What are the factors affecting slope stability?
What are the factors affecting slope stability?
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 is the minimum factor of safety for slope stability?
1.25
For general slope stability analysis of permanent cuts, fills, and landslide repairs, a minimum safety factor of 1.25 should be used. Larger safety factors should be used if there is significant uncertainty in the analysis input parameters.
How is slope stability determined?
What are the various methods to improve stability of slopes?
Stability of slopes can also be improved by: Flattening of slopes results in reduction in weight which makes the slope more stable. Soil stabilization. Providing lateral supports by piles or retaining walls.
What are three factors that decrease slope stability?
Weathered geology: Weak, weathered bedrock, jointed rock, or bedrock that dips parallel to the slope can decrease stability. Vegetation removal: Droughts, wildfires and humans can remove vegetation from the slope, decreasing stability. Freeze/thaw cycles: Water in rock joints or in soils can decrease slope stability.
How can water add stability of slope?
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).
What is the importance of slope stability?
Slope stability is an important consideration in the management of many types of mining operations or civil engineering projects. Slope Stability – By definition, slope stability is a measure of how resistant a natural or man-made slope is to failure due to collapse or sliding.
What is the easiest way to increase the stability of a slope?
Sheet piles and retaining wall structures can be installed to provide lateral support and to increase the stability. Stabilization of the soil helps in enhancing the stability of slopes. Other relative inexpensive methods like for slope flattening and drainage control may be usually applied.
How human activities influences the slope stability?
Human activities account in various ways for instabilities on slopes: Modified slopes (e,g, due to ski-run construction), deforestation, the construction of highways, hillside housing developments, dams, reser- voirs, drainage and utility structures normally involve the movement of substantial amounts of soil or rock …
What are the types of slope failures?
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.
What is factor of safety slope stability?
A value of factor of safety greater than 1.0 indicates that capacity exceeds demand and that the slope will be stable with respect to sliding along the assumed particul ar slip surface analyzed. A value of factor of safety less than 1.0 indicates that the slope will be unstable.
What is slope stability safety factor?
The stability of a slope is essentially controlled by the ratio between the available shear strength and the acting shear stress, which can be expressed in terms of a safety factor if these quantities are integrated over a potential (or actual) sliding surface. A slope can be globally stable if the safety factor,…
What is global slope stability?
A slope can be globally stable if the safety factor, computed along any potential sliding surface running from the top of the slope to its toe, is always larger than 1. The smallest value of the safety factor will be taken as representing the global stability condition of the slope.