#$%^&*AU2019203193A120200116.pdf#####Abstract for 2019203193 A method for calculating a minimum supporting force of a shield tunnelling surface in a sandy cobble stratum, comprising the steps of: a. establishing a three-dimensional mechanical model according to the shape of a shield tunnelling surface in slump; b. making basic assumptions according to the actual stratum condition and calculation needs; c. conducting force analysis on the three-dimensional mechanical model under an active limit state according to the basic assumptions, and establishing a balance equation; d. solving other unknowns in the balance equation, and determining an ultimate supporting pressure; and e. dividing the ultimate supporting pressure by a tunnelling area to obtain a minimum supporting force of the shield tunnelling surface. Created by Examiner 16/5/2019 Page 1
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