Summary of available records from main phase and supplementary ground investigations material characterisation testing of Oxford clay and calcareous siltstone units
| Property | Weathered clay/mudstone (number of determinations) | Fresh calcareous siltstone (number of determinations) | |
|---|---|---|---|
| Material description | Firm brown to very stiff greenish grey silty clay | Weak and medium strong light brown calcareous siltstone | |
| Moisture content, w: % | 12–58 (32) | 10–22 (3) | |
| Liquid limit, w L: % | 24–83 (316) | — | |
| Plastic limit, w P: % | 14–32 (298) | — | |
| Plastic index, I P: % | 8–55 (298) | — | |
| UUTx – undrained shear strength | 0–1 m | 25–100 (5) | — |
| 1–10 m | 28–292 (44) | ||
| c u: kPa (for depth range in mbgl) | 10–20 m | 82–570 (38) | |
| CUTx – effective stress | c′: kN/m2 | 1–6 (36) | — |
| φ′: degrees | 21–25 (36) | — | |
| UCS: MPa | — | 25·3–49·5 (6) | |
| Property | Weathered clay/mudstone | Fresh calcareous siltstone | |
|---|---|---|---|
| Material description | Firm brown to very stiff greenish grey silty clay | Weak and medium strong light brown calcareous siltstone | |
| Moisture content, | 12–58 (32) | 10–22 (3) | |
| Liquid limit, | 24–83 (316) | — | |
| Plastic limit, | 14–32 (298) | — | |
| Plastic index, | 8–55 (298) | — | |
| UUTx – undrained shear strength | 0–1 m | 25–100 (5) | — |
| 1–10 m | 28–292 (44) | ||
| 10–20 m | 82–570 (38) | ||
| CUTx – effective stress | 1–6 (36) | — | |
| 21–25 (36) | — | ||
| UCS: MPa | — | 25·3–49·5 (6) | |
UUTx, unconsolidated undrained triaxial test; CUTx, consolidated undrained triaxial test; UCS, unconfined compressive strength.
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