Abstract One of the crucial factors that has gained widespread popularity during tunnelling construction process is face stability tunnel mainly depends upon support pressure to be applied at against overburden and surcharge loading acting on earth surface. In this study, different cross sections tunnels been investigated in cohesionless soil (loose medium dense sand) using Finite Element Analy...

The paper presents the parallel implementation of a multibody formulation for the analysis of the dynamic stability of a soft-in-plane tiltrotor configuration, with regard to the groundand airresonance phenomena. A multibody model of a tiltrotor semispan wind tunnel model has been used to investigate the phenomenon. An original multibody, multidisciplinary formulation has been used; its impleme...

Analysis of published data on the thirdand fourth-order moments of vertical velocity in the atmospheric boundary layer is performed, and it is shown that turbulence is non-Gaussian even when almost symmetric. It is also proposed that the relationship between thirdand fourth-order moments depends on stability. New data from a wind tunnel experiment roughly support this hypothesis. The analysis p...

SuMbiARY Flzght tests have been made to measure the static and dynamc longltudmal stability, the effect of ground on stabIll@, and the elevator pcwer of the Avro 7078 whxh has a delta wmg sweptback I$+.5c. A comparison of the results with those of tunnel tests IS made. There IS a loss of static atabIlIty, stxk fzed and free, above a lzft coefficwnt of 0.5. Stmk force/g at low speed is small par...

The safety factor of rock mass surrounding tunnel can be determined using the strength reduction method (SRM), furthermore, it is very important to solve criterion critical state. For stability estimation tunnel, there need discuss that preferable use same criteria for slope stability, such as non-convergence finite element calculation, penetration plastic strain and sudden change horizontal di...

PURPOSE The purpose of this study was to objectively evaluate the anatomic and biomechanical outcomes of anterior cruciate ligament (ACL) reconstruction with transtibial versus anteromedial portal drilling of the femoral tunnel. METHODS Ten human cadaveric knees (5 matched pairs) without ligament injury or pre-existing arthritis underwent ACL reconstruction by either a transtibial or anterome...

BACKGROUND Posterior Cruciate Ligament (PCL) ruptures are common sports injuries. One of the key controversies in PCL reconstruction is whether double-bundle reconstruction provides biomechanical and clinical outcomes superior to single-bundle reconstruction. METHODS We performed a comprehensive search in multiple databases to evaluate the advantages of single-bundle or double bundle reconstr...

nowadays deep excavations are needed for construction of foundation of high rise buildings, providing space for parking and etc. in some cases deep excavations may be constructed in the vicinity of the subway tunnels and causes unpredicted extra displacements and internal forces in tunnel lining of tunnels which were not designed for them and consequently affect serviceability of tunnel. theref...

the construction of underground tunnel plays a more and more important role in the development of big cities. one of the most important problems caused by the construction of the tunnel is that underground excavation will cause large settlement of the ground and buildings. previous studied showed the difference between numerical and experimental results. in this study the case study of niyayesh...