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Geomechanics and Engineering Volume 32, Number 2, January25 2023 , pages 209-232 DOI: https://doi.org/10.12989/gae.2023.32.2.209 |
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Investigation on economical method of foundation construction on soft soils in seismic zones: A case study in southern Iran |
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Javad Jalili, Farajdollah Askari, Ebrahim Haghshenas and Azadeh Marghaiezadeh
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| Abstract | ||
| A comprehensive study was conducted to design economical foundations for a number of buildings on soft cohesive soil in the southern coastal regions of Iran. Both static and seismic loads were considered in the design process. Cyclic experiments indicated that the cohesive soil of the area has potential for softening. Consequently, the major challenge in the design stages was relatively high dimensions of settlement, under both static and seismic loadings. Routine soil-improvement methods were too costly for the vast area of the project. After detailed numerical modeling of different scenarios, we concluded that, in following a performance-based design approach and applying a special time schedule of construction, most of the settlement would dissipate during the construction of the buildings. Making the foundation as rigid as possible was another way to prevent any probable differential settlement. Stiff subgrade of stone and lime mortar under the grid foundation and a reinforced concrete slab on the foundation were considered as appropriate to this effect. In favor of an economical design, in case the design earthquake strikes the site, the estimations indicate no collapse of the buildings even if considerable uniform settlements may occur. This is a considerable alternative design to costly soil-improvement methods. | ||
| Key Words | ||
| compressible soil; cyclic softening; dynamic numerical analysis; grid foundation; performance-based design; rigid foundation; soil improvement | ||
| Address | ||
| Javad Jalili, Farajdollah Askari, Ebrahim Haghshenas and Azadeh Marghaiezadeh: International Institute of Earthquake Engineering and Seismology, No.21, Arghavan St., Northern Dibaji St., Lavasani Ave., Tehran 19395/3913, Iran | ||