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Abstract Strata exploring instrument of YTJ20 was adopted for inspecting the zonal fractures inside roof strata with lateral cave，in eastern ventilation roadway No. 2222 of 1 300 m deep in Suncun mine. The results show that high level stress is the root of zonal disintegration in deep mines. Under the lateral cave condition，the quantity of fractured zones inside the high stress strata is more than that inside the meiobar of strata being in the state of unloading and large subsidence. But tensile fractures expand underneath the wide split or separation in the unloading and large subsiding strata，so the location of large-scale zonal disintegration can be determined by measuring the bedding separation. Also，the mechanical properties of strata have a great influence on the zonal disintegration；zonal disintegration is easier to occur in siltstone than in sandstone. The results supply a basis for researching the structure and mechanical features of deep key strata；and establishing the relations between zonal disintegration and rationale of rock mechanical disaster in deep mine further is also presented.
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Received: 08 January 2009
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