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Title: First quarter report of electrical resistivity monitoring of the drift scale test

Abstract

No abstract prepared.

Authors:
Publication Date:
Research Org.:
LLNL (US)
Sponsoring Org.:
USDOE Office of Civilian Radioactive Waste Management, Washington, DC (US)
OSTI Identifier:
16734
Report Number(s):
UCRL-ID-131164
ON: DE98057904; TRN: US200222%%440
DOE Contract Number:
W-7405-Eng-48
Resource Type:
Technical Report
Resource Relation:
Other Information: Supercedes report DE98057904; PBD: 01 Jun 1998; PBD: 1 Jun 1998
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ELECTRIC CONDUCTIVITY; MONITORING; LAWRENCE LIVERMORE NATIONAL LABORATORY

Citation Formats

Ramirez, A., LLNL. First quarter report of electrical resistivity monitoring of the drift scale test. United States: N. p., 1998. Web. doi:10.2172/16734.
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Ramirez, A., LLNL. First quarter report of electrical resistivity monitoring of the drift scale test. United States. doi:10.2172/16734.
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Ramirez, A., LLNL. Mon . "First quarter report of electrical resistivity monitoring of the drift scale test". United States. doi:10.2172/16734. https://www.osti.gov/servlets/purl/16734.
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@article{osti_16734,
title = {First quarter report of electrical resistivity monitoring of the drift scale test},
author = {Ramirez, A., LLNL},
abstractNote = {No abstract prepared.},
doi = {10.2172/16734},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jun 01 00:00:00 EDT 1998},
month = {Mon Jun 01 00:00:00 EDT 1998}
}
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Technical Report:
View Technical Report (0.81 MB)
DOI:  10.2172/16734
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  • Of the several thermal, mechanical and hydrological measurements being used to monitor the rockmass response, electrical resistance tomography (ERT) is being used to monitor the movement of liquid water with a special interest in the movement of condensate out of the system. Eight boreholes, containing a total of 140 ERT electrodes, were drilled above and below the Heated Drift (HD) to form vertical planes parallel to the drift. In addition, 4 boreholes, containing 60 electrodes, drilled from the Access Observation Drift (AOD) form vertical planes at right angles to the HD. Four ERT surveys, three before and one after heatingmore » began, were conducted during the first quarter of FY 98. Tomographic images of absolute electrical resistivity have been calculated using these data and are presented in this report. The report also presents the coordinates of the electrodes used for the ERT surveys. Future reports will include images of electrical resistivity change calculated using data collected before and during the heating episode. The changes to be recovered will then be used in combination with temperature maps of the region to calculate maps of saturation change around the HD.« less

  • Of the several thermal, mechanical and hydrological measurements being used to monitor the rockmass response in the Single Heater Test, electrical resistance tomography (ERT) is being used to monitor the movement of liquid water with a special interest in the movement of condensate out of the system. Images of resistivity change were calculated using data collected before, during and after the heating episode. This report will concentrate on the results obtained after heating ceased; previous reports discuss the results obtained during the heating phase. The changes recovered show a region of increasing resistivity approximately centered around the heater as themore » rock mass cooled. The size of this region grows with time and the resistivity increases become stronger. The increases in resistivity are caused by both temperature and saturation changes. The Waxman Smits model has been used to calculate rock saturation after accounting for temperature effects. The saturation estimates suggest that during the heating phase, a region of drying forms around the heater. During the cooling phase, the dry region has remained relatively stable. Wetter rock regions which developed below the heater during the heating phase, are slowly becoming smaller in size during the cooling phase. The last set of images indicate that some rewetting of the dry zone may be occurring. The accuracy of the saturation estimates depends on several factors that are only partly understood.« less

  • No abstract prepared.

  • The Drift-Scale Test (DST) is one of the thermal tests being conducted in the Exploratory Studies Facility (ESF). One of the purposes of the DST is to study, at the ESF, the coupled thermal- mechanical- hydrologic-chemical (TMHC) processes at the repository horizon of the potential high-level nuclear waste repository at Yucca Mountain, Nevada. The objectives, the test design, and the test layouts of the DST are included in the test design report by the Civilian Radioactive Waste Management System Management and Operation (CRWMS M&O) contractors. The configuration of the DST includes a declining observation drift driven mostly east and downwardmore » from main tunnel in the ESF at approximately 2.827 km from the north portal. The downward slope of the observation drift (11.5% to 14.0%) ensures a minimum of 10 m of middle nonlithophysal Topopah Spring tuff as the overburden for the DST. The length of the observation drift is approximately 136 m. At the elevation of the DST crown (nominally 10 m below the upper extent of the middle nonlithophysal Topopah Spring tuff), the connecting drift breaks out to the north from the observation drift 136 m from the main tunnel of the ESF. The connecting drift extends approximately 40 m to the north from the observation drift. A heater drift breaks out westward from the connecting drift at approximately 30 m from the observation drift. The heater drift consists of an 11-m-long entry, which includes a plate-loading niche, and a 47-m-long heated drift. The nominal diameter of the drifts is 5 m. The detail configuration of the DST, including diagrams showing the drift and borehole layout, is included in the test design report by CRWMS M&O contractors.« less

  • The chemistry boreholes of the Drift Scale Test (DST) have been designed to gather geochemical information and assess the impact of thermal perturbations on gas and liquid phases present in pore spaces and fractures within the rock. There are a total of ten boreholes dedicated to these chemical studies. Two arrays of five boreholes each were drilled from the access/observation drift (AOD) in planes which run normal to the heater drift and which are located approximately 15 and 45% of the way along the length of the drift as measured from the bulkhead. The boreholes each have a length ofmore » about 40 meters and have been drilled at low angles directed just above or just below the heater plane. In each array, three boreholes are directed at increasingly steeper angles (< 25-) above the line of wing heaters and two are directed at shallow angles below the wing heater plane.« less