In this paper, a fractal model for capillary flow through a single tortuous capillary with roughened surfaces in fibrous porous media is derived. The determined imbibition height and imbibition mas...

A fractal model for capillary flow through a single tortuous capillary with roughened surfaces in fibrous porous media

In this paper, the Fractal-Monte Carlo has been employed to simulate the effective thermal conductivity of porous media with roughened surfaces. The proposed probability model for the effective the...

Effective thermal conductivity of porous media with roughened surfaces by fractal-monte carlo simulations

Dynamic disasters, such as rock burst due to the breaking of large area stiff roof strata, are known to occur in the hard rock strata of coal mines. In this paper, mechanical models of the fracturing processes of thick hard rock strata were established based on the thick plate theory and numerical simulations. The results demonstrated that, based on the fracture characteristics of the thick hard rock strata, four fracture models could be analyzed in detail, and the corresponding theoretical failure criteria were determined in detail. In addition, the influence of weak interlayer position on the fracture models and ground pressure of rock strata is deeply analyzed, and six numerical simulation schemes have been implemented. The results showed that the working face pressure caused by the independent movement of the lower layer is relatively low. The different fracture type of the thick hard rock strata had different demands on the working resistance of the hydraulic powered supports. The working resistance of the hydraulic powered supports required by the stratified movements was lower than that of the non-stratified movements. 

Investigation on fracture models and ground pressure distribution of thick hard rock strata including weak interlayer

The effective thermal conductivity of unsaturated porous media is of interest in a number of applications of heat transfer. In this paper, a novel fractal solution for effective thermal conductivit...

An investigation on effective thermal conductivity of unsaturated fractal porous media with roughened surfaces

Stability analysis of roadside backfill body at gob-side entry retaining under combined static and dynamic loading

The Taiyuan group is one of the coal-bearing formations in Shanxi Province, in which coal resource is extremely abundant. No.15 coal seam is the main minable coal seam in Taiyuan group, and it develops with thick-hard limestone roof which is a threat to safe and efficient mining because of the roof failure. Aiming at the geological setting of No.15 coal seam and its surrounding rock, we conduct an experimental study on physical and mechanical properties of No.15 coal seam and its floor as well as roof, and we also have an underground measurement on roof fracture width and floor loose range of headgate. Based on experimental results and fracture mechanics theory, we established a thick-hard limestone roof cracking model and discussed the factors that affect roof fracture initiation and extension. The research results demonstrate that roof fracture height is affected by the horizontal stress, surrounding rock deformation, roof mechanical strength and roof span. The deformation of wall and floor will induce the roof fracture extension. The roof fracture extension is high in stress concentration area under the upper coal face residual coal pillar. The fracture height can be effectively controlled by reducing surrounding rock loose range and improving mechanical strength of walls.

Study on the fracture characteristics of thick-hard limestone roof and its controlling technique

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Study on the fracture characteristics of thick-hard limestone roof and its controlling technique