Dispersive Clay
nounPronunciation: /dɪˈspɜrsɪv kleɪ/
Fine-grained soil particles, particularly sodium-rich clays, that separate and migrate through pores under hydrodynamic stress, reducing soil cohesion and creating internal erosion pathways. This phenomenon is particularly problematic in embankments and dams at abandoned mine sites.
Plain English
Sodium-rich clay that easily breaks apart and moves through soil when water flows through it, causing internal erosion and structural weakness.
Etymology & History
Usage
"The geotechnical assessment identified dispersive clay in the tailings dam embankment, necessitating urgent stabilization measures."
Style guide notes: Always specify sodium content or dispersion index values when assessing dispersive clay risk in regulatory documents.
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Frequently Asked Questions
Why is dispersive clay problematic in mine reclamation?
It causes internal erosion in dams and embankments, creating piping failure pathways that can lead to catastrophic collapse.
How can dispersive clay be managed in tailings structures?
Through clay stabilization treatments, covering with non-dispersive material, or hydraulic controls to minimize seepage gradients.
Why Test Candidates on This?
Specialized knowledge relevant for assessing geotechnical stability of tailings dams and designing erosion prevention measures.
Required skill level: Senior