ABSTRACT

ABSTRACT: Twenty Four kilometers of tunnel were driven as part of the construction for the Superconducting Super Collider Project, primarily through Austin Chalk. During the drive, local failures of ground were encountered. The factors controlling the failures have included high horizontal in situ stresses, a regional geologic structure with major faults trending NNE, the presence of minor faulting, the mineralogical composition of shaley layers in the chalk, strength variations in the chalk, ground water, tunnel shape and orientation, and the type of excavation equipment used. Each factor alone has generally not been sufficient to cause instabilities but in combination they have led to a number of mechanisms resulting in instabilities in the tunnel through the chalk.

Keywords:
Reservoir Characterization, shaley seam, shaley layer, excavation, construction, reservoir geomechanics, rock mechanics condition, failure surface, deterioration, moisture
Subjects:
Reservoir Characterization, Exploration, development, structural geology, Reservoir geomechanics
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1994. A.A. Balkema - Permission to Distribute - American Rock Mechanics Association
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