New Techniques of Erosion Controls on Hill Roads[ a v Shinde]
-
Upload
santosh11111 -
Category
Documents
-
view
155 -
download
12
Transcript of New Techniques of Erosion Controls on Hill Roads[ a v Shinde]
WELCOMEWELCOME
NEW TECHNIQUES OF NEW TECHNIQUES OF EROSION CONTROLS ON HILL EROSION CONTROLS ON HILL
ROADSROADS
GUIDED BY
LECT. MANJU.P.MDEPARTMENT OF CIVIL ENGINEERING
PRESENTED BY
Lekshmi priya.mS7,CIVIL ENGGRoll Number:31
INTRODUCTIONINTRODUCTION
Transportation contributes all round Transportation contributes all round development of a country and hence development of a country and hence plays a vital rate towards its progress. If plays a vital rate towards its progress. If the highways are not properly located the highways are not properly located and may contribute sediments to and may contribute sediments to streams. The control of soil and water streams. The control of soil and water is basic to the protection of the road is basic to the protection of the road structure and therefore highway design, structure and therefore highway design, construction and maintenance must be construction and maintenance must be continually evaluated to minimize continually evaluated to minimize erosion and sedimentation problemserosion and sedimentation problems
MECHANISM OF SURFACE MECHANISM OF SURFACE EROSIONEROSION
Rain drops hit the slope surfaceRain drops hit the slope surface
Impact of raindrop detaches the Impact of raindrop detaches the particle of soilparticle of soil
The runoff water flowing on slope The runoff water flowing on slope surface transports the detached surface transports the detached particle and may also contribute particle and may also contribute to furtherto further detachmentdetachment
TYPES OF EROSIONTYPES OF EROSION
WIND EROSIONWIND EROSION
RAIN EROSIONRAIN EROSION
WIND EROSIONWIND EROSION
Exposed slope of non-Exposed slope of non-cohesive loose and dry soilcohesive loose and dry soil
Lack of shelter from windLack of shelter from wind
Exposed surface with out any Exposed surface with out any protectionprotection
FACTORS CONTROLLING FACTORS CONTROLLING WIND EROSIONWIND EROSION
Wind velocityWind velocity
Particle size of the material exposed Particle size of the material exposed to windto wind
Moisture content of soilMoisture content of soil
Vegetative coverVegetative cover
RAIN EROSIONRAIN EROSIONRain erosion is phenomenon of transporting of Rain erosion is phenomenon of transporting of soil particle due to water action, the influencing soil particle due to water action, the influencing factors for rain water erosion arefactors for rain water erosion are
Potential of flowing water for initiating particle Potential of flowing water for initiating particle detachment detachment
Physical features ie topography, gradient, Physical features ie topography, gradient, embankment slope etcembankment slope etc
Soil erodibility governed by clay content, particle Soil erodibility governed by clay content, particle size distribution, compaction , permeability, shear size distribution, compaction , permeability, shear strength parameters etc of the soil strength parameters etc of the soil
OBJECTIVES OF EROSION OBJECTIVES OF EROSION CONTROLCONTROL
To prevent damage to land adjacent to To prevent damage to land adjacent to the road structurethe road structure
To reduce the soil loss from the land To reduce the soil loss from the land width of road, which silts up drainage width of road, which silts up drainage channel and pollute riverschannel and pollute rivers
To contribute to the improvement of the To contribute to the improvement of the aesthetics of the landscapeaesthetics of the landscape
To protect and preserve the earth work of To protect and preserve the earth work of fill or cut slope, ditches and drainage fill or cut slope, ditches and drainage structurestructure
EROSION CONTROL SYSTEMEROSION CONTROL SYSTEM
TRADITION/ CONVENTIONAL TRADITION/ CONVENTIONAL METHODSMETHODS
Agronomic methodAgronomic methodNon-agronomic methodNon-agronomic methodNEW TECHNIQUES –ENGINEER NEW TECHNIQUES –ENGINEER INOVATIONINOVATION
