(1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454000，China；2. Heilongjiang Vocational and Technical College of Coal，Shuangyashan，Heilongjiang 155100，China)
Abstract：Taking Sihe No.2 mine as the experimental mine，by using the equipment which is sealed two ends by capsules in borehole，affused measurable water between the two capsules and borehole televiewer observation system，overburden caving zone height of mining overall height in one times is monitored and analyzed through the digital relationship of fractures around mining such as change of dip angle，numbers and width，depth and width，numbers and depth. At the same time，similarity model experiment of fracture development character is carried out. The results show that caving zone height changes from 4.1 to 4.8 m. The fractures with small angle and middle width after mining are in the majority. With increase of the mining of working face，the numbers of fractures increase linearly. The fractures cluster region mainly focuses near the coal wall. The fractures density distribution curves of overlying strata like sanke-shapes.
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2014, Vol. 33 
