Earth Sciences annual report, 1987 Page: 6 of 80
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mechanical devices i, under ua . To monitor mois-
ture changes in sealing materials tie are working
w ith the Engineering Research Division of LLNL to
der elop a neu technique based on measuring changes
in nicro ave resonant frequencies. For determining
groundsater tracer selocis. ,e are collahorating
w ith the Encironmenial Science, Diision to des elop
fiber optic sensor systems that can he embedded in
the dealing materials. The'e s stens w ill eliminate
the need to retrieve ground ater samples, and there-
b, allow Co1hlnti ,u monitelrig.
GENASYS licotechnical Eninmeering Analpis
Ssstemi is a tuo- and threet-dmensonal h hrid
houndars -element Imtite-element cmde heg der el-
oped for this program. When completed. It a ill
compute the coupled delitrmatton and fluid-Ilows
response of fractured nonporous rock masses suhbjecl
to exca\ atnon. We are des eloping the t o- and
three-dimensional houndar% element part of the
code. An important aspect of ht, des elopnent attd
salidation s ill he its use in simulating the escas a-lion respolse esperiments that arc beii cotnducted
at the URL. In addition to and mn support ot this
code des elopment c ork. theoretical model, and es-
perimental metiods are being de eloped to impros e
our ahtlit% to predict the coupled respotse otf rac-
tured rock formations.
We hase used the first s ersiot of the GIENASYS
eule to predict the tresses and di'placements
induced bs the excar ation of Instrutent Roott 2l1
at the I.RI.. In this e perimtmut. s htih I a tral run
for the main escas aton respouSe e periment. the
response of the rock m.t to the e r\.tation of a tu-
nel aml a selquette of nineteen esera al ion ,teps a as
measured bk an arran of instruments that mIelude
Ioeihole etensotelers and stessteters. The eca-
\ation sequence I lIg. Ii consist' oit a 111u hole esca-
sated tt the I rst ten step,. then enlarged tt rme
addilional lash steps. The deformted 1os sections
at lte entd of exsca ating the pilot hole shoss n in
fig. 2 illu'trate the lack of s umetr tt the three-
dmensmmal deformaton of the rock mas.Elevation of excavation sequence
zA@ 12000000010
y
._
* 1 Extensometer EXT-06 anchors
" 3
" 4 " Stressmeter N1
e c @ @g 12 @ !4 @5 @6 171
@1 12@@@@@@@@6 7 1 1
xy
Plan of excavation sequence
Figure I. The nineteen elca atihm steps needed to construct Instrument Ronm 209 at the
Underground Research Laboratory i'Ri.. The pilot hole w as escar ated in the first ten steps. Ihen
enlarged in nine additional steps. The approsimale location op one estensonieler EXT-1181 and one
stressmeter uN I i are shot n.3
1987 E arlh .Science.s annual Report
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Younker, L. W.; Donohue, M. L. & Peterson, S. J. Earth Sciences annual report, 1987, report, December 1, 1988; [Livermore,] California. (https://digital.library.unt.edu/ark:/67531/metadc1113396/m1/6/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.