compute_soil_nailed_slope

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Paid tier only. Calling this without an authenticated CivilQuants account returns TIER_INSUFFICIENT — sign up at https://civilquants.com/pricing or use the free-tier alternative compute_cantilever_wall. Cut slope stabilised by passively-stressed soil nails with an applied face system. Discriminates between four face systems via the face_system enum: SHOTCRETE_MESH (dominant UK highway-cutting choice per SHW Cl. 644), HARD_FACING_PANEL (premium permanent works), FLEXIBLE_MESH (weathered rock drape), and VEGETATED_GEOGRID (landscape-sensitive schemes). Third member of the earth_structures L1 leaf (after gabion_wall S29 and reinforced_soil_wall S30). Eight variant presets cover all four face systems × representative slope geometries. Routes via three new WorkCategory entries (SOIL_NAIL, SHOTCRETE_FACE, FACE_MESH_REINFORCEMENT) plus reuse of EXCAVATION_GENERAL, DISPOSAL, CONCRETE_REINFORCED, GEOTEXTILE_FILTER, GEOGRID, and TOPSOIL_PLACE. Codes: CESMM4 C.5.X (soil nail) + E.8.10 (shotcrete) + G.5.8 (mesh), NRM2 7.7.X + 5.28.1 + 11.6.1, MMHW 600.20.X + 600.21.1 + 600.22.1 (SHW Cl. 638-639 / Cl. 644), SMM7 D32.3.X (steel piling — soil nails) + D41.6/D41.7 (the NAMED home for the three earth-structures families now). 23rd use of the classed-then-legacy attribute discrimination pattern; 4th use of the declared-then-banded pattern (nail_length_m bands the C.5.X / 7.7.X / 600.20.X / D32.3.X third digit). Example params: slope_height_m=8 m (0.5–25), slope_angle_deg=65 ° (10–89), slope_length_m=30 m (2–500). Example call: {"params": {"slope_height_m": 8, "slope_angle_deg": 65, "slope_length_m": 30}, "standard": "MMHW"}. Omitted parameters use sensible engineering defaults. Pass deliverables=["xlsx","dxf","pdf"] (any subset) to also receive one-shot download URLs in the same call: Excel BoQ (both tiers, watermarked free) plus the dimensioned DXF (CAD) and PDF drawing sheets (paid tier).