Hi,
Now I am doing the natural gouge experiment using the triaxial appratus.
and I am confused by the samples' XRD data.
The black natural gouge sample(water-saturated) is very soft and smoothly when you touch it, and it looks very like cohesive soil.
but the XRD data showes the major mineral content is quartz (90%)and the clay mineral is little (3%).
anyone can give me some advice why the sample(containing very high quartz content) looks like cohesive soil, and its fricitonal strength
is low to 0.3-0.35?
