Overburden failure height of superhigh seam by fully mechanized caving methodChinese Full Text
ZHANG Hong-wei;ZHU Zhi-jie;HUO Li-jie;CHEN Ying;HUO Bing-jie;College of Mining Engineering,Liaoning Technical University;Datong Coal Guodian Tongxin Coal Mine Co.,Ltd.;Datong Coal Mine Group Co.,Ltd.;
Abstract: In order for further research on the overburden failure height of fully mechanized caving face,taking 15 mextra-thick coal seam of Tongxin Coal Mine as the research object,the demonstration was carried out by many meth-ods. Applied critical layer theory and material mechanics theory,overburden failure was analyzed as mining face mov-ing. The results show that overburden failure maximum height is 174. 6 m,the inferior key strata controlls overburdenfailure development and the main key stratum restrains overburden failure development. By adopting EH-4 magnetotel-luric methods and numerical simulation methods,the height of overburden failure was determined as 150-172 m re-sult,in consistent with theoretical calculation,theoretical calculation method can be highly effectively predicted. Thestudies show that the overburden failure height of fully mechanized caving face is 10. 0-11. 5 times the height of min-ing in Tongxin Coal Mine and key strata controlls overburden failure development.
Keywords：
extremely thick coal seam; fully mechanized caving; overburden failure height; key stratum; EH-4 magnetotelluric method;
- DOI：
10.13225/j.cnki.jccs.2013.0641
- Series：
- Subject：
- Classification Code：
TD823.254
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