Interference effect of shallow foundations constructed on sand reinforced with geosynthetics

Ghazavi, Mahmoud; Lavasan, Arash Alimardani

doi:10.1016/j.geotexmem.2008.02.003

Cited by 145 publications

(37 citation statements)

References 28 publications

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“…In their study, the effects of boundaries and adjacent footings on each other were not considered due to the proximity of boundaries and footings [1]. Some studies showed that the adjacent footings placed on reinforced soil have a different load-settlement characteristic compared with single footings [14,21,22]. For the first time, in this study, using large loading plates, a more accurate estimation of the behavior of the full-scale footings supported on geocell-reinforced sand can be presented.…”

Section: Introductionmentioning

confidence: 96%

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

2018

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The scale effect on bearing capacity of shallow footings supported by unreinforced granular soils has been evaluated extensively. However, the subject has not been addressed for shallow footings on geocell-reinforced granular soils. In this study, load-settlement characteristic of large square footings is investigated by performing large-scale loading tests on unreinforced and geocell-reinforced granular soils. The effects of footing width (B), soil relative density of soil (Dr), and reinforcement depth (u) have been investigated. The test results show that the scale effects exist in geocell-reinforced soils, like unreinforced soils, and the behavior of small-scale models of footings cannot be directly related to the behavior of full-scale footings due to the difference between initial conditions of tests and the initial state of mean stresses in the soil beneath the footings having different dimensions. Large footings create higher mean stresses in the soil, resulting in low soil friction angle and initial conditions of the test approach to the critical state lines. The results of tests indicate that model experiments should be conducted on low-density soil for better prediction of the behavior of full-scale footings, otherwise, the predicted behavior of full-scale footings does not seem conservative.

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Section: Introductionmentioning

confidence: 96%

Scale Effects of Footings on Geocell Reinforced Sand Using Large-Scale Tests

2018

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“…Research on the interference effects of two closely spaced footing on reinforced sand indicates that sand reinforcement definitely improves the mechanical performance of the nearby footings. Ghazavi and Lavasan [2] studied the interference effect of shallow foundations constructed on sand reinforced with geosynthetics. They explored the role of contributing parameters on the interference factor, including the reinforcement location and the distance between the two close footings.…”

Section: Introductionmentioning

confidence: 99%

Mitigating the uneven settlement of nearby strip footings on loose saturated sand using concrete pedestals: a model test study

2018

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Adjacency and interfering of footings are a matter of importance in geotechnical engineering. Researchers have studied on the behavior of adjacent footings by several approaches, but the mechanism of such footings under unequal and non-simultaneous surcharges have not been explored to date. In this study, two series of experiments were conducted using small scale 1g models to investigate the behavior of the two adjacent footings under reinforced and unreinforced soil conditions. The footings were installed with different side-to-side spacing and placed on loose saturate sand. The ultimate bearing capacity, settlement, and tilting of footings are evaluated: (1) when the footings are rested on unreinforced sand; and, (2) when the soil underneath the new footing is reinforced by concrete pedestals. The results indicate that reinforcing the new footing by three concrete pedestals in the spacing to footing's width ratio (S/B) of 0 (i.e., two coherent footings) results in 67% increase of the bearing capacity of the new footing compared to that of the unreinforced condition. Also, the settlement and tilting of the old footing adjacent to the new footing decrease respectively up to 250% and 600% in comparison to those of the unreinforced condition. The proposed measure can be considered as an effective improvement technique on the performance of the nearby footings rested on soft granular soils.

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“…Reinforcement elements are placed in the soil in order to reduce the impact of adverse effects of freezethaw phenomenon on some of the engineering properties of fine-grained soils. In comparison with the studies on the compaction and strength characteristics of randomly reinforced cohesive soils [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], there are a limited number of studies on the freeze-thaw behaviour of fiber reinforced clays in the literature [14,29,34,35].…”

Section: Introductionmentioning

confidence: 99%