Reinforced vegetationReinforced vegetationCoir geotextilesCoir geotextiles
AGRONOMIC METHODAGRONOMIC METHOD
Simple vegetative Simple vegetative trufingtrufing
Mulching of slopeMulching of slope
NON AGRONOMIC METHODNON AGRONOMIC METHOD
Proper road side drainage Proper road side drainage systemsystem
Soil cement stabilizationSoil cement stabilization
Provision of apronsProvision of aprons
REINFORCED VEGETATIONREINFORCED VEGETATIONReinforced vegetation by using geo-textiles Reinforced vegetation by using geo-textiles & other materials improving slop stability& other materials improving slop stability
Synthetics jute & coir used as geo-textilesSynthetics jute & coir used as geo-textiles
Geo-textiles are used for engineering Geo-textiles are used for engineering applications due to their long lifeapplications due to their long life
Disadvantage is that it causes air and water Disadvantage is that it causes air and water pollution while their non biodegradibility is pollution while their non biodegradibility is responsible for increasing soil pollutionresponsible for increasing soil pollution
COIR GEOTEXTILESCOIR GEOTEXTILESMade from coconut fiber extracted Made from coconut fiber extracted from the husk of the coconut fruitfrom the husk of the coconut fruit
It is a biodegradable organic fibre It is a biodegradable organic fibre material containing cellulose and material containing cellulose and ligninlignin
It gives max protection to the soilIt gives max protection to the soil
SOME NEW TRENDSSOME NEW TRENDS
SILT FENCESILT FENCE
CURLEX QUICK GRASSCURLEX QUICK GRASS
STEEL GROUND STAPLESSTEEL GROUND STAPLES
DE WITT PROSPUN DE WITT PROSPUN LANDSCAPE FABRICLANDSCAPE FABRIC
POLYPROPYLENE SAND BAGSPOLYPROPYLENE SAND BAGS
SILT FENCESILT FENCEDurableDurable
Light weightLight weight
Easy to useEasy to use
CULEX QUICK GRASSCULEX QUICK GRASS
STEEL GROUND STEEL GROUND STAPLESSTAPLES
Use to anchor your landscape fabricsUse to anchor your landscape fabrics
Each measures 6”L X 1” WEach measures 6”L X 1” W
DeWitt pros pun DeWitt pros pun Landscape FabricLandscape Fabric
Capability to Capability to stop weed stop weed growthgrowth
Environmentally Environmentally safesafe
Easy to useEasy to use
POLYPROPYLENE SAND POLYPROPYLENE SAND BAGSBAGS
White poly-stringWhite poly-stringtie bags are tie bags are made of wovenmade of wovenPolypropylenePolypropyleneString is String is attached toattached tothe bag.the bag.Each bagEach bagMeasuresMeasures14” W X 26” L14” W X 26” L
CONCLUSIONCONCLUSION In all new construction erosion levels In all new construction erosion levels
should be assessed in advance and should be assessed in advance and appropriate protection measures are appropriate protection measures are incorpoated in design.incorpoated in design.
In case of existing structures facing In case of existing structures facing erosion problems, both short term and erosion problems, both short term and long term measures should be considered long term measures should be considered to ensure stability. For overall economy to ensure stability. For overall economy use of locally available materials should be use of locally available materials should be the first choice. In extreme climatic the first choice. In extreme climatic conditions polymeric grids with root conditions polymeric grids with root reinforcing mechanism may be used even reinforcing mechanism may be used even though they are costlythough they are costly
REFERENCEREFERENCEAzeem A and Ali A (1992) Erosion causes Azeem A and Ali A (1992) Erosion causes and control techniques for slopes of banks and control techniques for slopes of banks and cuttings, proceeding Indian and cuttings, proceeding Indian geotecnical conference 1992 ,pp;457-462geotecnical conference 1992 ,pp;457-462
Indian highways vol 32 no:6 jane 2004Indian highways vol 32 no:6 jane 2004
Coir –organic fibre geotextiles for soil Coir –organic fibre geotextiles for soil erosion control –by coir board of Indiaerosion control –by coir board of India
THANKYOUTHANKYOU