This paper deals with full face excavation of large size tunnels in rock masses of very poor quality which exhibit squeezing problems. Three different time dependent constitutive models of increasing complexity (a viscoelasticplastic model, an elastic-viscoplastic model, and an elastic-plastic-viscoplastic model) are used to analyze the tunnel response during excavation of the Saint Martin La P...

Background and objectives : To evaluate the efficacy of chemo-mechanical method (carisolv) of caries removal with that of hand cutting and rotary cutting instruments with the help of knoop hardness measurements of the cavity floor. Method : The 45 carious molars were subjected to caries detector (Kavo DIAGNOdent) to assess the extent of the lesion before and after the study. The selected sample...

During the excavation of a gallery in 2003 in the Tournemire argillite, a mine-by-test experiment has been performed, enabling measurements of pore pressure and displacements during the excavation (short term) as well as nearly three years after (long term). From these data, it has been possible, by means of bidimensionnal simulations, first to calibrate hydro-mechanical parameters, and then, u...

Lunar and planetary subsurface exploration is of considerable significance. The authors have studied the strategies for subsurface excavation and propulsion for the development of a lunar subsurface explorer. The authors have proposed an autonomous robotic explorer which can burrow into the soils. Based on the strategies the authors have already considered, this paper especially focuses on the ...

In studying the dynamics of ant nest excavation, the nest volume has to be continuously monitored. In many laboratory studies, the excavated substrate, such as sand, was collected, and the volume of excavation was calculated by converting the weight of the collected sand into the volume. The excavated sand can be manually collected and weighed; however, manual collection is tedious, particularl...

Excavation and earthmoving equipment mostly operate in accident-prone areas. These areas normally have rollover, confinement, and fall or may be considered harmful work areas due to demolitions and sewage removals. It is inevitable that excavation and earthmoving systems should be developed to secure the safety of operators through unmanned and remote control systems. Therefore, this research p...

Any archaeological site shows a stratification formed by single 3D volumes, the deposits and specific 3D surfaces of human origin as pits, ditches or wall-surfaces known as the units of stratification. Excavation forms the main data retrieval process in field archaeology a destructive process to be documented in three dimensions. To fully reconstruct the part of the site destroyed by excavation...

Research on data quality through the analysis of accuracy and uncertainty has become a major development in GIS science. Fisher’s taxonomy provides solutions for the processing of uncertainty in spatial data representation. However, excavation data differs from geographical data, owing to the specific features of archeology such as incompleteness, temporal and functional aspects. Therefore, arc...

Dimensionless coefficient () in convergence confinement method shows the relaxation of stress in the wall of the tunnel at different excavation movements. This factor is considered a constant number in previous studies and tunnel geometric characteristics (such as depth, cross-section shape, radius, soil material, etc.) are not included in its determination; however, ignoring these effects can...