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- Title
Halloysite behaving badly: geomechanics and slope behaviour of halloysite-rich soils.
- Authors
Moon, Vicki
- Abstract
Halloysite-rich soils derived from in situ weathering of volcanic materials support steep stable slopes, but commonly fail under triggers of earthquakes or rainfall. Resulting landslides are slide-flow processes, ranging from small translational slides to larger rotational failures with scarps characteristic of sensitive soils. Remoulding of failed materials results in high-mobility flows with apparent friction angles of 10-16°. The materials characteristically have high peak-friction angles (∼25- 37°), low cohesion (∼12-60 kN m-2) and plasticity ( plasticity index ∼10-48%), and low dry bulk density (∼480-1,080 kg m-3) with small pores due to the small size of the halloysite minerals. They remain saturated under most field conditions, with liquidity indexes frequently >1. Remoulded materials have limited cohesion (<5 kN m-2) and variable residual friction angles (15°-35°). Halloysite mineral morphology affects the rheology of remoulded suspensions: tubular minerals have greater viscosity and undrained shear strength than spherical morphologies.
- Subjects
HALLOYSITE; SLOPES (Soil mechanics); WEATHERING; SOIL cohesion; EARTHQUAKES; RAINFALL
- Publication
Clay Minerals, 2016, Vol 51, Issue 3, p517
- ISSN
0009-8558
- Publication type
Article
- DOI
10.1180/claymin.2016.051.3.09