堤体下采煤技术研究

Study on coal mining technology under the dyke

应用实地观测的方法对开采引起的堤坝的移动变形、堤坝产生突然沉陷的可能性及开采引起的堤坝裂缝的发育等专门问题作了研究。研究结果表明:受采动影响的堤坝距开采煤层的距离大于两倍的导水裂缝带高度时,堤坝具有整体、缓慢沉陷的特点,不会产生突然沉陷;堤体内部不会产生裂缝,仅存在疏松带;堤体表面的裂缝发育到一定深度后尖灭。还提出了裂缝位置及发育深度的计算公式,列举了堤坝下采煤的一个实例。

This thesis is based on the field observation data, the displacement and deformation of the dyke, the probability of sudden subsidence of the dyke ,the developing rules of fissures aroused by mining and researched. The researching result shows that when the distance between the coal seam and the dyke influenced by mining is bigger than the height of twice of fracture zones of hydraulic conductivity, the dyke can＇t appear sudden subsidence. There are not fissures inner the dyke. The fissures in the surface will disappear in certain depth. This thesis provides the formula about the position and depth of fissures. At last, an example is provided.