๐ Case Study
Midwest Agricultural Land Tracker Soil-Structure Interaction Settlement
Differential settlement >12 mm across 10-row sections causing tracker binding and torque sensor faults
๐๏ธ Project Overview
150MW tracker installation on reclaimed farmland with compressible clay subsoil
๐ฏ Challenge
Differential settlement >12 mm across 10-row sections causing tracker binding and torque sensor faults
๐ง Design Approach
Switched from driven piles to auger-cast micropiles with load-transfer plates; performed full-field CPT testing; implemented 3D finite element soil-structure model (PLAXIS 2D)
๐ Design Diagram
AI-generated project design illustration
๐ Key Calculations
Settlement Differential Limit
ฮด_max โค L/500
Result: 16 mm
Original design exceeded limit by 2.3ร
Micropile Group Efficiency
ฮท = Q_group / (n ร Q_single)
Result: 0.87
Validated load-sharing assumption for 5-pile group
๐ Results
Max differential settlement reduced to 4.1 mm; zero binding incidents over 24 months๐ก Lessons Learned
- โขCPT-derived modulus values must be calibrated to field plate-load tests
- โขLoad-transfer plates increase group efficiency but require precise embedment depth control
โ Key Takeaways
- 1CPT-derived modulus values must be calibrated to field plate-load tests
- 2Load-transfer plates increase group efficiency but require precise embedment depth control