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One wall approach (references (Thimble Shoals (Interior wall for WA only),…
One wall approach
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segmental shafts
caisson sinking
vertical excavated face difficult to achieve, or base stability is of concern due to water pressure
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BART
Design Criteria
Min Shear reinforcement
BART SDC, Section 6.4.1 E
Waterproofing
Section 5, “Waterproofing of Underground Structures”
leakage through non-waterproofed. Max 0.2gals per minute per 250' single track line, or 10000sf of continuous interior surface
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