Failure Characteristic and Fracture Evolution Law of Overburden of Thick Coal in Fully Mechanized Sub-level Caving Mining

• DOI: 10.17576/jsm-2017-4611-04
• Publication Date: 2018-01-20T06:44:04Z
• Authors: Xiaolei Wang; Qirong Qin; Cunhui Fan
• Keywords: Overburden

In mining process, the height of water flowing fractured zone is important significance to prevent mine and gas, in order further research failure characteristic overlying strata.Taking certain coal with 5.82 m as experimental face, by using equipment which sealed two ends capsules borehole, affused measurable between borehole televiewer system, ground penetrating radar, microseismic monitoring system underground mine, fully-mechanized top caving are monitored, a numerical simulation experiment on process was conducted, similarity cracks evolution at same time, empirical formula traditional modified, The results showed that zones were respectively 43.1 86.7 fully mechanized sub-level mining.The data difference each test method caving, less than 4.5%, 7.1% 9.0%.The degree fracture development low before mining, number fissures obviously increased after increased.The fractures cluster region mainly focuses near wall.The density distribution curves strata like sanke-shapes.The new adapt geological conditions proposed.