BS 8006-2:2011 — Soil nails (Sets 1 and 2)

Known limitations

• Pore pressure follows each slice's soil factor (Slope's water rule); Table 5 gives γu = 1.0.
• γSd = 1.0 is supported for Bishop's simplified method only (Table 5 note G); other methods also use 1.0, which is not calibrated or validated, and Slope says so beside the result.
• Bond factors are for a characteristic bond stress chosen empirically or calculated from soil properties (4.3): γτb 1.1 / 1.5. For bond from pull-out tests, duplicate Set 1 or Set 2 and enter the Table 6 value (4.3.6): Set 1 1.1–1.3 in coarse-grained soils, 1.5–1.7 in medium and high plasticity soils; Set 2 1.5–1.7 and 2.0–2.25. A copy runs its one set (check the other set with its own copy), and its γτb applies to every nail.
• γs = 1.15 is for steel tendons; other tendon materials need their own factor.
• Nail heads and facing (4.7) are not checked; the plate term is unfactored.
• Anchors, geosynthetic and steel layers and piles are outside BS 8006-2 and are unfactored.

Known limitations

• Pore pressure follows each slice's soil factor (Slope's water rule); Table 5 gives γu = 1.0.
• γSd = 1.0 is supported for Bishop's simplified method only (Table 5 note G); other methods also use 1.0, which is not calibrated or validated, and Slope says so beside the result.
• Bond factors are for a characteristic bond stress chosen empirically or calculated from soil properties (4.3): γτb 1.1 / 1.5. For bond from pull-out tests, duplicate Set 1 or Set 2 and enter the Table 6 value (4.3.6): Set 1 1.1–1.3 in coarse-grained soils, 1.5–1.7 in medium and high plasticity soils; Set 2 1.5–1.7 and 2.0–2.25. A copy runs its one set (check the other set with its own copy), and its γτb applies to every nail.
• γs = 1.15 is for steel tendons; other tendon materials need their own factor.
• Nail heads and facing (4.7) are not checked; the plate term is unfactored.
• Anchors, geosynthetic and steel layers and piles are outside BS 8006-2 and are unfactored.

Known limitations

• Geotechnical Category 3 (Table 5 note A): every non-unity factor of Table 5 is increased by 10 %.
• Pore pressure follows each slice's soil factor (Slope's water rule); Table 5 gives γu = 1.0.
• γSd = 1.0 is supported for Bishop's simplified method only (Table 5 note G); other methods also use 1.0, which is not calibrated or validated, and Slope says so beside the result.
• Bond factors are for a characteristic bond stress chosen empirically or calculated from soil properties (4.3): γτb 1.1 / 1.5. For bond from pull-out tests, duplicate Set 1 or Set 2 and enter the Table 6 value (4.3.6): Set 1 1.1–1.3 in coarse-grained soils, 1.5–1.7 in medium and high plasticity soils; Set 2 1.5–1.7 and 2.0–2.25. A copy runs its one set (check the other set with its own copy), and its γτb applies to every nail.
• γs = 1.15 is for steel tendons; other tendon materials need their own factor.
• Nail heads and facing (4.7) are not checked; the plate term is unfactored.
• Anchors, geosynthetic and steel layers and piles are outside BS 8006-2 and are unfactored.
• Table 5 note A's +10 % names Table 5's factors; whether it applies to a Table 6 bond factor is not stated, so a copy of a GC3 set takes the γτb the designer enters.

Known limitations

• Geotechnical Category 3 (Table 5 note A): every non-unity factor of Table 5 is increased by 10 %.
• Pore pressure follows each slice's soil factor (Slope's water rule); Table 5 gives γu = 1.0.
• γSd = 1.0 is supported for Bishop's simplified method only (Table 5 note G); other methods also use 1.0, which is not calibrated or validated, and Slope says so beside the result.
• Bond factors are for a characteristic bond stress chosen empirically or calculated from soil properties (4.3): γτb 1.1 / 1.5. For bond from pull-out tests, duplicate Set 1 or Set 2 and enter the Table 6 value (4.3.6): Set 1 1.1–1.3 in coarse-grained soils, 1.5–1.7 in medium and high plasticity soils; Set 2 1.5–1.7 and 2.0–2.25. A copy runs its one set (check the other set with its own copy), and its γτb applies to every nail.
• γs = 1.15 is for steel tendons; other tendon materials need their own factor.
• Nail heads and facing (4.7) are not checked; the plate term is unfactored.
• Anchors, geosynthetic and steel layers and piles are outside BS 8006-2 and are unfactored.
• Table 5 note A's +10 % names Table 5's factors; whether it applies to a Table 6 bond factor is not stated, so a copy of a GC3 set takes the γτb the designer enters.