Development and application for new solid-fluid coupling similar material of deep floor aquifuge

In order to deeply research the fracture law of floor aquifuge above confined water under deep mining, the new solid-fluid coupling similar material of deep aquifuge was chosen, containing paraffin and vaseline as cementing agent, river sand and calcium carbonate as aggregate, hydraulic oil as regulator based on plenty of similar material and test results. The ratio of each material in components was determined through a series of index testings, meeting the similar demand for solid-fluid coupling material;the similar material has the excellent brittleness and non-hydrophilicity characteristics after being soaked 3 days, and it could simulate floor aquifuge with different permeability. Applying the similar simulation test system with high water pressure, the change features of stress and displacement in deep floor aquifuge were analyzed, inversely gaining the crack evolution law of floor aquifuge under mining influence. The test results indicated that: (1) The mining cracks mainly appeared in the floor aquifuge below the open-off cut, middle of goaf and working face; (2) The majority of mining cracks were vertical tensile cracks, shear cracks and layer cracks; (3) The bigger of stress difference both sides of open-off cut, the fuller development of aquifuge cracks;the region between working face and fault was easy to occur floor water inrush, which presented the developed new similar material of aquifuge could be applied to study the fracture law of aquifuge, realizing the similar simulation of deep floor aquifuge. ©, 2015, Academia Sinica. All right reserved.