Experimental study on characteristics of broken caving and regularity of compaction deformation of rocks in caving zone in the weakly cemented strata

The rocks properties of broken, caving, compaction, consolidation are important influence factors on the height variation of caving zone. Based on the broken rocks compression experiment and rocks disintegration experi-ment,the different types of rock broken and disintegration properties were studied,the rock time-deformation character-istics and process of swelling-deformation and broken-caving and filling-compaction and consolidation were analyzed, the differences between rock deformation and failure were revealed in Western and Eastern China. The results show that the weakly cemented rock has the characteristics of strong expansion and easy disintegration,weakly cemented rock is easily broken than the Middle Eastern rock,resistant disintegration index of weak cemented rock is smaller than Middle Eastern rock,The relationship of the disintegration index of the rock was linear decreasing with the increase of the number of disintegration cycles;under the same mining height condition,the initial height of caving zone of work face in the weakly cemented strata is smaller than in Middle Eastern areas,the variable quantity of caving zone height is larger after caving zone tends to be stable for weakly cemented strata work face,the characteristic is stronger if ce-mentation of cement rock is poorer. The results of similar simulation experiment also proved the reliability of this theo-retical analysis.