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进行水体下采煤时,防水煤岩柱计算公式为: H_柱=H_裂+H_扒+H_保式中 H_裂——导水裂高; H_保——保护层厚度; H_扒——地表扒缝深度。由上式看出,扒缝深度与防水煤岩柱尺寸有关。预计时一般取10～30米。但在具体条件下如何计算?下面进行探讨: 一、地表扒缝深度的计算地下煤层开采后,地表有时形成裂缝,如果煤层为水平、缓倾斜或倾斜,其裂缝形式大体分为三种:张口裂缝、压密裂缝、漏斗状塌陷坑。压密裂缝导水性能很差。对断层引起的裂缝可用采矿措施处
When conducting coal mining under water, the formula of waterproof coal pillar is: H_pillar = H_crack + H_palad + H_type H_crack - water crackle height; H_protection - protective layer thickness ; H_ Grilled - surface pavement depth. As can be seen from the above formula, the depth of the stripping seam is related to the size of the waterproof coal pillar. Estimated time to take 10 to 30 meters. However, under specific conditions, how to calculate? The following discussion: First, the calculation of the depth of the ground surface sutured seam After the underground coal seam mining, the surface cracks sometimes formed, if the coal seam is horizontal, gently inclined or inclined, the cracks are divided into three types: Cracks, cracks, funnel collapse pit. Compaction cracks poor water conductivity. Available mining measures for cracks caused by faults