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A three dimensional influence function technique for the prediction of subsidence and horizontal displacements due to inclined seam extractions is developed. The technique is essentially a modification of the classical influence area method used for level seam excavations. The modifications include the use of an axi-symmetric influence zone formed by joining two half ellipses. Further, correction functions for panel edge and overlying goafs are also used for obtaining more reasonable prediction results. The traditional focal point theory is employed for the prediction of horizontal displacements. Predictive equations for finding the draw angles for dip side and rise side are also proposed. The developed technique is verified against two earlier published subsidence measurement case studies. The comparison between the predicted and measured subsidence values shows very good agreement for both the case examples. However, the displacement prediction using the focal point theory is found to be inadequate for inclined seam extractions.
경사채굴적에 의해 야기될 수 있는 지반의 침하 또는 수평방향으로의 변위발생을 예측하기 위하여 3차원 영향함수법이 개발되었다. 이 기법은 기본적으로 수평채굴적에서 사용되어오던 영향영역법을 일부 수정한 것으로, 기존의 영향영역법에서 수정된 내용은 두개의 반타원형을 합침으로서 형성될 수 있는 비대칭 영향대를 이용하는 것이다. 또한, 보다 합리적인 예측결과를 도출하기 위해 채굴적의 모서리나 폐석더미에 대한 보정함수를 사용하는 것도 기존의 방법에서 보완된 내용이다. 수평방향으로의 변위발생을 예측하기 위하여 기존의 초점이론이 적용되었으며, 상향 및 하향의 경사채굴적에 대하여 안식각을 예측하기 위해서는 별도의 예측식이 사용되었다. 이미 발표된 두 편의 사례연구논문을 통하여 본 연구에서 개발한 기법에 의하여 예측한 침하량과 실제로 측정된 침하량이 일치하고 있음을 검증하였다. 하지만 수평채굴적에 대하여 사용되던 기존의 예측법을 경사채굴적에 적용할 경우, 변위발생에 관한 예측값은 적절치 못함을 알 수 있었다.
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- Publisher :The Korean Society of Mineral and Energy Resources Engineers
- Publisher(Ko) :한국자원공학회
- Journal Title :Journal of the Korean Society for Geosystem Engineering
- Journal Title(Ko) :한국지구시스템공학회지
- Volume : 43
- No :4
- Pages :301-309
Journal of the Korean Society of Mineral and Energy Resources Engineers
