Abstract
A new method is proposed to evaluate the seismic stability of a rigid retaining wall undergoing translation or rotational failure. In the present method, strain-dependent dynamic properties are used to assess the seismic stability of rigid retaining walls against sliding and overturning failure conditions. The effect of foundation soil properties on the stability of retaining walls is also considered. From the parametric study, it is observed that the foundation soil properties have a significant effect on both sliding and rotational stability of rigid retaining walls. This can be attributed to the use of strain-dependent dynamic properties and the consideration of foundation soil properties. The predictions of the proposed method are compared and verified against the results from other methods proposed in the past. The percentage increase in the results compared to the existing literature is a maximum of 10 and 28% for rigid (bedrock) and flexible (sand deposit) foundation, respectively.
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Abbreviations
- ah, ahf, ahw :
-
Horizontal seismic acceleration in the backfill, foundation and wall, respectively
- b :
-
b w /H
- b w :
-
Top width of the retaining wall
- CI, CIE(t):
-
Static and seismic wall inertia factors
- CR, CRD(t):
-
Static and seismic wall rotational factors
- Db, Df, Dw :
-
Damping Ratio of the backfill soil, foundation soil and wall material respectively
- Fb, Nb :
-
Horizontal and vertical components of reaction on the base of the wall
- FT, FI, FR :
-
Soil active thrust, wall inertia and wall rotational factor, respectively
- FWS, FWR :
-
Combined dynamic factor against sliding and rotational failures, respectively
- g :
-
Acceleration due to gravity
- H, Hf :
-
Height of the retaining wall and foundation depth, respectively
- Ka, Kae (t):
-
Static and seismic active earth pressure coefficients
- \(k^{*} , k_{f}^{*}\) :
-
Complex wave number of the backfill material and foundation soil, respectively
- k h :
-
Horizontal seismic acceleration coefficient at the bedrock
- ms (z), mw (z):
-
Elemental mass of the soil wedge and wall, respectively
- Pae (t):
-
Total active earth thrust
- Qhb (t), Qhw (t):
-
Horizontal inertia forces acting in the failure wedge and wall, respectively
- r c :
-
Radial distance between the centroid of the wall and rotation centre E
- t :
-
Time
- T :
-
Period of lateral shaking
- u hb :
-
Displacement in the bedrock
- uh, uhf :
-
Horizontal displacement in the backfill and foundation soil, respectively
- Vs, Vsf, Vsw :
-
Shear wave velocity of the backfill, foundation soil and wall material, respectively
- W w :
-
Weight of the wall
- Wws, static, Wwr, static :
-
Weight of the wall required for equilibrium against sliding and rotational failure under static conditions, respectively
- Wws (t), Wwr (t):
-
Weight of the wall required for equilibrium against sliding and rotational failure under seismic conditions, respectively
- W s :
-
Weight of the failure wedge
- z, zf :
-
Depth from the top of the wall or backfill and foundation layer, respectively
- α :
-
Angle of the failure plane with respect to horizontal
- γs, γsf :
-
Shear strain in the backfill and foundation soil, respectively
- γb, γf, γw :
-
Unit weight of the backfill, foundation soil and wall material, respectively
- ρb, ρf :
-
Mass density of the backfill and foundation soil, respectively
- δ :
-
Wall friction angle
- \(\eta_{0}\) :
-
Angle of inclination of radial distance between centroid and rotation centre, E with horizontal
- θ :
-
Wall inclination angle
- ϕ :
-
Soil friction angle
- ϕ b :
-
Wall base friction angle
- ω :
-
Angular frequency of motion = 2π/T
- λ :
-
Impedance ratio
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Nimbalkar, S., Pain, A. & Annapareddy, V.S.R. A Strain Dependent Approach for Seismic Stability Assessment of Rigid Retaining Wall. Geotech Geol Eng 38, 6041–6055 (2020). https://doi.org/10.1007/s10706-020-01412-4
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DOI: https://doi.org/10.1007/s10706-020-01412-4