A support structure and method for forming same for use in excavations such as underpasses, tunnels and the like for roads, rail or rivers. The support structure allows the utilization of the strength provided by using arch shaped sections and also minimizes the disruption caused to the soil surrounding the excavation thereby allowing existing road, rail or river services to continue to be used during excavation.

 
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< Composition having low thermal resistivity and method for laying underground cables for carrying electrical energy

< Methods and apparatus for measuring electrical properties of a ground using an electrode configurable as a transmitter or receiver

> In situ thermal processing of a coal formation to produce nitrogen and/or sulfur containing formation fluids

> Precast modular intermodal concrete shapes and methods of installation to form shoreline stabilization, marine and terrestrial structures
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