What is the hazard being associated with slope failure?
Landslides include a wide range of phenomena involving downslope ground movement, such as rockfalls, deep slope failure, shallow debris flows, and avalanches. Gravity acting on a slope is the primary cause of landslides, but there are other important and dynamic factors that serve as triggers.
What are the factors affecting slope stability?
Slope stability is ultimately determined by two factors: the angle of the slope and the strength of the materials on it. In Figure 15.2 a block of rock situated on a rock slope is being pulled toward Earth’s centre (vertically down) by gravity.
What are three factors that contribute to an unsafe slope?
Common Causes of Slope Failure
- Steepness of the Slope. It goes without saying that the steeper a slope is, the more unstable it will be.
- Water and Drainage. Water is several times heavier than air.
- Soil Composition.
- Joints & Fractures.
What are the types of hazards?
The six main categories of hazards are:
- Biological. Biological hazards include viruses, bacteria, insects, animals, etc., that can cause adverse health impacts.
- Chemical. Chemical hazards are hazardous substances that can cause harm.
- Physical.
- Safety.
- Ergonomic.
- Psychosocial.
What is factor of safety in slope stability?
The slope stability safety factor refers to the ratio of the soil shear strength to the shear stress of a possible sliding surface in the slope.
What is the harmful effects of landslide?
In the United States, landslides and debris flows result in 25 to 50 deaths each year. The health hazards associated with landslides and mudflows include: Rapidly moving water and debris that can lead to trauma; Broken electrical, water, gas, and sewage lines that can result in injury or illness; and.
What can cause a stable slope to become unstable?
The Role of Water Since water is heavier than air, this increases the weight of the soil. Weight is force, and force is stress divided by area, so the stress increases and this can lead to slope instability. Water has the ability to change the angle of repose (the slope angle which is the stable angle for the slope).
What is the most common type of slope failure?
Toe failure
Toe failure is the most common situation and it occurs when the failing surface passes through the slope’s toe.
What is the cause of slope failure?
Slope failures occur when driving forces overcome resisting forces. The driving force is typically gravity, and the resisting force is the slope material’s shear strength. When assessing a slope’s stability look for indications that physical processes are decreasing shear strength.
What are the internal causes of slope failure?
(1)steepening the slope; (2)removing support from low on a slope; as by stream or ocean-wave erosion; (3)adding mass high on a slope, as in sediment depositon. (4)Human triggering landslides, such as removing material from the base of the slope to widen or clear a road; fill dirt on hill slopes to make more view lots.
What are harmful earthquake effects?
Earthquakes can trigger landslides and mudslides, especially in areas with water-soaked soils. Landslides may result in falling rocks and debris that collide with people, trees, animals, buildings and vehicles. They also can block roads and disrupt utility lines.
What causes slope failures?