π Case Study
Limestone Quarry Slope Stabilization
Progressive bench failure due to bedding plane sliding and groundwater infiltration
ποΈ Project Overview
Michigan Limestone & Chemical Company, USA β 120 m high quarry wall
π― Challenge
Progressive bench failure due to bedding plane sliding and groundwater infiltration
π§ Design Approach
Drainage blanket + horizontal drains + toe buttressing + selective bench scaling and meshing
π Design Diagram
AI-generated project design illustration
π Key Calculations
Shear Strength along Bedding Plane
c + Οβ tan Ο
Result: 125 kPa
Determines interlayer sliding resistance
Factor of Safety (Bishop Method)
Ξ£(cΒ·l + (W β uΒ·l)tanΟ)/Ξ£(WΒ·sinΞ±)
Result: 1.28
Minimum acceptable FS = 1.3 for active slopes
π Results
Stabilized slope with FS >1.4; eliminated unplanned shutdowns; extended quarry life by 8 yearsπ‘ Lessons Learned
- β’Hydrogeological mapping is as critical as geotechnical testing
- β’Horizontal drains reduced pore pressure by 65% within 6 months
- β’Toe buttressing provided immediate kinematic restraint
β Key Takeaways
- 1Hydrogeological mapping is as critical as geotechnical testing
- 2Horizontal drains reduced pore pressure by 65% within 6 months
- 3Toe buttressing provided immediate kinematic restraint