Continuous tunneling using a tunnel-boring machine is very popular method when it comes to the construction of large tunnel projects. The use precast reinforced concrete elements, called tubbings, highly economical way secure post excavation. Unfortunately, loss load-bearing capacity has been observed in past joints between tubbings. Reasons for that are among others required reduction cross se...

flow regime in dam's bottom outlet is divided in pressurized flow and free surface flow by the gate located for discharge control. down stream tunnel involves high velocity multi component air –water flow studied by mathematical model. in this research work, we used finite volume mixture two phase flow model. because of high reynolds number, standard two equations k-e turbulence model was ...

Tunnels have been the necessary element of modern construction industry. Due to their importance for infrastructural and economic point view, several tunneling projects are being carried out. The present numerical study investigates response rock tunnel under static surface blast loading. observed in three different types rocks predominantly Himalayan mountains, i.e. Phyllitic Quartzite, Quartz...

The aerodynamic force of vehicles has been affected by the geometric shape front surface. a scaled bus model and CD were experimentally determined in wind tunnel. experimental tests conducted at 6 different free flow velocities. They performed range 3.8×103- 7.9×103 Reynolds number. drawing data obtained 3D scanned drawn Solid Works program. circular cross section control rod was designed 10 mm...

In order to study the stress characteristics of initial support and secondary lining large section tunnel solve problem cracking during operation. Taking in Zihong village, Qi County as research object, a numerical simulation method was used establish finite element model tunnel. So simulate analyze structure this Through second terms displacement, stress, plastic zone damage anchor shaft force...

In this research, the behavior and characteristics of the wake of flow in an elliptic cylinder with zero angle of attack in the presence of a tripping wire were investigated experimentally. For this purpose, the used an Aluminum cylinder with an elliptical cross section of the major and minor axis of 42.4 mm and 21.2 mm, respectively, and of the height of 390 mm. The cylinder model was examined...

The aim of this study was to evaluate the tunnel enlargement phenomenon after ACL reconstructions performed with hamstrings tendons fixed using the cross pin technique. Sixty-two knees in 62 patients were followed for two years to evaluate the possible clinical implications of the femoral and tibial tunnel enlargements noted after ACL reconstruction. The reconstructions were done with hamstring...

This paper presents the design and validation of a measurement system for aerodynamic characteristics of unmanned aerial vehicles. An aerodynamic balance was designed in order to measure the lift, drag forces and pitching moment for different airfoils. During the design process, several aspects were analyzed in order to produce an efficient design, for instance the range of changes of the angle...