Thermal properties (diffusivity and heat capacity) at varying temperatures up to 200°C and the thermal diffusivity under hydrostatic pressures up to 1 GPa at room temperature were measured on two basaltic samples recovered from Hole 504B drilled during Ocean Drilling Program Leg 148. Rock fabrics and porosity are key factors controlling the thermal properties of these rock samples. Estimates of...

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 numerica...

Calculation of the specific charge and specific drilling before a blasting operation plays a significant role in the design of a blasting pattern and the reduction of the final extraction cost of minerals. In this work, the information from the Sungun, Miduk and Chah-Firouzeh copper mines in Iran was assessed, and it was found that there was a significant relationship between the specific charg...

A dynamic numerical method is established to simulate the stability of surrounding rocks retained roadway in FLAC3D, along with a double-yield constitutive model re-compaction process gangue and strain-softening characteristic coal grouted fragmented after yielding. The simulation reveals that grouting slurry diffusion range, mining affecting stage behind working face rib deformation are closel...

In this work, the effect of rock bolt angle on the shear behavior of Rock Bridges is investigated using the particle flow code in two dimensions (PFC2D) for three different Rock Bridge lengths. Firstly, the calibration of PF2D is performed to reproduce the gypsum sample. Then the numerical models with the dimensions of 100 mm * 100 mm are prepared. The Rock Bridge is created in the middle of th...

Rock abrasivity is an essential factor for selecting cutting tools, estimating tool wear and life, and ultimately, matching various mechanized excavation systems with a given geologic condition. It also assists engineers to determine economic limits of different cutting tools and machines used in civil and mining projects. The Cerchar abrasion test is a simple and most widely used method for ro...

High birefringence induced by elliptical air hole photonic crystal fibers (EHPCFs) is analyzed numerically using the finite-element method. Statistical correlations between the birefringence and the various parameters are obtained. We found that the complex elliptical air hole is better than that of a circular one to obtain high birefringence in photonic crystal fibers. Our suggested structures...