Method for controlling stability of second-layer primary support arch feet of large-span structure in soft stratum arch cover method
The invention discloses a method for controlling the stability of a second-layer primary support arch foot of a large-span structure in a soft stratum arch cover method. The method comprises the steps that S1, pilot tunnel excavation is conducted on an arch foot part; s2, constructing a first-layer...
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Format: | Patent |
Sprache: | chi ; eng |
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