Experimental investigation on the breakage of hard rock by the PDC cutters with combined action modes
نویسندگان
چکیده
To verify the feasibility and efficiency of rotary-percussive drilling assisted by waterjets in very hard rocks, experiments on the Ž . performance of polycrystalline diamond compact PDC cutters resisting different combined loads of static thrust, impact, cutting and waterjets on Missouri red granite and Halston limestone were investigated. The experiments were conducted by means of a Ž . drop hammer and linear cutting-impact table. The effects of static thrust WOB , impact energy, impact spacing and waterjets on the rate of penetration in hard rocks are described and the results are analyzed by measuring the depth of the craters or cuts penetrated by PDC cutters. Results from the study confirmed that the combined mode of cutting-impact is very effective in very hard rocks. 2001 Elsevier Science Ltd. All rights reserved.
منابع مشابه
A Numerical Investigation of TBM Disc Cutter Life Prediction in Hard Rocks
There is a direct relationship between the efficiency of mechanized excavation in hard rocks and that of disc cutters. Disc cutter wear is an important effective factor involved in the functionality of tunnel boring machines. Replacement of disc cutters is a time-consuming and costly activity that can significantly reduce the TBM utilization and advance rate, and has a major effect on the total...
متن کاملInvestigation of phononic and thermal properties of InP by using pseudopotential method (Research Article)
In this paper, according to the density functional theory and semiharmonic approximation and solving kohen's equations using plane wave, band structure, phonon scattering; Dielectric tensor, Bourne effective charge, Raman cross-section; We calculated the infrared and specific heat capacity of indium phosphide in two-phase structures on zincblend (ZB) and salt rock (Rs). The results show that t...
متن کاملA state-of-the-art review of mechanical rock excavation technologies
The first step in mining activities is rock excavation in both mine development and production. Constant pressure for cost reduction and creating an improved/safe work environment for personnel has naturally resulted in increased use of mechanical excavation systems in many mining operations. Also, mechanical excavation and mining is more compatible with automation, meaning possibility of reduc...
متن کاملA New Concept for Selective Mechanical Mining of Hard Rock
Over the last several decades mechanical mining machines have developed into highly productive, light weight, mobile machines which are able to economically mine many soft rock ore bodies. Due to the utilization of disc cutters Tunnel Boring Machines, with great mass and limited mobility, have developed the ability to cut the hardest rocks at high production rates. Technological advancements ha...
متن کاملGeostatistical simulation of RQD variable using investigation of spatial continuity between Quaternary alluvial layer and hard rock of Gohar-Zamin mine to the determination of permeable zones
In this research, a sequential Gaussian simulation method has been used to determine the permeable zones in the hard-rock aquifer of the Gohr-Zamin open pit mine. For this purpose, 4946 RQD data from eighty-seven exploratory boreholes was used and exploratory-spatial data analysis of these data was performed using the preliminary statistics, location maps, histograms and variograms. Results of ...
متن کامل