Abstract
In condition of extraction roadway with existing bolt support at Zhao Lou coal mine as the object, the substantial function and evolution mechanism of anchor rod and anchorage structure are studied by using a variety of means; perfected suggestions about roof separation indicator are put forward; the separation phenomenon and the bolt support structure interaction state and the correlation of roadway stability are researched; method of determination of the critical value of roof separation are put forward and the criterion of the bolting structure failure and surrounding rock losing stability of roadway with the bed-separation volume as the main indicator are provides the basis for.
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