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NEW TECHNIQUES OF EROSION CONTROLS ON HILL ROADS GUIDED BY LECT. MANJU.P.M DEPARTMENT OF CIVIL ENGINEERING PRESENTED BY Lekshmi priya.m S7,CIVIL ENGG Roll Number:31

INTRODUCTION Transportation contributes all round development of a country and hence plays a vital rate towards its progress. If the highways are not properly located and may contribute sediments to streams. The control of soil and water is basic to the protection of the road structure and therefore highway design, construction and maintenance must be continually evaluated to minimize erosion and sedimentation problems

MECHANISM OF SURFACE EROSION Rain drops hit the slope surface Impact of raindrop detaches the particle of soil The runoff water flowing on slope surface transports the detached particle and may also contribute to further detachment

TYPES OF EROSION WIND EROSION RAIN EROSION

WIND EROSION Exposed slope of non-cohesive loose and dry soil Lack of shelter from wind Exposed surface with out any protection

FACTORS CONTROLLING WIND EROSION Wind velocity Particle size of the material exposed to wind Moisture content of soil Vegetative cover

RAIN EROSION Rain erosion is phenomenon of transporting of soil particle due to water action, the influencing factors for rain water erosion are Potential of flowing water for initiating particle detachment Physical features ie topography, gradient, embankment slope etc Soil erodibility governed by clay content, particle size distribution, compaction , permeability, shear strength parameters etc of the soil

OBJECTIVES OF EROSION CONTROL To prevent damage to land adjacent to the road structure To reduce the soil loss from the land width of road, which silts up drainage channel and pollute rivers To contribute to the improvement of the aesthetics of the landscape To protect and preserve the earth work of fill or cut slope, ditches and drainage structure

EROSION CONTROL SYSTEM TRADITION/ CONVENTIONAL METHODS Agronomic method Non-agronomic method NEW TECHNIQUES –ENGINEER INOVATION Reinforced vegetation Coir geotextiles

AGRONOMIC METHOD Simple vegetative trufing Mulching of slope

NON AGRONOMIC METHOD Proper road side drainage system Soil cement stabilization Provision of aprons

REINFORCED VEGETATION Reinforced vegetation by using geo-textiles & other materials improving slop stability Synthetics jute & coir used as geo-textiles Geo-textiles are used for engineering applications due to their long life Disadvantage is that it causes air and water pollution while their non biodegradibility is responsible for increasing soil pollution

COIR GEOTEXTILES Made from coconut fiber extracted from the husk of the coconut fruit It is a biodegradable organic fibre material containing cellulose and lignin It gives max protection to the soil

SOME NEW TRENDS SILT FENCE CURLEX QUICK GRASS STEEL GROUND STAPLES DE WITT PROSPUN LANDSCAPE FABRIC POLYPROPYLENE SAND BAGS

SILT FENCE Durable Light weight Easy to use

CULEX QUICK GRASS

STEEL GROUND STAPLES Use to anchor your landscape fabrics Each measures 6”L X 1” W

DeWitt pros pun Landscape Fabric Capability to stop weed growth Environmentally safe Easy to use

POLYPROPYLENE SAND BAGS White poly-string tie bags are made of woven Polypropylene String is attached to the bag. Each bag Measures 14” W X 26” L

CONCLUSION In all new construction erosion levels should be assessed in advance and appropriate protection measures are incorpoated in design. In case of existing structures facing erosion problems, both short term and long term measures should be considered to ensure stability. For overall economy use of locally available materials should be the first choice. In extreme climatic conditions polymeric grids with root reinforcing mechanism may be used even though they are costly

REFERENCE Azeem A and Ali A (1992) Erosion causes and control techniques for slopes of banks and cuttings, proceeding Indian geotecnical conference 1992 ,pp;457-462 Indian highways vol 32 no:6 jane 2004 Coir –organic fibre geotextiles for soil erosion control –by coir board of India

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