Mining limit of lower coal seams to stability of upper dip entries
Stability of dip entries may be influenced by mining degree of lower coal seams indirectly. Three dip entries in upper coal seam are safe under their initial conditions. But coal mining in lower coal seam which straight distance is 57 m may influence these dip entries. On SAW-2000 Electro-hydraulic Ser vo-controlled Rock Mechanics Testing System, uniaxial and triaxial tests were executed to give numerical calculation mechanical parameters of rocks. By three dimensional numerically method, special models are constructed to simulate laws of stresses, deformation and plastic zone. Deformation of dip entries presents that the key width of coal pillar to rock stable is 9m, and the maximum extracted width of lower coal seam is 27m. zz-stress states in central plane of numerical models verify results from deformation of dip entries, which is valuable to coal mining engineering.
mining limit dip entry coal seam simulation coal pillar
Lijun Zhang Chuanxiao Liu Yunliang Tan Meizheng Zhang
Binhu Colliery, Zaozhuang Mining Engineering Co.,LTD,Tengzhou 277500, China College of Water Conservancy and Civil Engineering, Shandong Agricultural University, Taian 271018, Institute of resource and environment engineering, Shandong University of Science and Technology, Qi
国际会议
重庆
英文
228-234
2009-05-20（万方平台首次上网日期，不代表论文的发表时间）