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Sonic UCS Rock Strength Calculator

Estimate rock strength from wireline sonic logs using the Seedsman et al. (2009) relationship for coal measure rocks.

🧮 Calculator

m/s

🔍 What is the Sonic UCS Rock Strength Calculator?

This calculator uses wireline sonic logs to estimate Uniaxial Compressive Strength (UCS) for coal measure rocks, following the empirical relationship published by Seedsman et al. (2009). By taking sonic velocity data directly from your geophysical wireline logs, it offers a rapid way to gauge rock strength without waiting for lab tests.

⏱️ Why and When to Use It

If you're working in coal measure strata and have access to sonic log data, this tool lets you easily convert those readings into a practical strength figure. It's especially useful in the early stages of exploration when you want a quick read on rock competency, or during operations to keep an eye on changing conditions.

By turning velocity data into a straightforward UCS estimate, you can make more informed decisions about support design and risk management—giving you a heads-up on any potential issues before they escalate. And since it's all done online, there's no need for heavy-duty software or lengthy calculations.

📊 Technical Background

The Seedsman et al. (2009) relationship for estimating UCS from sonic velocity is:

UCS (MPa) = 0.035 × e^(1.35 × Vp)

Where:

UCS = Uniaxial Compressive Strength in MPa

Vp = P-wave velocity in km/s

e = Mathematical constant (approximately 2.71828)

This relationship was developed specifically for coal measure rocks and has been validated through extensive laboratory testing. It provides a reliable estimate of rock strength when direct testing is not available or practical.

Key Benefits

  • Non-Destructive Testing: Estimate rock strength without physical samples
  • Rapid Assessment: Get immediate strength estimates from existing wireline data
  • Cost-Effective: Reduce the need for extensive laboratory testing
  • Continuous Profiling: Generate strength profiles throughout the entire borehole
  • Early Design Input: Incorporate strength data into geotechnical designs earlier in projects

🏗️ Applications

The Sonic UCS Calculator is particularly valuable for:

Mining Engineering

  • Roof and rib support design
  • Pillar stability assessment
  • Longwall mining planning
  • Ground control management

Exploration & Development

  • Resource evaluation
  • Geotechnical domain mapping
  • Mine planning and feasibility studies
  • Risk assessment

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