What Is the Critical Hydraulic Gradient & Quicksand Boiling Calculator?
When upward seepage flow through granular soil balances the submerged self-weight of the soil grains, effective stress drops to zero, causing quicksand liquefaction.
This calculator evaluates the critical hydraulic gradient i_cr and factor of safety against boiling around cofferdams, excavations, and weir foundations.
How Does the Critical Hydraulic Gradient & Quicksand Boiling Calculator Work?
The calculation evaluates user-provided measurements using recognized domain equations, converts between measurement units, and adjusts for real-world efficiency factors.
Critical Hydraulic Gradient & Quicksand Boiling Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Evaluates the zero effective stress condition where upward hydrodynamic seepage pressure cancels submerged buoyant soil weight.
How to Use the Critical Hydraulic Gradient & Quicksand Boiling Calculator
- Enter your primary measurements in the input fields above.
- Select your preferred units (e.g. metric or imperial) if applicable.
- Review or adjust operational assumptions such as field efficiency.
- Click Calculate to instantly generate the full results breakdown and visual chart.
- Use the Reset button at any time to clear the form and test a new scenario.
Step-by-Step Example Calculation
Medium dense sand excavation with Gs = 2.65 and e = 0.65 subject to upward gradient i = 0.40
Input Values:
Understanding Your Result
Your calculated result represents the realistic operational capacity or baseline output under the specified conditions. Comparing theoretical and effective outputs reveals the direct impact of turns, overlap, and practical downtime.
Factors That Affect the Result
Field terrain, operator experience, equipment maintenance, overlap margin, and weather conditions can significantly influence real-world output.
When Should You Use This Calculator?
Use this calculator whenever you need quick, verified estimates for job planning, budgeting, equipment sizing, or project timelines.
Assumptions & Limitations
- Geotechnical Hydraulics
- Foundation Engineering
- Soil Mechanics
Frequently Asked Questions
Calculation Accuracy & Reference Note
This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.