Summary of supplementary phase ground investigations material characterisation testing of Lower Lias clay and mudrock
| Property | Weathered clay/mudstone (number of determinations) | Fresh mudstone (number of determinations) | |
|---|---|---|---|
| Material description | Stiff and very stiff brown grey clay – from depths of 0·6–4·6 mbgl | Weak laminated grey mudstone – from depths of 4–9·7 mbgl | |
| Moisture content, w: % | 10–48 (42) | 15·3–19·4 (7) | |
| Liquid limit, w L: % | 52–102 (30) | 54–63 (4) | |
| Plastic limit, w P: % | 22–50 (30) | 25–33 (4) | |
| Plastic index, I P: % | 28–55 (30) | 23–28 (4) | |
| UUTx – undrained shear strength | c u: kPa | 95–314 (18) | — |
| CUTx – effective stress | c′: kN/m2 | 4–28 (6) | — |
| φ′: degrees | 21·5–37 (6) | — | |
| Oedometer consolidation (100–400 kPa stress range) | m v: m2/MN | 0·081–1·069 (8) | — |
| c v: m2/year | 0·109–2·79 (8) | — | |
| UCS: MPa | — | 0·43–63 (18) | |
| CBR (lab) | 2–12 (16) | 11–20 (4) | |
| Property | Weathered clay/mudstone | Fresh mudstone | |
|---|---|---|---|
| Material description | Stiff and very stiff brown grey clay – from depths of 0·6–4·6 mbgl | Weak laminated grey mudstone – from depths of 4–9·7 mbgl | |
| Moisture content, | 10–48 (42) | 15·3–19·4 (7) | |
| Liquid limit, | 52–102 (30) | 54–63 (4) | |
| Plastic limit, | 22–50 (30) | 25–33 (4) | |
| Plastic index, | 28–55 (30) | 23–28 (4) | |
| UUTx – undrained shear strength | 95–314 (18) | — | |
| CUTx – effective stress | 4–28 (6) | — | |
| 21·5–37 (6) | — | ||
| Oedometer consolidation (100–400 kPa stress range) | 0·081–1·069 (8) | — | |
| 0·109–2·79 (8) | — | ||
| UCS: MPa | — | 0·43–63 (18) | |
| CBR (lab) | 2–12 (16) | 11–20 (4) | |
UUTx, unconsolidated undrained triaxial test; CUTx, consolidated undrained triaxial test; m V, coefficient of volume compression; c V, coefficient of consolidation; UCS, unconfined compressive strength; CBR, California bearing ratio.
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