Lec11 - Removal of support Addition of mass Orientation of...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology Civil Engineering 70 Lecture 11 10/2/07 CE 70 Midterm has been postponed New Date: Thursday, October 25, 2007 in Sibley Auditorium Mass Wasting o Friction Angle vs. Angle of Repose o Role of Water o Landslide Features o Landslide Types o Factor of Safety Landslides (Mass-Wasting) o Are pretty ubiquitous Where ever you have hills and gravity Generally includes failure sof natural materials Significant geomorphic agent Recognition is critical to mitigating damage o Slope steepness Fine Sand – 35 degrees Coarse Sand – 40 degrees Angjular pebbles – 45 degrees o Cohesiveness Damp Sand Dry Sand Water Saturated Sand More cohesive Less cohesive Factors influencing Slope Stability o Strength Properties Presence of minerals with low friction angle Clays, micas, graphite, talc, serpentine o Geometric Parameters
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Removal of support Addition of mass Orientation of discontinuities o Presence of water and high pore pressure o Factor of Safety = 1 Metastable Lecture 11 1 of 2 10/2/07 Written By Raymond Leung University of California, Berkeley Professor Ken Johnson Civil Engineering 70 Engineering Geology < 1 Failure > 1 Stable Identify Landslide features o Scars in the hill Types of Mass Movement o Debris flow has more crap in it than mudflow which is uniform sediments o Rock falls, avalanches and debris slides are fast o Earth flow and and slump and earth creep is slower Shale bedding is composed of clay and is slippery o Can cause land slide Hummocky Terrain o All bumping and wiggly Landslide mitigations o Take Material from the scarp and put it at the toe o Lecture 11 2 of 2 10/2/07 Written By Raymond Leung...
View Full Document

Page1 / 2

Lec11 - Removal of support Addition of mass Orientation of...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online