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Scientific Publishing Center
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 Type
Dr Grade
Email
زكاي شن
ZEKAI SEN
Researcher
السيد أ. عيسى
ELSAYED A. EISSA
Researcher
Files
File Name
Type
Description
21574.pdf
pdf
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