What controls the stability of slopes?
James Craig
Updated on February 22, 2026
Slope stability is ultimately determined by two factors: the angle of the slope and the strength of the materials on it. In Figure 15.2c, the slope is steeper still, so the shear force is considerably greater than the shear strength, and the block will very likely move.
Furthermore, what factors affect slope stability?
Five factors influence slope stability of an embankment: 1) Shear strength of the soil; 2) Unit weight; 3) Embankment height; 4) Slope steepness; and 5) Pore pressure within the soil.
Likewise, how do you make a slope more stable? The Role of Water
- Addition of water from rainfall or snow melt adds weight to the slope. Water can seep into the soil or rock and replace the air in the pore space or fractures.
- Water has the ability to change the angle of repose (the slope angle which is the stable angle for the slope).
Herein, what are three factors that decrease slope stability?
Important parameters of slope geometry affecting its stability include height and angle of slope. The critical height of slope depends on shear strength, density and bearing capacity of the slope foundation. Slope stability generally decreases with increase in height of slope.
What is factor of safety 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.
Related Question Answers
How do human activities affect slope stability?
Landslides are commonly natural events. Yet, human actions may reduce the stability of slopes and even trigger landslide events. In many cases landslides were caused because people have built structures near or on unstable slopes. Various types of human activities may favour and/or trigger mass movement processes.What are the three types of slope failure?
Types of Slope Failures- Translational Failure.
- Rotational Failure.
- Wedge Failure.
- Compound Failure.
How do you fix slope failure?
Below are some of the common methods used for slope failure mitigation and repair:- Drainage. Contractors who know what they're doing will always draw up drainage plans to complement their slope repair plans.
- Terracing & Benching.
- Retaining Walls.
- Friction Piles.
- Sheet Piling.
- Rock Bolts.
- Shotcrete.
- Geo-grid.
How do you control slope failure?
A series of "stair-steps" can be created on very steep slopes. Engineering methods can be used to help prevent slope failure. Retaining walls, rock bolts, and "shotcrete" (coating of concrete-rock mixture on slope surface and crevices to prevent water entry) are used to inhibit slope failure.What is the effect of sudden drawdown on stability of a slope?
Because of the rapid drawdown there will be a decrease in the slope stability which might lead to instability in slopes that do not have sufficient level of safety against failure.How does water affect slope stability?
Water can seep into the soil or rock and replace the air in the pore space or fractures. Since water is heavier than air, this increases the weight of the soil. Water has the ability to change the angle of repose (the slope angle which is the stable angle for the slope).How do you determine slope stability?
Stability is determined by the balance of shear stress and shear strength. If the forces available to resist movement are greater than the forces driving movement, the slope is considered stable. A factor of safety is calculated by dividing the forces resisting movement by the forces driving movement.What is slope failure?
A slope failure is a phenomenon that a slope collapses abruptly due to weakened self-retainability of the earth under the influence of a rainfall or an earthquake. Because of sudden collapse of slope, many people fail to escape from it if it occurs near a residential area, thus resulting in a higher rate of fatalities.What are the causes of slope failure?
Causes of Slope Failure.- Erosion. Water and wind continuously erode natural and man-made slopes.
- Rainfall. Long periods of rainfall saturate, soften, and erode soils.
- Earthquakes. Earthquakes induce dynamic forces (Figure 16.3d), especially dynamic shear forces that reduce the shear strength and stiffness of the soil.
What is the difference between slump and creep?
They are both a form of mass wasting and have the same causes. The difference between a creep and a slump is that a creep moves slowly and gradually while a slump is faster and causes more drastic changes in terrain.What are the two forces that act on slope stability?
Slope stability is based on the interplay between two types of forces, driving forces and resisting forces. Driving forces promote downslope movement of material, whereas resisting forces deter movement. So, when driving forces overcome resisting forces, the slope is unstable and results in mass wasting.What factors contribute to Oversteepening of slopes?
Although gravity acting on an over-steepened slope is the primary reason for a landslide, there are other contributing factors: erosion by rivers, glaciers, or ocean waves create oversteepened slopes. rock and soil slopes are weakened through saturation by snowmelt or heavy rains.What is the specific angle of repose for most stable slopes?
The angle of repose, or critical angle of repose, of a granular material is the steepest angle of descent or dip relative to the horizontal plane to which a material can be piled without slumping. At this angle, the material on the slope face is on the verge of sliding. The angle of repose can range from 0° to 90°.Why does the removal of material at the base of a slope decrease its stability?
Why does the removal of material at the base of a slope decrease its stability? A. Removing material decreases the surface tension between grains. The force of gravity decreases, and the slope will fail.What is the difference between weathering and erosion?
The primary difference between weathering and erosion is that weathering occurs in place whereas erosion involves movement to a new location. Both are caused by similar factors of wind, water, ice, temperature, and even biological action. They can also occur together.What other natural or manmade occurrences could cause a slope to fail?
Slope Failure Triggering Mechanisms: Water-Level Change. Seepage Water Flow. Volcanic Eruption. Earthquake Shaking.What is the most common form of mass wasting?
The most common mass-wasting types are falls, rotational and translational slides, flows, and creep. Falls are abrupt rock movements that detach from steep slopes or cliffs. Rocks separate along existing natural breaks such as fractures or bedding planes. Movement occurs as free-falling, bouncing, and rolling.What is natural slope?
Definition of natural slope. : the slope assumed by a mass of earth thrown up into a heap.What is the fastest type of mass movement?
Rockfalls occur when rock fragments fall from steep cliffs. This is the fastest type of mass movement. The fragments may be as tiny as pebbles or as huge as giant boulders. Landslides occur when large amounts of loose rock combined with soil fall suddenly down a slope.How does rainfall affect soil stability?
Changes in precipitation affect vegetation which has impacts on soil organic matter cycle and the texture of soil. This can influence the runoff rate and formation of surface crusts, which affect erosion and cause deterioration. Several soil properties were measured in a total of 469 topsoil samples.What can be done to a slope to make a landslide less likely?
potential sliding surface is reduced. cohesion between grains may reduce the potential for slope failure. loose unconsolidated material is formed into a pile. adding weight, destroying cohesion between grains, and reducing friction.What is a slope protection?
Protection to slope by rigid surface. Rigid surface protection on slopes are commonly used to reduce rainwater infiltration and to prevent erosion of the slope- forming materials. This can be done by: Chunam plastering – this is an applied-on surface protection to slope using a clay and cement mixed plaster.Which areas are most susceptible to slope failure?
html) shows areas with greatest potential for landslides and other slope failure events (in red and pink colors). The areas at greatest risk are in mountainous regions (Fig. 2) with relatively steep slopes such as the Appalachians, Rockies, and mountain ranges of California.What are the types of slope failure?
Soil slope failures are generally of four types : Translational Failure. Rotational Failure. Wedge Failure.Rotational Failure
- Face failure or slope failure.
- Toe failure.
- Base failure.
