• 한국산림과학회지
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• 제95권1호
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• pp.23-31
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• 2006

폐탄광지역의 식생복원에 관한 기초정보를 제공하고자 경상북도 문경시에 위치한 삼창탄광, 봉명탄광, 갑정탄광, 단봉탄광의 식생구조를 분석하였다. 중층과 하층의 출현종수는 삼창탄광이 각각 3종과 10종, 봉명탄광이 2종과 5종, 갑정탄광이 7종과 11종, 단봉탄광 9종과 12종, 그리고 대조구는 중층과 하층에 각각 15종과 17종이 출현하였다. 하층의 중요치는 삼창탄광은 참싸리, 그 외 조사지에서는 산딸기의 중요치가 가장 높은 것으로 나타났다. 초본층의 중요치는 삼창탄광은 새, 봉명탄광은 수까치깨, 갑정탄광은 참억새, 단봉탄광은 쑥과 그늘사초가 가장 높았으며 대조구에서는 실새풀의 중요치가 가장 높은 것으로 나타났다. 4개 폐탄광지역의 중층과 하층의 종다양도는 각각 0.201-0.666과 0.612-0.895로 분석되었다. 하층의 균재도는 폐탄광지역이 0.683-0.875의 범위였으며 대조구는 0.990의 균재도를 나타내었다.

• 한국환경과학회지
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• 제26권11호
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• pp.1267-1274
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• 2017

A Controlled Low-Strength Materials (CLSM) is suitable for mine backfilling because it does not require compaction owing to it high fluidity and can be installed quickly. Therefore, a CLSM utilizing $CO_2$-solidified Circulating Fluidzed Bed Combustion (CFBC) coal ash was developed and it's properties were investigated, since. $CO_2$-solidification of CFBC coal ash can inhibit exudation of heavy metals. The chemical composition and specific surface area of Pulverized coal Combustion fly ash and CFBC fly ash were analyzed. The water ratio, compressive strength and length change ratio of CLSM were confirmed. The water ratios differed with the specific surface area of the CLSM. It was confirmed that the porosity of CLSM affected its compressive strength and length change ratio.

• 한국환경과학회지
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• 제27권2호
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• pp.75-81
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• 2018

At present research on mining backfill materials is being carried out to prevent ground subsidence and breaking by underground cavern of exhausted mines. However, backfill materials can cause secondary environmental issues such as ground pollution. To solve these issues, liner and cover materials are constructed before backfill materials constructed, to inhibit toxic substances form moving to the surroundings. Liner and cover materials, however, should have an accelerating performance after construction and when the accelerating performance is degraded, the work efficiency can be lowered, and the construction cost can be increased, by many rebound content. Therefore, this study develops mining liner and cover materials, and evaluates their accelerating performance and physical properties of liner and cover materials by types and content of accelerating agent. In case of aluminate accelerating agent, it is mixed with more than 5% of liner and cover materials(binder/ratio); thus an accelerating performance satisfying Korean Industrial Standards(KS) occurs, and in case of alkali-free accelerating agent, when it is mixed with more than 7%(binder/ratio), accelerating performance satisfying KS occurs. The more the accelerating agent capacity increases, the more compressive strength decreases. In addition, it is confirmed that compressive strength of aluminate accelerating agent is more degraded than compressive strength of the alkali-free accelerating agent. It is also confirmed that drying shrinkage stability of the alkali-free accelerating agent is better than the drying shrinkage stability of the aluminate accelerating agent.