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Analysis and Calculation of the Space-time Impact on the Construction Method for Shallow Subsurface Excavation of a Certain Underground Passageway

MA Si-ming(The 2nd Engineering Co. Ltd. of the 13th Bureau Group of the Railway Building Corporation of China, Shenzhen518083, China )  
The forecast of displacement is very important in the construction of shallow subsurface excavation of underground passageway, but the calculation method of it is very complex under the effect of the space-time impact. With the construction of a certain underground passageway as a practical example, the causation, the characteristics and the laws of the space-time impact on the construction method for shallow subsurface excavation of underground passageways are discussed in the paper, with the calculation method for the pre-measurement displacement, the displacement before the excavated section arrives and the total value of the displacement presented to forecast displacement precisely.
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