基本释义
相关例句
soft coal
3.The primary conclusion is that: the soft coal flame blackness is 0.579~0.84; the CWS (made with soft coal) flame blackness 0.621 ~0.82;
4.The paper mainly studies the working coal face stability of longwall top-coal caving in the soft coal seam by the distinct element numerical simulation software UDEC2D. The coal-cutting height is divided into five cases: 1.8m,2.0m, 2.2m, 2.5m, 2.8m and 3.2m.
5.The construction methods and caving protection measures for punching high thick and loosen soft coal seam in Luling Coal Mine No.2 dark tilt well in Huaibei Coal Mine Area are introducded.They include small section enlarged after the heading caving,high negative pressure and multi-raw drilling holes and strenous drawing-off,concentrated cross drill holes,cutting while drawing-off and putting the metal frame away.
7.A soft, brownish-black coal in which the alteration of vegetable matter has proceeded further than in peat but not as far as in bituminous coal.
8.This item adopts a convenience and more economy ground stress testing method-sound emission method (AE method), measuring the third mine section ground stress of Dongtan coal mine, estimating the maximum principal stress, the level minimum principal stress, and normal principal stress of third coal roof 40m and motherboard 30m range including the soft rock and coal bed;
9.Application of big-obliquity angle mining in three-soft seam in Shitai Coal Mine
10.Based on the characteristics of intense deformation-failure of surrounding rock in a soft and thick coal seam roadway along gob area coal mine, the structure calculating model of original rocks around a roadway along gob area is constructed by knowledge of mechanics, and various bolt-mesh-anchor supporting schemes are simulated and supporting parameters optimized, supporting schemes is proposed, which is secure and economic.