United States Department of Transportation
i
IH-35 – Ben White Boulevard to Williamson Creek Drainage Tunnel: Report Regarding the Concept Development
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1995-11-01
[PDF-2.74 MB]
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Edition:Final Report
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Abstract:This document summarizes the construction and design concepts developed to support the layout and subsurface geotechnical characterization associated with a system of water transport structures planned to provide for drainage of the new 1-35 and Ben White Interchange. The drainage system will consist of a set of vertical drop shafts, in soils and bedrock, and a conduit sited in the Austin Chalk (AC) bedrock. It will convey runoff from the interchange south to Williamson Creek. The main tunnel structure is sited in the AC below the interface between weathered rock and fresh rock. Experience has shown the AC to present relatively good tunneling conditions and, at the depths of the alignment, relatively low rock loading is anticipated on the peripheral rock mass and structural linings. Clay-rich layers, faulting, and deep weathered zones may locally require some special treatment to support the rock mass and to mitigate the impact of any local water inflows. Because AC has previously proven highly amenable to excavation by mechanical means, both Tunnel Boring Machine (TBM) and roadheader mining methods will be considered in the development of the structural designs under an adequate amount of unweathered rock cover. At the southern end of the alignment, where rock cover is inadequate, cut and cover construction techniques will be used. Auger drilling, which has also been used to good effect in this material, is assumed in the excavation of drop shafts, as envisaged to convey surface runoff water to tunnel level.
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