https://orcid.org/0000-0003-3221-118X
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ABSTRACT
In the present study, pseudostatic method is used to analyse the stability of soil-nailed vertical wall under seismic conditions. This approach includes an additional inertial force equivalent to the dynamic load caused by earthquake. The soil surface which undergoes failure due to the static and dynamic condition is assumed to be a realistic composite failure surface rather than the conventional planar, circular or log-spiral surfaces. This study investigates the effect of various parameters such as vertical and horizontal seismic acceleration coefficients, friction angle of soil, shear wave velocity, primary wave velocity, amplification factor, nail length, spacing of the nails, and nail inclination on the stability of the vertical soil-nailed wall. A comparison study is made between the results obtained from the present analysis and the values reported in the literature. It is observed the present study with composite failure surface gives higher values of Factor of Safety compared to planar failure surface. Composite failure surface is more realistic and hence more accurate compared to a planar failure surface which gives a conservative value of Factor of Safety.
List of Notations
| φ | = | Soil friction angle |
| αh | = | Horizontal seismic acceleration coefficient |
| αv | = | Vertical seismic acceleration coefficient |
| fa | = | Amplification Factor |
| ϛp | = | Primary wave velocity |
| ϛs | = | Shear wave velocity |
| ξ,ξ1,ξ2 | = | Angles made by the composite failure surface |
| γ | = | Unit weight of the soil |
| Tp | = | Pullout resistance of the nail |
| d | = | Nail diameter |
| Lp | = | Length of the nail anchored beyond the failure surface |
| L | = | Length of the nail |
| Ψ | = | Dilatancy angle |
| i | = | Nail inclination with the horizontal |
| qu | = | Nominal bond strength at the interface of nail, grout and soil |
| Te | = | Equivalent tension force from the nail |
| R1 | = | Reaction force existing between the wedges LNP and LNQ |
| WLNP, WLNQ, WQNM | = | Weight of the wedges LNP, LNQ, QNM respectively |
| QLNP(h), QLNQ(h), QQNM(h) | = | Horizontal inertial force in the wedges LNP, LNQ, QNM respectively |
| QLNP(v), QLNQ(v), QQNM(v) | = | Vertical inertial force in the wedges LNP, LNQ, QNM respectively |
Disclosure statement
No potential conflict of interest was reported by the author(s).