A closed-form analytical solution to rheological phenomena is obtained based on Hoek-Brown (HB) yield criterion and the generalized Bingham model. Once circular tunnel excavated, an initial plastic region formed. When total stresses fulfil condition, steps into viscoplastic region, in which displacement develops with time. The one-dimensional constitutive equation of model transformed a three-d...

The proposal of the NATM has changed people’s understanding support principle. Therefore, how to improve self-supporting capacity surrounding rock become an important issue in research. Bolts and lining are widely used together various projects because their bearing reinforcement effects line with concept NATM. This paper puts forward a model analyze mechanical behavior deeply buried circular t...

Abstract Sustainability in construction of tunnel is very important to reduce environmental impact and also minimal use earth resources. Therefore, numerical modelling proposing at design stage achieved this objective. To evaluate the changes soil settlements during excavation, empirical, analytical, methods have been frequently applied movement research method effective anticipating possible u...

In this paper a measurement of static pressure in the wake behind circular cylinder for different Reynolds numbers is presented. For purpose, probe with built-in transducer was used. The main goal to describe unsteady field and determine frequency generated Von Kármán vortex street. conducted low speed wind tunnel 110 mm diameter. results were compared an RANS simulation.

Essential to the emergence of spin-based electronics is a source of highly polarized electron spins. Conventional ferromagnets have at best a spin polarization P~50%. Europium monoxide is a novel material capable of generating a highly spin-polarized current when used as a tunnel barrier. EuO is both a Heisenberg ferromagnet (Tc=69 K) and a semiconductor. Exchange splitting of the conduction ba...

The objective of this research is to evaluate the stability natural slopes at inlet and outlet portals Bolangu Ulu diversion tunnel, Gorontalo. were considered stable, therefore slope analyses not carried out previously in tunnel portal design. using Circular Failure Chart (CFC) Limit Equilibrium Methods (LEM). Input data for obtained from field mapping laboratory testing soil rock samples. res...