Sentence examples for loosening zone from inspiring English sources
The extent of the loosening zone in tunnels excavated through columnar jointed basalts is studied with the numerical discontinuous deformation analysis (DDA) method.
Through the case studies, the chapter demonstrates that for tunnels with cracked linings, the pseudoshell model and the quasi loosening zone model can work together to provide an effective means for calculating the ground pressure based on the CMOD.
Results of displacement monitoring performed during tunnel excavation in a similar rock mass with multiple point borehole extensometers confirm the numerically obtained depth of the loosening zone both in the sidewalls and the roof.
We find that the height of the loosening zone in the roof as obtained with DDA is greater than would have been predicted by Terzaghi's empirical rock load classification for "blocky" rock masses, and show that its shape and orientation are controlled by the anisotropy of the rock mass structure.
As an application of the EFCM, a pseudoshell model for crack analysis of the tunnel lining is introduced in this chapter, which enables the crack-mouth-opening displacements (CMODs) of individual cracks to be calculated, corresponding deformations of the lining to be obtained, and pressure loads to be determined by a quasi loosening zone model.
This paper describes an evaluation of loosened zones based on monitored stress of rock and an application of prediction analysis for observational construction techniques.
There was revision of three knees (three patients), two of them for aseptic loosening in zone one of tibial component with tibial subsidence and one for instability in non-HF group and all patients were at follow up of 5 years or above when loosening was identified.
Eighteen sectors, ranging from finance to shipping, will have regulations loosened in the zone.
Furthermore X-ray examinations sometimes can be a supportive option when considering aseptic loosening (clearing up zones) of the implant.
The results show that the zone of loosened rock mass extended much deeper into the rock mass than it did at other sites in the region because of the tectonic history of the site and cutting.
Furthermore, if a delay in placing support allows the zone of rock loosening to propagate upward (i.e., rock falls from the tunnel roof), the rock-mass strength is reduced, and the ground arch is raised.
