The Himalayan region has enormous potential for hydropower development. However, variations in geological and geotechnical conditions pose challenging tasks the designers. If these are not tackled a timely manner during underground excavations, especially caverns, instabilities may occur, resulting time cost over-runs. For sustainable development, minimizing over-runs is necessary. modulus of d...

We investigated pressure-dependent changes in the optical properties of PbS nanocrystal quantum dots (NQD) by combining X-ray scattering and optical absorption spectroscopy in a diamond anvil cell. We discovered that the excitonic absorption peak vanishes as the NQD crystal structure reversibly undergoes the pressure-induced phase transition from rock-salt to orthorhombic structure. In the rock...

In this paper, we study the elastic properties (i.e. Bulk modulus B) of a series of early transition metal mono-nitrides and carbides crystallize in the NaCl-type face centered cubic (FCC) structure has been investigated using plasma oscillation theory of solids. The same approach has previously been applied to rock-salt structured rare-earth mono-chalcogenides [J. Alloys and Compd. 537 (2012) ...

The mechanical properties of any substance are essential facts to understand its behaviour and make the maximum use of the particular substance. Rocks are indeed an important substance, as they are of significant use in the energy industry, specifically for fossil fuels and geothermal energy. Attenuation of seismic waves is a non-destructive technique to investigate mechanical properties of res...

the testing equipment and the methods of field tests used for calculating the modulus of deformation and elasticity of the shah _ abass dam foundation rock are described here. the communication includes conclusions of which a sharp difference between the quality of the roc kin the right and in the left bank is the most important.

The explosion process of explosives in a borehole applies a very high pressure on its surrounding rock media. This process can initiate and propagate rock fractures, and finally, may result in the rock fragmentation. Rock fragmentation is mainly caused by the propagation of inherent pre-existing fractures of the rock mass and also from the extension of the newly formed cracks within the intact ...

This research work presents a case study of rock mass characterization on diversion tunnels at Diamer Basha Dam, Pakistan. Geological and geotechnical studies were performed to characterize the rock mass along the axis of diversion tunnel. The core specimens retrieved were tested in laboratory and physical and mechanical properties of the rock mass were determined. Detailed discontinuity survey...

Joints exist widely in tunnel engineering. Studying the deformation characteristics of bolted joint is beneficial for preventing rock mass disasters. To reveal joints, elastic solutions radial joints under compression-shear load were derived, which based on Lame solution mechanics and displacement coordination condition interface between bolt (assuming that at equal). Then, distance from any po...