence that follow the similar manner of Mohr coulomb failure envelope. On account of Mohr Coulomb failure criterion, the critical pressure of above strata has estimated about 4.5 MPa whereas the actual overburden pressure is 4.67 MPa that exceed the critical value; therefore, resulting an alarming condition of destruction. The volume of the backfilling materials is equal to the volume of the void that occurs due to the extraction of coal in the central part within an area of 1.2 km². The estimated volume of backfilling materials is about 3.6×106 m³. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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