an important concern in rock mechanics is non-homogeneity as joints or fault. adopting the joints as fractures, fractures are well known for their effects on the mechanical and transport properties of rock. it has been postulated that through fractured/jointed rock, mainly, the polygons turned to the shear vector (ti) are involved in the mobilization of shear resistance. consequently, in order ...

In order to study the local deformation of an anchor bolt and improvement in shear strength a structural surface under misalignment anchorage structure surface, FLAC3D software was used simulate granite, sandstone, coal specimens with angles 90° analyze damage anchoring agent changes axial forces bolts surface. The results show that near had significant characteristics surface; is, length area ...

Aims. Both the black hole mass and the X-ray luminosity of AGNs have been found to be anti-correlated with the normalized excess variance (σrms) of the X-ray light curves. We investigate which correlation with σ 2 rms is the intrinsic one. Methods. We divide a full sample of 33 AGNs (O’ Neill et al. 2005) into two sub-samples. The black hole masses of 17 objects in sub-sample 1 were determined ...

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Finite element technique is used to model two phases of tunneling process, namely; excavation and rocklining interaction. The excavation phase is responsible for determining the pre-lining rock mass deformations and the reduced in-situ stresses. The interaction phase models the compatibility of the rock-lining system. The deformations and stresses of the rock-lining system and the final rock ma...

We observe stable holes in a vertically oscillated 0.5 cm deep aqueous suspension of cornstarch. Holes appear only if a finite perturbation is applied to the layer for accelerations a above 10g. Holes are circular and approximately 0.5 cm wide, and can persist for more than 10(6) cycles. Above a approximately equal to 17g the rim of the hole becomes unstable, producing fingerlike protrusions or...