Mechanical rockcutting with and without high pressure water jets
Başlık çevirisi mevcut değil.
- Tez No: 158383
- Danışmanlar: PROF. MİCHAEL HOOD
- Tez Türü: Doktora
- Konular: Maden Mühendisliği ve Madencilik, Mining Engineering and Mining
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1984
- Dil: İngilizce
- Üniversite: Orta Doğu Teknik Üniversitesi
- Enstitü: Fen Bilimleri Enstitüsü
- Ana Bilim Dalı: Maden Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 184
Özet
Özet yok.
Özet (Çeviri)
ABSTRACT A hybrid rock cutting method using water jets to assist the mechanical tools vas investigated. Benefits of using a water jet assist system included: (i) substantial reduction in the bit forces; (ii) reduced rates of bit «ear; (iii) reduced dust production; and (iv) reduction in fractional heating. A series of dry and water jet assisted cutting experiments were conducted with a drag bit in Indiana Limestone. The relative influence of jet parameters in reducing the bit forces was investigated. The optimum performance of the water jet assist system was with a single jet parallel to and about 1 mm ahead of the leading face of the bit. Jet power was the most significant factor in reducing the bit forces. A threshold jet power level had to be exceeded to achieve optimum force reductions. If the jet power was increased beyond this threshold valueno further reduction in bit forces was observed. The influence of bit velocity on bit force reductions was not very significant. An increase in the bit velocity by a factor of four resulted in a six percent decrease* from 50 to 44 percent» ân the force reduction achieved with water jets. Potential benefits of the water jet assist approach to oil well drilling were demonstrated by preliminary experiments combining water jets with FDC bits. Indentation tests were conducted to study the crack growth and chip formation underneath the bit. A sieve analysis was carried out on rock fragments produced during dry and water jet assisted cutting. The surface area of fragments from these cuts was determined. Energetics of the fragmentation process producing these surfaces was studied by using a fracture mechanics approach. It was found that only 10 percent of the applied mechanical energy was used in producing the resulting surface. Based on a comparative review of results and possible mechanisms» an explanation of the mechanics of water jet assisted cutting was developed. The dominant mechanism was continuous removal of the broken rock that formed ahead of the advancing bit. Finally» a theoretical model was introduced for a better understanding of this mechanism.
Benzer Tezler
- Mini-disk keskili bomlu kazı makinelerinin stabilite analizi
Stability analysis of a mini-disc equipped boom type tunneling machine
CEMALETTİN ERDOĞAN
Yüksek Lisans
Türkçe
2015
Maden Mühendisliği ve Madencilikİstanbul Teknik ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
DOÇ. DR. ÖMÜR ACAROĞLU ERGÜN
- Kesici disklerin kayaç kesme performansının araştırılması ve performans tahminine yönelik modellerin geliştirilmesi
Investigation of rock cutting performance of disc cutters and development of models for performance prediction
GÖKHAN AYDIN
Doktora
Türkçe
2012
Maden Mühendisliği ve MadencilikKaradeniz Teknik ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
DOÇ. DR. KERİM AYDINER
- Field and laboratory studies on the performance prediction of raise boring machines
Başyukarı kuyu açma makinaların performans tahmini için saha ve laboratuvar çalışmaları
AYDIN SHATERPOUR MAMAGHANI
Yüksek Lisans
İngilizce
2015
Maden Mühendisliği ve Madencilikİstanbul Teknik ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
PROF. DR. NUH BİLGİN
- Numerical analyses of rock fracturing by various indenters
Çeşitli delici uçlarla yapılan kaya parçalanmasının sayısal analizi
NAZİFE TİRYAKİ
Yüksek Lisans
İngilizce
2008
Maden Mühendisliği ve MadencilikHacettepe ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
PROF. DR. BAHTİYAR ÜNVER
- Kalem uçlu keskilerle kayaç kesme mekanizmasının üç boyutlu sayısal modellenmesi
Three-dimensional numerical modelling of rock cutting mechnanism with conical bits
OKAN SU
Doktora
Türkçe
2010
Maden Mühendisliği ve MadencilikZonguldak Karaelmas ÜniversitesiMaden Mühendisliği Ana Bilim Dalı
PROF. DR. NURİ ALİ AKÇIN