š Case Study
Historic Landslide Reactivation Mitigation ā Portuguese Riviera
Complex kinematics (translational + rotational), marine clay layer at depth, saltwater intrusion affecting pore pressure regime
šļø Project Overview
Stabilization of a reactivated 1952 landslide threatening heritage villas and coastal road
šÆ Challenge
Complex kinematics (translational + rotational), marine clay layer at depth, saltwater intrusion affecting pore pressure regime
š§ Design Approach
Deep soil mixing (DSM) columns along basal shear zone + horizontal drainage galleries + piezometric relief wells + fiber-optic strain sensing
š Design Diagram
AI-generated project design illustration
š Key Calculations
DSM Column Spacing (Tensile Breakout)
s ā¤ ā(ĻĀ·Ļ_uĀ·DĀ²/(4Ā·Ļ_v'))
Result: 1.9 m
Ensured composite strength across failure plane
Relief Well Yield (Theis)
Q = (2Ā·ĻĀ·TĀ·s)/ln(R/r_w)
Result: 4.2 L/s/well
Achieved 40 kPa pore pressure reduction at shear zone
Fiber-Optic Strain Resolution
Īµ_min = ĪĪ»_B / (Ī»_BĀ·k_Īµ)
Result: 10 Ī¼Īµ
Detected micro-strain precursors 72h before macro-movement
š Results
Landslide arrested within 6 months; no further movement over 5 years; villa foundations stabilized to <0.3 mm/yrš” Lessons Learned
- ā¢Saltwater intrusion necessitated stainless-steel well casings and corrosion-resistant sensors
- ā¢DSM mixing energy had to be reduced near historic masonry to avoid vibration damage
- ā¢Fiber-optic sensing enabled predictive maintenance of drainage system
ā Key Takeaways
- 1Saltwater intrusion necessitated stainless-steel well casings and corrosion-resistant sensors
- 2DSM mixing energy had to be reduced near historic masonry to avoid vibration damage
- 3Fiber-optic sensing enabled predictive maintenance of drainage system