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Geomechanics and Engineering
  Volume 22, Number 4, August25 2020, pages 349-359
DOI: http://dx.doi.org/10.12989/gae.2020.22.4.349
 


Numerical investigation on overburden migration behaviors in stope under thick magmatic rocks
Yanchao Xue, Quansen Wu and Dequan Sun

 
Abstract
    Quantification of the influence of the fracture of thick magmatic rock (TMR) on the behavior of its overlying strata is a prerequisite to the understanding of the deformation behavior of the earth\'s surface in deep mining. A three-dimensional numerical model of a special geological mining condition of overlying TMR was developed to investigate the overburden movement and fracture law, and compare the influence of the occurrence horizon of TMR. The research results show that the movement of overlying rock was greatly affected by the TMR. Before the fracture of TMR, the TMR had shielding and controlling effects on the overlying strata, the maximum vertical and horizontal displacement values of overlying strata were 0.68 m and 0.062 m. After the fracture, the vertical and horizontal displacements suddenly increased to 3.06 m and 0.105 m, with an increase of 350% and 69.4%, respectively, and the higher the occurrence of TMR, the smaller the settlement of the overlying strata, but the wider the settlement span, the smaller the corresponding deformation value of the basin edge (the more difficult the surface to crack). These results are of tremendous importance for the control of rock strata and the revealing of surface deformation mechanism under TMR mining conditions in mines.
 
Key Words
    coal mining; thick magmatic rock; overburden movement; fracture; numerical simulation
 
Address
Yanchao Xue: Center for Rock Instability and Seismicity Research, Northeastern University, Shenyang, 110819, China

Quansen Wu: 1.) Department of Chemistry and Chemical Engineering, Jining University, Qufu 273100, China
2.) Engineering Laboratory of Deep Mine Rockburst Disaster Assessment, Shandong Province, Jinan 250000, China

Dequan Sun: 1.) Engineering Laboratory of Deep Mine Rockburst Disaster Assessment, Shandong Province, Jinan 250000, China
2.) Shandong Province Research Institute of Coal Geology Planning and Exploration, Jinan 250000, China
 

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