Document Details

Document Type : Article In Journal 
Document Title :
Volumetric Rock Quality Designation with Lognormally Distributed Intact Lengths
معلم جودة الصخور الحجمي مع مسافات الشقوق الموزعة لوغارتميا طبيعيا
 
Subject : Earth Sciences 
Document Language : English 
Abstract : Rock fragments due to different joint types are classified qualitatively into three categories as bars, plates and prisms. However in engineering evaluations their quantitative descriptions based on the field observations leading to reliable design values are of prime importance. Simple conceptual models of rock fragments coupled with the scanline measurements provide objective relationships between the rock quality designation (RQD), volumetric, ·areal of linear (along scanline) joint counts (J) and block volumes (V). The main purpose of this paper is to derive such relevant relationships for the logarithmically distributed intact lengths. Due to the complication of theserelationships the results are presented in the form of various charts which are hoped to provide useful tools for any engineering geologist. The presented charts are for standard deviation equal to unity, however, charts for any desired value of standard deviation can be prepared from the relevant equations. The implementation of the methodology is performed for actual field data. A significant conclusion is that the negative exponential distribution provides a single volumetric RQD value which is different than the directional RQD's. However, the log-normal distribution gives almost the result within the practical limits both for directional and volumetric RQD vaiues. This is a valid conclusion that the log-normal distribution represents the field data better than negative exponential. 
ISSN : 1012-8832 
Journal Name : Earth Sciences Journal 
Volume : 5 
Issue Number : 1 
Publishing Year : 1412 AH
1992 AD 
Number Of Pages : 24 
Article Type : Article 
Added Date : Sunday, October 11, 2009 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
زكاي شن ZEKAI SENResearcher  
السيد أ. عيسى ELSAYED A. EISSAResearcher  

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