Data and code for: Symmetry-adapted condensed impedance for the longitudinal response of twin tunnels

Frozen extracted data (85 CSV files), analysis scripts, and pre-registration freeze records supporting the manuscript "Symmetry-adapted condensed impedance for the longitudinal response of twin tunnels" (submitted to Computers and Geotechnics). The portable analysis layer rebuilds every table and figure of the paper from the frozen CSVs using plain Python (numpy, matplotlib); the Abaqus generation/extraction layer is included for audit. See README.md for layout, commands, field dictionary, role labels, and the SHA-256 manifest.