Investigation density, ground heterogeneity and the reliability of driven tension piles at solar-tracker sites — supporting data

Supporting data for a study of how the density of a CPT investigation and the heterogeneity of the ground shape the site-wide distribution of model-implied reliability for driven tension piles carrying ground-mounted solar trackers. The deposit covers two anonymised real sites (a homogeneous clay investigated by 15 CPTu and a heterogeneous granular site investigated by 40 CPTu), the same design-and-reliability workflow repeated on progressively thinned sub-networks of each, and a controlled synthetic experiment of 9,000 ground fields spanning three heterogeneity levels and three horizontal correlation lengths. Contents: per-pile design lengths and first-order reliability indices for every network; the Eurocode 7 Model Pile Method design files and the implementation audit; held-out reconstruction and profile-coverage diagnostics; the network-resampling bootstrap; the four-way simulator comparison; the synthetic-ensemble summaries; and the simulator acceptance records. README.txt documents every file and states the conventions: β is a one-year index under an annual-maximum wind model, β = 3.3 is a screening threshold rather than a compliance target, and below-threshold fractions are element-level descriptors, not system failure probabilities.