Presentation 2

5/20/2018 Presentation 2

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ENGLISH

SCIENCE &TECHNOLOGY

Mr. Henry Anandan


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Title : Landslide

Members : Md. Adib

: Julian

: NJ

: Sharmimie: Shazlyn


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LANDSLIDE

A landslideor landslipis a geologicalphenomenonwhich includes

a wide range ofground movement, such as rockfalls, deepfailure ofslopesand shallow debrisflows, which

can occur in

offshore, coastal and onshoreenvironments. Although the action of gravityisthe primary driving force for a landsl

ide tooccur, there are othercontributing factorsaffecting the original slope stability. Typically,

pre-conditional factors

build up specific sub-surface conditions that make the area/slopeprone to failure, whereas the actual landslideoften requires a trigger before being released.
http://en.wikipedia.org/wiki/List_of_geological_phenomenahttp://en.wikipedia.org/wiki/List_of_geological_phenomenahttp://en.wikipedia.org/wiki/List_of_geological_phenomenahttp://en.wikipedia.org/wiki/List_of_geological_phenomenahttp://en.wikipedia.org/wiki/List_of_geological_phenomenahttp://en.wikipedia.org/wiki/Rockfallhttp://en.wikipedia.org/wiki/Rockfallhttp://en.wikipedia.org/wiki/Slopehttp://en.wikipedia.org/wiki/Rockfallhttp://en.wikipedia.org/wiki/Debrishttp://en.wikipedia.org/wiki/Rockfallhttp://en.wikipedia.org/wiki/Slopehttp://en.wikipedia.org/wiki/Debrishttp://en.wikipedia.org/wiki/Gravityhttp://en.wikipedia.org/wiki/Gravityhttp://en.wikipedia.org/wiki/Slope_stabilityhttp://en.wikipedia.org/wiki/Slope_stabilityhttp://en.wikipedia.org/wiki/Slope_stabilityhttp://en.wikipedia.org/wiki/Gravityhttp://en.wikipedia.org/wiki/Debrishttp://en.wikipedia.org/wiki/Slopehttp://en.wikipedia.org/wiki/Rockfallhttp://en.wikipedia.org/wiki/List_of_geological_phenomenahttp://en.wikipedia.org/wiki/List_of_geological_phenomena


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CAUSES OF LANDSLIDE

Landslides occur when the stability

of a slopechanges from a stable to

an unstable condition. A change inthe stability of a slope can be caused

by a number of factors, acting

together or alone. Natural causes of

landslides include:
http://en.wikipedia.org/wiki/Slope_stabilityhttp://en.wikipedia.org/wiki/Slope_stabilityhttp://en.wikipedia.org/wiki/Slope_stabilityhttp://en.wikipedia.org/wiki/Slope_stability


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Loss or absence of

vertical vegetativestructure, soil nutrients,and soil structure(e.g.after a wildfire)

groundwater(porewater)pressure acting todestabilize the slope

erosionof the toe

of a slope by riversor ocean waves

weakening of a slope

through saturation bysnowmelt, glaciersmelting, or heavy rains
http://en.wikipedia.org/wiki/Soil_structurehttp://en.wikipedia.org/wiki/Wildfirehttp://en.wikipedia.org/wiki/Groundwaterhttp://en.wikipedia.org/wiki/Erosionhttp://en.wikipedia.org/wiki/Wavehttp://en.wikipedia.org/wiki/Glacierhttp://en.wikipedia.org/wiki/Glacierhttp://en.wikipedia.org/wiki/Wavehttp://en.wikipedia.org/wiki/Erosionhttp://en.wikipedia.org/wiki/Groundwaterhttp://en.wikipedia.org/wiki/Wildfirehttp://en.wikipedia.org/wiki/Soil_structure


