Interference of Square Footing on Layered Soil Subjected to vertical Load

Pusadkar, S. S.; Ninghot, K. R

doi:10.14445/23488352/ijce-v3i6p102

Cited by 2 publications

(2 citation statements)

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“…The results are generally shown that employing skirts improved the load-carrying capacity and decreased settlement for all loading cases because the skirts work to confine the soil below the footing and lead to making the foundation acts as a single part to transfer loads to great depths. In addition, the load-carrying capacity of unimproved and improved foundation with skirt is reduced with increasing eccentricity and loading angle for all cases which agrees with [5,8,[28][29][30][31]. Analysis of experimental results showed that the effect of positive eccentric-inclined loading on the reduction of soil-bearing capacity is more than negative eccentric-inclined loading for all cases due to the fact that the applied loading affects away from the center of the foundation and this agrees with the result of [29,32].…”

Section: Load Settlement Behaviorsupporting

confidence: 76%

Enhancing the ability of the square footing to resist positive and negative eccentric-inclined loading using an inclined skirt

Salah Alhalbusi,

Al-Saidi

2023

E3S Web Conf.

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Laboratory model tests were performed to investigate the behavior of shallow and inclined skirted foundations placed on sandy soil with R.D%=30 and the extent of the impact of the positive and negative eccentric-inclined loading effect on them. To achieve the experimental tests, it was used a box of (600×600) mm cross-sectional and 600mm in height and a square footing of (50*50) mm and 10 mm in thickness attached to the skirt with Ds=0.5B and various an angle of (10°, 20°, 30°). The results showed that using skirts leads to a significant improvement in load-carrying capacity and decreased settlement. In addition, when the skirt angle increased, the ultimate load improved. Load-carrying capacity decreased with increasing eccentricity and load inclination. For load inclination (Beta) 15° when the eccentricity changed from e=0.15B to e=0.05B, the load improvement percentages were (323.2 to 263%) and (214 to 220%). The settlement reduction factor was (83 to 78%) and (62 to 58%) for positive and negative eccentric-inclined loading, respectively. Also, the result showed that the positive effect on reducing soil-bearing capacity is more than the negative. Increasing eccentricity increases the improvement percentage for positive eccentric-inclined load and decreases for the case of negative eccentric-inclined load. Increased skirt angle will increase the Improvement factor (IR). When the skirt angle increased from 10° to 30° for an improved foundation with load angles of 5°, 10°, and 15°, the improvement factor (IR) increased from (2.53, 2.51, 2.4) to (3.45, 3.65, 3.97) and (2.43, 2.58, 2.54) to (4, 4.63, 5.3) for both negative and positive eccentric-inclined load respectively and settlement reduction factor for load angle 15° and skirt angle increase from 10° to 30° were 34% and 27% for positive and negative eccentric-inclined load respectively. The (IR) for the positive eccentric-inclined load is more than the negative eccentric-inclined load for all cases. In addition, the skirt angle of 30° significantly improved the improvement factor (IR).

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Section: Load Settlement Behaviorsupporting

confidence: 76%

Enhancing the ability of the square footing to resist positive and negative eccentric-inclined loading using an inclined skirt

Salah Alhalbusi,

Al-Saidi

2023

E3S Web Conf.

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“…The primary function of geogrids is to enhance soil engineering properties. Geogrid reinforcement has been increasingly applied in various geotechnical-engineering fields to strengthen bearing capacity and minimize soil settlement (Patra et al, 2005;Shrigondekar and Ullagaddi, 2021;Sitharam and Sireesh, 2004;Xu et al, 2019). Manohar and Anbazhagan (2021) reported that geosyntheticreinforced rubber-sand mixtures improved shear strength at a higher content of rubber.…”

Section: Introductionmentioning

confidence: 99%

Effect of Geogrid Reinforcement on Shear Strength Characteristics of a Rubber-Sand Mixture under Undrained Triaxial Test

Ansari¹,

Roy²

2023

JJCE

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Utilization of rubber-sand mixtures as construction materials, such as lightweight filling materials, embankment construction, seismic isolation materials, … etc., provides significant advantages, as scrap tires induce environmental issues. In this study, unconsolidated undrained triaxial tests were performed to examine the shear-strength characteristics of geogrid-reinforced sand-rubber mixtures. The rubber percent (10%, 20%, 30%, 40%, 50% and 60%), the confining pressure of the cell (19.6 kPa, 49 kPa and 98 kPa) and the number of geogrid reinforcements (1 to 4) were varied for investigating the impact of these parameters. The relative density of sand remained constant (80%) during the test. The test results were evaluated in terms of the stress-strain characteristics of rubber-sand mixtures. The test findings demonstrated that by increasing the confining pressure of the cell, the same rubber-sand mixtures with the same relative density and rubber content take more loads. The peak stress of unreinforced rubber-sand mixtures increased with the increasing proportion of rubber content up to 30%, beyond which it decreased as rubber content increased. Maximum peak stress and axial strain have been achieved with 50% of the rubber content and four layers of geogrid reinforcement. The brittleness index of the rubber-sand mixture reduces when geogrid reinforcement is added. The minimum brittleness was found to be 0.042 at 50% rubber content with three layers of geogrid reinforcement. KEYWORDS: Geogrid, Shear strength, Triaxial test, Rubber-sand mixture, Soil reinforcement.

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Interference of Square Footing on Layered Soil Subjected to vertical Load

Cited by 2 publications

References 0 publications

Enhancing the ability of the square footing to resist positive and negative eccentric-inclined loading using an inclined skirt

Enhancing the ability of the square footing to resist positive and negative eccentric-inclined loading using an inclined skirt

Effect of Geogrid Reinforcement on Shear Strength Characteristics of a Rubber-Sand Mixture under Undrained Triaxial Test

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