Sökning: "Measurement while drilling"
Visar resultat 1 - 5 av 10 avhandlingar innehållade orden Measurement while drilling.
1. Analysis of Excavation Damage, Rock Mass Characterisation and Rock Support Design using Drilling Monitoring
Sammanfattning : Prior to an underground excavation a site investigation is carried out. This includes reviewing and analysing existing data, field data collected through outcrop mapping, drill core logging and geophysical investigations. LÄS MER
Sammanfattning : The subject of this thesis is the utilisation of measurement while drilling to optimise blasting in large open pit mines. In Boliden´s open pit mine, Aitik drilling and blasting is a substantial part of the cost. An optimisation of drilling and blasting can therefor give large annual savings. LÄS MER
Sammanfattning : This research is carried out to better understand the nature of the rock mass and to have a better anticipation of rock fragmentation before blasting the rock mass. Current practices of assessing rock mass usually involve techniques that focus on the surface or outcrop of the rock mass such as scanline surveys, window surveys, photogrammetry and laser scanning etc. LÄS MER
4. Assessment of rock mass quality and its effects on charge ability using drill monitoring technique
Sammanfattning : For an efficient mining operation, it is essential to have as much information as possible aboutthe ore to be excavated and the rock masses surrounding the ore. Geological information andthe content and distribution of extractable minerals, are central concerns for long term mineplanning. LÄS MER
5. Anterior cruciate ligament reconstruction : Anatomic and biomechanical considerations of graft placement and fixation
Sammanfattning : This study, comprising 7 separate papers, is concerned with the mechanical causes of graft failure after intraarticular reconstruction of the anterior cruciate ligament (ACL). The study is predominantly experimental in design, but a clinical follow-up is also included to test a causal hypothesis of secondary graft elongation. LÄS MER