Document Details

Document Type : Article In Journal 
Document Title :
ROD Range and the Threshold Value
مجال معلم جودة صخور وقيمة المرجع
 
Subject : Earth Sciences 
Document Language : English 
Abstract : The RQD is the easiest method of calculating the desingation of the rock masses for design purposes. The threshold value of lOOmm is used so far to calculate RQD, with no scientific or physical basis for choosing this value. If the RQD calculation is based on this value it could give an ambiguous evaluation of the actual RQD of the rock mass in concern, and different threshold values could lead to different RQD's. In this paper, various threshold values were chosen from lOrnm to lOOmm to calculate the effect of RQD using a written computer program utilizing Monte Carlo method. The criterion used in the assessment of threshold value is its change with the RQD range which is defined as the difference between maximum and minimum RQD values that occur during a simulation of RQD by Monte Carlo technique. The result appears as an inverse parabolic relationship between RQD range difference and the threshold value. This research recommends use of a threshold value between lOmm to 4Ornm to calculate the actual RQD of the rock mass which lead to a minimum expected error 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 5 
Issue Number : 1 
Publishing Year : 1412 AH
1992 AD 
Number Of Pages : 13 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
بهاءالدين هاشم صدقة BAHAA-ELDIN H. SADAGAHResearcher  

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