An Approximate Prediction of Metro Pit’s Sub-Step Excavation
To combine the characters of metro pits and time-space effect, an approximate prediction method is studied. Sub-step excavation width, depth, unsupported exposure time and space effect are the main reasons for the displacement of excavation. To calculate the comparative displacement ratios of different parameters variational conditions and standard excavation condition, the displacement effective modulus of every parameter are obtained, and the differences of every layer excavation are also considered. The displacement of excavation can be predicted when the excavation parameters changed based on this method, and the displacement can be controlled by modulating the excavation parameters.
W. Wang and H. S. Liu, "An Approximate Prediction of Metro Pit’s Sub-Step Excavation", Applied Mechanics and Materials, Vols. 90-93, pp. 1926-1930, 2011