The invention discloses a stable support
analysis method for a tunnel face of a shield tunnel in a composite stratum, which relates to the technical field of support analysis, and comprises the following steps of: dividing the tunnel face and a front area thereof, classifying the areas with similar deformation tendency or
instability tendency into the same kind, and setting differentiated support control targets for each area, the method comprises the following steps: constructing a balanced scheduling framework of support and settlement, extracting related
risk characteristics before entering a risk working condition, inputting the related
risk characteristics into a safety evaluation model, performing preventive correction on a tunnel face pressure regulation amplitude, a propulsion
rate change slope and a grouting strategy according to an
evaluation result, and in the whole analysis and control process, performing safety evaluation on the tunnel face pressure regulation amplitude and the propulsion
rate change slope. And performing cross check by using a numerical method of different dimensions and field measurement, feeding back to the equilibrium scheduling framework when a difference is found, and re-correcting a support strategy. According to the
analysis method, a scheduling framework is constructed through real-
time data and partition classification, safety evaluation and cross checking are combined, the defects of composite stratum analysis are overcome, and the stability of the tunnel face and the construction safety are improved.