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Study methods for the drillings around the underground nuclear explosions in the Sahara. Part 1. study of rock samples; Methodes d'etude des forages realises autour des explosions nucleaires souterraines au Sahara. Premiere partie: etude des echantillons de roche

Abstract

An examination of the mechanical effects produced on rocks by an underground nuclear explosion calls for the use of particular means of exploration which are described in this report, special attention being paid to the equipment used in connection with the French nuclear tests in the Sahara. The drilling methods used (rotary and turbo-drilling) are adapted to the particular conditions of the sampling programme, to the radioactivity and to the temperature in the region of the explosion. A study of the samples makes it possible to obtain the new characteristics of the rock and to assess the chemical and mechanical transformations which it has undergone. An examination of the core obtained from the drilling, together with a knowledge of the drilling parameters (depth of the probe, sample recovery, etc...), makes it possible to study the extent and the characteristics of the zones which have been damaged to different degrees according to their distance from the zero point: cavity, strongly powdered zone, fractured zone, chimney, zones containing high stresses leading to a particular type of fracture of the cores. The problems connected with the interpretation of the results are also presented. (author) [French] L'examen des effets mecaniques provoques par une explosion  More>>
Authors:
Derlich, S [1] 
  1. Commissariat a l'Energie Atomique, Bruyers-le-Chatel (France). Centre d'Etudes
Publication Date:
Jul 01, 1969
Product Type:
Technical Report
Report Number:
CEA-R-3762(pt.1)
Resource Relation:
Other Information: 5 refs; PBD: 1969
Subject:
58 GEOSCIENCES; CAVITIES; DRILL CORES; DRILLING EQUIPMENT; DRILLING FLUIDS; EXPLOSIVE FRACTURING; FRACTURES; GRANITES; RADIATION PROTECTION; RADIOACTIVE MATERIALS; REMOTE CONTROL; ROCK MECHANICS; ROTARY DRILLING; UNDERGROUND EXPLOSIONS
OSTI ID:
20528760
Research Organizations:
CEA Bruyeres-le-Chatel, 91 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
TRN: FR04R3762095026
Availability:
Available from INIS in electronic form
Submitting Site:
FRN
Size:
[15] pages
Announcement Date:

Citation Formats

Derlich, S. Study methods for the drillings around the underground nuclear explosions in the Sahara. Part 1. study of rock samples; Methodes d'etude des forages realises autour des explosions nucleaires souterraines au Sahara. Premiere partie: etude des echantillons de roche. France: N. p., 1969. Web.
Derlich, S. Study methods for the drillings around the underground nuclear explosions in the Sahara. Part 1. study of rock samples; Methodes d'etude des forages realises autour des explosions nucleaires souterraines au Sahara. Premiere partie: etude des echantillons de roche. France.
Derlich, S. 1969. "Study methods for the drillings around the underground nuclear explosions in the Sahara. Part 1. study of rock samples; Methodes d'etude des forages realises autour des explosions nucleaires souterraines au Sahara. Premiere partie: etude des echantillons de roche." France.
@misc{etde_20528760,
title = {Study methods for the drillings around the underground nuclear explosions in the Sahara. Part 1. study of rock samples; Methodes d'etude des forages realises autour des explosions nucleaires souterraines au Sahara. Premiere partie: etude des echantillons de roche}
author = {Derlich, S}
abstractNote = {An examination of the mechanical effects produced on rocks by an underground nuclear explosion calls for the use of particular means of exploration which are described in this report, special attention being paid to the equipment used in connection with the French nuclear tests in the Sahara. The drilling methods used (rotary and turbo-drilling) are adapted to the particular conditions of the sampling programme, to the radioactivity and to the temperature in the region of the explosion. A study of the samples makes it possible to obtain the new characteristics of the rock and to assess the chemical and mechanical transformations which it has undergone. An examination of the core obtained from the drilling, together with a knowledge of the drilling parameters (depth of the probe, sample recovery, etc...), makes it possible to study the extent and the characteristics of the zones which have been damaged to different degrees according to their distance from the zero point: cavity, strongly powdered zone, fractured zone, chimney, zones containing high stresses leading to a particular type of fracture of the cores. The problems connected with the interpretation of the results are also presented. (author) [French] L'examen des effets mecaniques provoques par une explosion nucleaire souterraine sur la roche necessite la mise en oeuvre de moyens d'exploration particuliers dont l'expose fait l'objet de ce rapport, essentiellement pour les moyens utilises autour des essais nucleaires francais au Sahara. Les methodes de forage (rotary et turboforage) sont adaptees aux conditions particulieres dues au programme d'echantillonnage, a la radioactivite et a la temperature regnant a proximite du point de tir. L'etude des echantillons permet la determination des nouveaux caracteres de la roche et de ses transformations chimique et mecanique. L'examen des carottes et l'utilisation des parametres de forage (cotes sondeurs, recuperation des echantillons, etc...) permettent d'etudier l'extension et les caracteristiques des zones ayant subi des degats differents suivant leur distance au point zero: cavite, zone intensement broyee, zone fracturee, cheminee, zone dans laquelle regnent des contraintes elevees provoquant une fracturation particuliere des carottes. Les problemes lies a l'interpretation des resultats ont ete egalement exposes. (auteur)}
place = {France}
year = {1969}
month = {Jul}
}