Research on Through Degree of Overlying Strata Fracture Fissure Induced by Mining
HUANG Bing-xiang
LIU Chang-you
XU Jia-lin
Abstract：Simulation and mechanical analysis were used to study the distribution of water con-ducting fissures induced in overlying strata by mining.The concept of degrees of fracture-fis-sure is presented.The results show thin strata completely fracture but hard,thick strata frac-ture incompletely.Incompletely fractured strata are not capable of vertically passing water or gas.Different stiffness and thickness of the upper strata affect the deformation in the fracture zone.The degree of fracture-fissure increases as the free space in the fracture zone increases.There is a gradual increase that tends to one as the free space exceeds some threshold value. As the strata thickness increases the open angle of the starting fracture-fissure decreases.The de-gree of fracture-fissure is linearly reduced along the crack tip at the critical opening displace-ment.It is also approximately linearly decreasing with an increase in the periodic fracture dis-tance in the strata.
Keywords：overlying stratawater conducted fissurethrough degreesimulation experimentbend
Publication Date：2010-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 45-49 )