The response of a massif to stresses generated by tunnel excavation depends essentially on the geological conditions, geometry and its underground position. major problem related construction these structures is ensure stability whole tunnel-ground, controlling various deformation during construction. In this context, present paper examines effect conditions behavior tunnels surrounding soil. s...

This paper describes the design, construction and early performance of a retaining structure close to a subway tunnel in Barcelona. The excavation, about 16 m deep, was carried out in 2001 during the construction of a new hospital, and involved a rectangular area with the longer side (170 m) almost parallel to the tunnel. The design had to fulfil two requirements: first, the influence of the ex...


 In recent years, experimental and numerical researches on the effect of blasting pressure stability existing tunnels was widely obtained. However, during excavation a new tunnel or expansion old an has disadvantages still unclear. Some were carried out to study relationship observed Peak Particle Velocity (PPV) lining areas along direction, due either lack in situ test data difficulty co...

BACKGROUND The purpose of this study was to compare the clinical and radiological results of 2 different tibial fixations performed using bioabsorbable screws with added hydroxyapatite (HA) and pure poly-L-lactic acid (PLLA) screws in anterior cruciate ligament (ACL) reconstruction. METHODS A total of 394 patients who underwent arthroscopic ACL reconstruction between March 2009 and June 2012 ...

We have studied the voltage fluctuations of current-biased, micron-scale magnetic tunnel junctions. We find that the spectral power density is 1/f -like at low frequencies and becomes frequency independent at high frequencies. The frequency-independent background noise is due to Johnson-Nyquist noise and shot noise mechanisms. The nature of the 1/f noise has its origin in two different mechanis...

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PURPOSE To investigate tibial tunnel widening and knee instability after ACL reconstruction with hamstring autograft or irradiated soft tissue allograft. METHODS Eight-two patients were divided into two groups: autograft group and allograft group. Radiographic and clinical evaluations were performed. RESULTS Seventy patients were followed up with median of 36.3 months (range 36-38 months). ...

The influence of foundation pit excavation on deformation and stability the supporting structure underlying adjacent existing tunnel is a comprehensive geotechnical engineering problem, including unloading effect coupling surrounding rock structure. Using numerical calculation methods, this paper changes different depths widths discusses evolution law about force structure, changing relationshi...