INTRODUCTION
Slope failure – downward movement of soil ØShear stresses > Shear strength ØShear strength is the function of cohesion & internal friction >
Slope stability – represented in terms of factor of safety ØSafety factor = Resisting force / Driving force ØIf FOS > 1, then safe or stable slope Ø If FOS < 1, then unsafe or unstable slope
LEM – Based on static equation of forces Ø Soil mass above the slip surface is divided into slices Ø Shear & normal inter slice forces are determined v
FEM – Based on the concept of stress strain relationship ØStructure is divided into smaller elements called finite elements ØProperties of these elements are formulated & combined to obtain solution for the entire structure
AIM
ÒSlope stability analysis using LEM & FEM methods
SCOPE
Soil nailing provides: ÒHigh durability, reduced maintenance cost and highly resistant against environmental influences ÒImproved infrastructure in terms of speed & ease of construction, economy, aesthetics etc. ÒIncreased interaction with soil ÒControl erosion and landslides
OBJECTIVES
ÒSlope stability analysis using Swedish Circle Method ÒFEM model study using PLAXIS 2D ÒVerification of effect of nail length, nail inclination, nail configuration and spacing of nails
STABILITY ANALYSIS – SWEDISH CIRCLE METHOD
Procedure v\
Draw the slip surface vTo locate the most critical circle, Fellenius line AB
is drawn vTo draw Fellinius line AB, B is located at a depth H and at a
distance 4.5H from point P at toe of the slope
SCOPE FOR FUTURE WORK
ÒEffect of water table
ÒEffect of seepage conditions
ÒEffect of dynamic load
CONCLUSION
FOS was calculated for both slopes using LEM & FEM
FOS for site 1 using Swedish circle method and PLAXIS
2D method are 0.895 and 0.79
FOS for site 2 using Swedish circle method and PLAXIS
2D method are 0.61 and 0.6
Ò
Obtained results in PLAXIS and Swedish circle method are comparable
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