GEOL 118 Lecture 21: Landslides III
9 Apr 2016
School
Department
Course
Professor
Document Summary
Geol 118 - lecture 21 - landslides iii. Mapping and zoning - need detailed maps of known landslide areas. Generate landslide hazard maps, which give potential for future landslides. Building codes - rules to ensure good construction practice. Examples: requirements for drainage, soil compaction, slope angle (< 27 degrees), dealing with planes of weakness. Water drainage- don"t allow water to build up within slope ( shear strength) Install horizontal plastic pipes to drain water from within slope, surface drains, or impermeable seals on top of slope. Proper grading of slope - remove material from top of landslide (< driving force), place it at toe of landslide (> resisting force) Create benches (small steps in slope) to prevent large landslides. Retaining walls- steel-reinforced concrete wall at vertical face to strengthen slope (>resisting force) Wire mesh fencing or sprayed concrete (shotcrete) For steep bedrock slopes and tunnels in bedrock, bolts can be installed to strengthen rock.
