Geostudio 2012 Full: Top Crack 19
| Layer | Model | Key Parameters | |-------|-------|----------------| | Sand (1 & 3) | Mohr‑Coulomb + Elastic (E = 25 MPa, ν = 0.3) | c, φ, σ_t | | Clay (2) | Modified Cam‑Clay (M = 1.2, λ = 0.12, κ = 0.04) | Initial pre‑consolidation stress = 80 kPa | | All layers | Tension‑crack (TC) | σ_t = 0.5 kPa, crack opening displacement limited to 5 mm |
The TC option creates a zero‑stress element when the normal stress on a potential crack plane becomes tensile and exceeds σ_t, thereby allowing the element to open and reduce its stiffness in the normal direction. geostudio 2012 full top crack 19
The tensile stress σtens at the slope surface was extracted along the crest. Figure 2 plots σtens versus time. The surface tension becomes positive (i.e., tensile) at t ≈ 3 h and reaches the prescribed σ_t (0.5 kPa) at t = 5.8 h, marking the onset of cracking. | Layer | Model | Key Parameters |
If you're looking for access to GeoStudio or similar software for educational or professional purposes, consider the following: The surface tension becomes positive (i
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| Parameter | Value | Description |
|-----------|-------|-------------|
| Geometry | 40 m high, 1:1.5 (H:V) slope, crest width 5 m | Homogeneous triangular slope |
| Soil stratigraphy | Layer 1 (0–5 m): silty sand (γ = 18 kN m⁻³)
Layer 2 (5–20 m): soft clay (γ = 17 kN m⁻³)
Layer 3 (20–40 m): dense sand (γ = 19 kN m⁻³) | Three‑layer model with varying permeability |
| Hydraulic conductivity (k) | 1.0 × 10⁻⁴ m s⁻¹ (sand)
1.0 × 10⁻⁸ m s⁻¹ (clay) | Contrast creates high pore‑pressure gradients |
| Cohesion (c) | 5 kPa (sand), 15 kPa (clay) | Mohr‑Coulomb parameters |
| Friction angle (φ) | 30° (sand), 20° (clay) | — |
| Tensile strength (σ_t) | 0.5 kPa (all layers) | Implemented via TC option |
| Initial water level | 30 m (upstream side) | Saturated condition |
| Drawdown event | Instantaneous drop to 5 m at t = 0 h | Simulates rapid reservoir drawdown |
| Analysis period | 0–72 h | Time‑dependent consolidation considered |
The case is idealised but reproduces the salient mechanisms leading to FTTC formation: (i) rapid drawdown induces a steep hydraulic gradient, (ii) low‑permeability clay traps water, and (iii) the weak tensile capacity of the surface soil allows opening of a crack.
