A method for determining the flatness ratio of shallow-buried long-span urban tunnels
A flat rate and tunnel technology, which is applied in the field of determining the flat rate of shallow-buried large-span urban tunnels, can solve problems such as many surrounding environmental constraints, poor geological conditions, and complex mechanical characteristics of structural forms
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[0059] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0060] The urban area of Beijing is located on the back of the alluvial alluvial fan of the Yongding River. The surface layer is alluvial deposits of the Quaternary Period, mainly consisting of sandy pebbles, sandy silt and cohesive soil in interlayer distribution, and the structure is relatively regular. Through the geological survey of the geological conditions of Beijing urban area, the stratigraphic sequence of the whole area mainly includes the artificial filling layer, the recent sedimentary layer, the upper layer of the Quaternary sedimentary layer, the lower layer of the Quaternary sedimentary layer, and the Tertiary sedimentary rock. In order to facilitate calculation and analysis without loss of generality, this paper generalizes stratigraphic distribution in urban areas of Beijing, as shown in figure 2 shown.
[0061] According to the geologica...
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