Experimental Study on Mechanical Properties and Energy Evolution Law of Coal-Rock Composite Structure under Different Interface Connection Modes

The stability of the coal-rock composite structure is great significance to safety production deep mines, and different interface connection modes coal rock have an important influence on its stability. Therefore, following work was done in this article: Firstly, mechanical model established, analyzed. Secondly, characteristics (plastic zone, stress, displacement) under were studied by numerical simulation, energy quantitatively analyzed FISH language FLAC3D. results as follows: (1) reduces strength increases structure. (2) In loading process, body destroyed first destruction range gradually with increase stress. failure mode mainly a plastic shear failure, deformation much larger than that (3) contact affects behavior strong influences strength, displacement, accumulation structure, among which displacement greater, helpful improvement strength. it suggested adopt study