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Landslides are aggravated by human

activities, Human causes include:

deforestation, cultivationand construction,which destabilize the already fragile slopes

vibrationsfrom machineryor traffic

earthworkwhich alters the shape of

a slope, or which imposes newloads on an existing slope

blasting
http://en.wikipedia.org/wiki/Deforestationhttp://en.wikipedia.org/wiki/Tillagehttp://en.wikipedia.org/wiki/Constructionhttp://en.wikipedia.org/wiki/Oscillationhttp://en.wikipedia.org/wiki/Machinehttp://en.wikipedia.org/wiki/Traffichttp://en.wikipedia.org/wiki/Earthworks_(engineering)http://en.wikipedia.org/wiki/Explosive_materialhttp://en.wikipedia.org/wiki/Explosive_materialhttp://en.wikipedia.org/wiki/Explosive_materialhttp://en.wikipedia.org/wiki/Earthworks_(engineering)http://en.wikipedia.org/wiki/Traffichttp://en.wikipedia.org/wiki/Machinehttp://en.wikipedia.org/wiki/Oscillationhttp://en.wikipedia.org/wiki/Constructionhttp://en.wikipedia.org/wiki/Tillagehttp://en.wikipedia.org/wiki/Deforestation


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TYPES

A quick clay side killing


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Debris flow

- Slope material thatbecomes saturatedwith watermay developinto a debris flowor mud flow. Theresulting slurry of rockand mud may pick

up trees, houses and cars, thus blockingbridgesand tributariescausing floodingalong itspath.

- Debris flow is often mistaken for flashflood, but they are entirely differentprocesses.
http://en.wikipedia.org/wiki/Aquiferhttp://en.wikipedia.org/wiki/Debris_flowhttp://en.wikipedia.org/wiki/Debris_flowhttp://en.wikipedia.org/wiki/Aquiferhttp://en.wikipedia.org/wiki/Mudflowhttp://en.wikipedia.org/wiki/Debris_flowhttp://en.wikipedia.org/wiki/Rock_(geology)http://en.wikipedia.org/wiki/Rock_(geology)http://en.wikipedia.org/wiki/Mudflowhttp://en.wikipedia.org/wiki/Rock_(geology)http://en.wikipedia.org/wiki/Tributarieshttp://en.wikipedia.org/wiki/Tributarieshttp://en.wikipedia.org/wiki/Floodinghttp://en.wikipedia.org/wiki/Flash_floodhttp://en.wikipedia.org/wiki/Flash_floodhttp://en.wikipedia.org/wiki/Flash_floodhttp://en.wikipedia.org/wiki/Flash_floodhttp://en.wikipedia.org/wiki/Flash_floodhttp://en.wikipedia.org/wiki/Floodinghttp://en.wikipedia.org/wiki/Tributarieshttp://en.wikipedia.org/wiki/Rock_(geology)http://en.wikipedia.org/wiki/Mudflowhttp://en.wikipedia.org/wiki/Debris_flowhttp://en.wikipedia.org/wiki/Aquifer


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A rock slide


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Debris avalanche

- a type of slide characterized

by the chaotic movement of

rocks soil and debris mixed

with water or ice (or both).


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Deep-seated landslide

- Landslides in which the sliding surface is mostly deeply

located below the maximum rooting depth of trees(typically to depths greater than ten meters). Deep-seated landslides usually involve deep regolith,weathered rock, and/or bedrockand include large

slope failure associated with translational, rotational,or complex movement. These typically move slowly,only several meters per year, but occasionally movefaster. They tend to be larger than shallow landslidesand form along a plane of weakness such asa faultor bedding plane. They can be visually identifiedby concave scarpsat the top and steep areas at thetoe.
http://en.wikipedia.org/wiki/Regolithhttp://en.wikipedia.org/wiki/Bedrockhttp://en.wikipedia.org/wiki/Fault_(geology)http://en.wikipedia.org/wiki/Bedding_planehttp://en.wikipedia.org/wiki/Fault_scarphttp://en.wikipedia.org/wiki/Fault_scarphttp://en.wikipedia.org/wiki/Bedding_planehttp://en.wikipedia.org/wiki/Fault_(geology)http://en.wikipedia.org/wiki/Bedrockhttp://en.wikipedia.org/wiki/Regolith


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Landslide occurred in Malaysia

In 2004 Malaysia suffered the latest in a series

of landslide incidents when a large rockslope

failed and collapsed onto the New Klang Valley

Expressway (NKVE) on the edge of KualaLumpur at Bukit Lanjan. This remarkable

landslide, pictured below, closed the

motorway for many months,inducing hugecosts, although fortunately no-one was killed:


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Landslide at Simpang Pulai Stretch

- Looks like there are some minor landslidealong the Simpang Pulai stretch. Whenever it

rains, soil erosion occurs and when the ground

becomes liquefied, it won't be able to hold the

weight of the soil and landslide occurs.


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Danger up high

Friday August 12, 2011


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Presentation 2

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