关键词: 导水裂缝带, 现场观测, 层位结构, 层向拉伸率

Abstract: The upper strata structure is anisotropic and layered. The permeable fractured zone is developing according to each rock layer’s bending and subsidence. So, the permeable fractured zone's height is sum of each rock layer’s thickness. To determine this height accurately, the strata layer criterion was proposed. This paper took one working face as example, measuring the permeable fractured zone’s height in field, calculating each rock layer’s tensile rate, then determined the top layer in permeable fractured zone is limestone layer which horizon height is 36.86m, tensile rate is 0.42. This limestone layer’s tensile rate is the inflection point of each layer tensile rate’s changing trend. At last, we determine the permeable fractured zone's height is 36.86m.

Key words: permeable fractured zone, measure in field, layer structure, tensile rate