SOIL NAILINGSOIL NAILING

Dr. A.K.ChaudharyDr. A.K.ChaudharyAssistant ProfessorAssistant Professor

Department of Civil Engineering, Department of Civil Engineering, NIT, JamshedpurNIT, Jamshedpur

INTRODUCTIONINTRODUCTION

Soil nailing is a technique used to Soil nailing is a technique used to reinforce and strengthen existing reinforce and strengthen existing groundground

Soil nailing consists of installing Soil nailing consists of installing closely spaced bars into a slope or closely spaced bars into a slope or excavation as construction proceeds excavation as construction proceeds from top downfrom top down

The grouted nails increases shear The grouted nails increases shear strength of overall soil mass.strength of overall soil mass.

TYPES OF SOIL NAILTYPES OF SOIL NAIL

Screw anchor soil nailScrew anchor soil nailGrouted soil nailGrouted soil nail

PROCEDURE OF SOIL NAILING PROCEDURE OF SOIL NAILING

Excavate small cutExcavate small cutDrill hole for nailDrill hole for nailInstall & grout nailInstall & grout nailPlace drainage strips, initial shotcrete Place drainage strips, initial shotcrete

layer & install bearing plateslayer & install bearing platesRepeat process to final gradeRepeat process to final gradePlace final facing on permanent wallsPlace final facing on permanent walls

IDEAL CONDITIONS FOR SOIL IDEAL CONDITIONS FOR SOIL NAILINGNAILING

Height of excavationHeight of excavationExcavation Face InclinationExcavation Face InclinationType of soilType of soilNail lengthNail lengthNail inclinationNail inclinationNail diameterNail diameterGrouted hole diameterGrouted hole diameter

APPLICATIONS APPLICATIONS

Landslide RemediationLandslide RemediationRailway embankmentsRailway embankmentsRoadway widening under existing Roadway widening under existing

bridgesbridgesStabilizing of existing retaining wallsStabilizing of existing retaining wallsHighway embankments and cuttingsHighway embankments and cuttings

ADVANTAGESADVANTAGES

CostCostTimeTimeApplicable in almost all type of soilsApplicable in almost all type of soilsConstruction equipmentsConstruction equipmentsPerformancePerformanceConstruction flexibilityConstruction flexibilityEnvironmental and aesthetic Environmental and aesthetic

considerationsconsiderations

LIMITATIONSLIMITATIONS

Temporary stand-up timeTemporary stand-up timeExcavation below the water levelExcavation below the water levelExcavation in soft clay.Excavation in soft clay.

COMPARATIVE STUDY OF SOIL COMPARATIVE STUDY OF SOIL NAILING AND REINFORCED NAILING AND REINFORCED SOILSOILSoil propertiesSoil propertiesMethod of installing reinforcing Method of installing reinforcing

elementselementsConstruction processConstruction processFacingFacingInclination of reinforcing elementsInclination of reinforcing elements

DESIGN STEPSDESIGN STEPS

Feasibility AssessmentFeasibility AssessmentInternal stabilityInternal stabilityExternal stabilityExternal stability

TYPICAL CROSS SECTION OF TYPICAL CROSS SECTION OF SOIL NAILED WALLSOIL NAILED WALL

CONCLUSIONCONCLUSION

Soil nailing is a potential solution of Soil nailing is a potential solution of landslide problems as it is landslide problems as it is economical and also applicable in economical and also applicable in seismic zones.seismic zones.

It can solve the problem of It can solve the problem of residential area up to a great extent.residential area up to a great extent.

It can be used in wide soil types.It can be used in wide soil types.

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