Backfilling technology in Kazakhstan mines

Krupnik, L. A.; Shaposhnik, Yu. N.; Shaposhnik, S. N.; Tursunbaeva, A. K.

doi:10.1134/s1062739149010103

Cited by 19 publications

(9 citation statements)

References 1 publication

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“…The essence is to replace coal resources with filling materials and thus control surface subsidence. 9 In the eastern plain area of China, the filling mining method has been widely used in mining areas where there is a large distribution density of villages due to the shortage of minable coal resources. [10][11][12] With the gradual reduction of available filling materials and the increase of filling costs, many coal mines now use the strip mining method to mine 3U coal seams.…”

Section: Introductionmentioning

confidence: 99%

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Ning

Wang

Pan

et al. 2020

Energy Science & Engineering

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The strip filling mining method can solve the problems related to mining under structures, under aquifers, and under infrastructure (3U coal seams), while the reasonable selection of the mining and filling sequence still requires further investigation. The current study was conducted to investigate the stress and surface subsidence of a filling body (or coal pillar) under two filling sequences through theoretical analysis, similar simulation tests, and numerical simulations. To achieve optimal filling materials for the Liudong Coal Mine, a low-strength similar paste filling material composed of fly ash, gypsum, and sand was developed. The relationships between the strength and the cement ratio and between the strength and the sand-binder ratio were discussed. Similar simulation tests showed that mining scheme 1 (mining before filling) could lead to the formation of an isolated island coal pillar in the mining process, mining scheme 2 (filling before mining) had less influence on surface subsidence, and the stress on the filling body was smaller for scheme 2 than for scheme 1. The distributions of the stress and plastic zone in the two different mining and filling sequences were obtained through numerical simulations. The method of first filling and then mining could greatly reduce the stress concentration and plastic zone during the mining process. In summary, mining scheme 2 (filling before mining) can avoid the formation of isolated island coal pillars in the process of mining, and without considering other factors, scheme 2 should be adopted as much as possible.

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Section: Introductionmentioning

confidence: 99%

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Ning

Wang

Pan

et al. 2020

Energy Science & Engineering

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“…To maintain mine workings with limited volumes of rock in underground conditions, it is proposed to use a solidifying backfill [22]. Such a solution in certain mining-andgeological conditions, ensures the maintenance of mine workings due to the use of a solidifying support, in comparison with other protecting methods.…”

Section: Recent Research and Publications Analysismentioning

confidence: 99%

Experimental characteristics for deformation properties of backfill mass

Iordanov¹,

Novikova²,

Simonova³

et al. 2020

Min. miner. depos.

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Determining the deformation properties of backfill mass used to preserve the continuity of the coal-rock stratum enclosing mine workings. Methods. To achieve the purpose set, laboratory studies have been performed on crushed rock samples with different granulometric composition, which are exposed to uniaxial compression in a steel cylinder. The experimental data are processed using the mathematical statistics methods. Findings. As a result of performed laboratory studies, it has been determined that during compression pressure of the backfill material from crushed rock, the deformation modulus is a variable value and depends on the value of the applied load, which means that it cannot be used as a physical characteristic of the backfill mass. It has been proven that the deformation modulus characterizes the backfill mass rigidity, that is, its ultimate stress state. The rigidity value under a constant external load, can be regulated using the granulometric composition of the crushed rock. It has been revealed that the maximum shrinkage of the backfill mass is achieved when repacking crushed rock fractions of different sizes under volume compression of the backfill material. In the case when the backfill material is a homogeneous fraction of crushed rock, when increasing the constrained modulus, the backfill mass rigidity increases, and shrinkage decreases. Originality. It has been proven that the values of the crushed rock compaction coefficient, which characterizes the shrinkage of the backfill mass, are correlated with a parabola and depend on the granulometric composition of the source material. With inhomogeneous granulometric composition, the compaction coefficient values are maximum, and for backfill material with the similar fraction, they decrease with a change in the bulk density of the crushed rock. Practical implications. To ensure the side rocks stability and to maintain mine workings in an operational state, it is necessary to ensure a uniform by volume granulometric composition inhomogeneity of the crushed rock. This determines the ability of the roof and bottom of the coal seam to effectively respond to the impact of external factors that are manifested in the mass of sedimentary rocks during mining operations.

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“…Для повышения безопасности ведения горных работ подземным способом производят закладку выработанного пространства с использованием в качестве закладочных материалов цемента, песка и воды [8,9]. В качестве альтернативных компонентов закладки используют отходы обогатительных фабрик -шлам и тепловых электростанций -золу [10,11].…”

Section: анализ исследований и публикацийunclassified

“…Пользуясь уравнением(9), можно, зная температуру в два периода времени, определить значение m. Затем в соответствии с теорией Кондратьева Г. М. вычислить величину коэффициента температуропроводности α из уравнения По продольной оси образца просверливался канал диаметром 4 мм, длиной 50 мм, в который помещался спай термопары. Для лучшего контакта спая термопары с образцом в канал вводилась капля ртути.…”

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Influence of extraction chambers backfilling on microclimat of deep mines

Лапшин¹

2014

EEJET

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Для підвищення безпеки підземних робіт здійснюється закладення виробленого простору, гідратація закладки супроводжується виділенням тепла. Розглядається спосіб зниження температури шляхом додавання до закладки здрібнених гірських порід. Це дозволяє знизити до 10 м зону впливу процесів гідратації закладки на температурний режим оточуючих гірничих виробок Ключові слова: мікроклімат, нормалізація, провітрювання, закладка, гідратація, теплофізичні параметри, температура,вологість Для повышения безопасности подземных работ производится закладка выработанного пространства, гидратация которой сопровождается выделением тепла. Рассмотрен способ снижения температуры путем добавления в закладочную смесь измельченных горных пород. Это позволяет снизить до 10 м зону влияния процессов гидратации закладки на температурный режим примыкающих горных выработок Ключевые слова: микроклимат, нормализация, проветривание, закладка, гидратация, теплофизические параметры, температура, влажность

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Backfilling technology in Kazakhstan mines

Cited by 19 publications

References 1 publication

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Modeling study on the influence of the strip filling mining sequence on mining‐induced failure

Experimental characteristics for deformation properties of backfill mass

Influence of extraction chambers backfilling on microclimat of deep mines

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