Determining and estimating method for surface subsidence characteristic parameters caused by subway tunnel construction

The present invention relates to a determining and estimating method for surface subsidence characteristic parameters caused by subway tunnel construction. The determining and estimating method comprises the following steps of: (1) determining related parameters for investigating, constructing and supporting a dug subway tunnel; (2) observing surface subsidence of the dug subway tunnel, and recording subsidence data; (3) calculating the surface subsidence characteristic parameters of the dug subway tunnel, including the width of a subsidence tank, the ground loss ratio, a width coefficient of the subsidence tank and an influence angle; (4) inputting data parameters and monitoring data of the dug subway tunnel and the fitted surface subsidence characteristic parameters in various conditions into a data table, and searching the relationships and the laws among the data; and (5) determining the related parameters for investigating, constructing and supporting a to-be-dug subway tunnel, searching parameters that are consistent with or generally similar to the existing parameters from the data table, estimating the surface subsidence characteristic parameters of the to-be-dug subway tunnel, drawing a surface subsidence tank curve by substituting a Peck formula through the estimated characteristic parameters, estimating the influence range, and regulating a construction scheme.