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Abstract By accident investigation，theoretical analysis and field measurement，this paper studies the occurrence mechanism，control methods，the risk?s regionalization and grading evaluation method of abnormal weighting in fully mechanized/caving face of deep shaft. Following results are obtained：(1) The main affecting factors of abnormal weighting in working face are roof weighting，roof water，roof control distance increasing，low setting load，mining height change，fault，advance speed and the superposition of these factors. (2) The occurrence mechanism of abnormal weighting was the imbalanced relationship between roof structure and support，which caused by these factors and result in roof abnormal activities and support subjected to abnormal forces. (3) The control methods of abnormal weighting are evaluated before mining，pretreatment risk area，implement mine pressure observation in the process of mining，reducing the risk by using roll steering working face，reduce mining height properly，improving setting load，draining water or strengthening the roof in advance，pre-splitting roof，accelerating advance speed and optimizing support resistance，ect. The research results have been applied to Zhaolou coal mine coal face 1306 with a good result，so as to avoid the support crushing accident effectively.
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Received: 30 January 2013
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2013, Vol. 32 
