Model Plate-Load Tests on Collapsible Soil

Alawaji, H.

doi:10.1016/s1018-3639(18)30700-1

Cited by 10 publications

(2 citation statements)

References 13 publications

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“…The 2D modelling results in smaller values of settlement versus load when compared to 3D modelling. The ultimate bearing potential for each curve was determined from the intersection of the initial tangent with the steeper tangent [52]. As is known, the maximum stress that soil can support directly before shear failure is the ultimate bearing capacity.…”

Section: Effect Of Immersion On Load-settlement Curvesmentioning

confidence: 99%

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Elsawy

Lakhouit

2021

Indian Geotech J

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The main objective of the present study is to investigate and evaluate the geo-environmental characteristics of continental Sabkha soil. This type of soil is widespread throughout the world, especially in Saudi Arabia. For the current work, disturbed and undisturbed samples are extracted from a site in Tymaa, Saudi Arabia. The natural geotechnical properties are determined, and chemical analyses are performed. Modified compaction, California bearing ratio (CBR), direct shear, and potential collapse tests are conducted experimentally on the soil, with the obtained results indicating that Sabkha soil is poorly graded sand and contains high concentrations of salts, causing a corrosive environment. Therefore, reinforced concrete foundations of structures built on this type of soil should be protected. In the tests, the compacted samples induce high values of shear strength and CBR. However, the soaked Sabkha soils show very low values of shear strength parameters and CBR compared to those of non-soaked samples. Hence, Sabkha soil indicates collapsible behaviour when soaked in water, which is attributable to the weak salt bonds between the soil grains. Also carried out in this work are numerical simulations of a fuel tank resting on unsaturated and saturated Sabkha soil, utilizing 2D and 3D Plaxis programs. The numerical analyses results show that while unsaturated soil has good performance under tank loads, it collapses under the loads when soaked in water. These outcomes match experimental results. In the limit state, the raft foundation on saturated soil shows greater values of settlement and internal forces compared to those of the raft foundation prior to immersion. Hence, Sabkha soil requires treatment before being built on.

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Section: Effect Of Immersion On Load-settlement Curvesmentioning

confidence: 99%

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Elsawy

Lakhouit

2021

Indian Geotech J

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“…[ 34 ] work has utilised two concepts to evaluate the benefits of reinforced soil foundation, for example, the bearing capacity ratio (BCR) and settlement reduction ratio (SRR). BCR is defined as the ratio of the bearing capacity of the reinforced soil foundation to that of unreinforced soil foundation whereas SRR is defined as the ratio of the reduction in footing settlement based on reinforcement to the settlement of unreinforced soil foundation at a constant surface pressure [ 35 ]. BCR is given as: …”

Section: Introductionmentioning

confidence: 99%

Effectiveness of strip footing with geogrid reinforcement for different types of soils in Mosul, Iraq

et al. 2020

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The main cause of problematic soil failure under a certain load is due to low bearing capacity and excessive settlement. With a growing interest in employing shallow foundation to support heavy structures, it is important to study the soil improvement techniques. The technique of using geosynthetic reinforcement is commonly applied over the last few decades. This paper aims to determine the effect of using geogrid Tensar BX1500 on the bearing capacity and settlement of strip footing for different types of soils, namely Al-Hamedat, Ba’shiqah, and Al-Rashidia in Mosul, Iraq. The analysis of reinforced and unreinforced soil foundations was conducted numerically and analytically. A series of conditions were tested by varying the number (N) and the width (b) of the geogrid layers. The results showed that the geogrid could improve the footing’s bearing capacity and reduce settlement. The soil of the Al-Rashidia site was sandy and indicated better improvement than the other two sites’ soils (clayey soils). The optimum geogrid width (b) was five times the footing width (B), while no optimum geogrid number (N) was obtained. Finally, the numerical results of the ultimate bearing capacity were compared with the analytical results, and the comparison showed good agreement between both the analyses and the optimum range published in the literature. The significant findings reveal that the geogrid reinforcement may induce improvement to the soil foundation, however, not directly subject to the width and number of the geogrid alone. The varying soil properties and footing size also contribute to both BCR and SRR values supported by the improvement factor calculations. Hence, the output complemented the benefit of applying reinforced soil foundations effectively.

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Enhancing mechanical behaviors of collapsible soil using two biopolymers

Ayeldeen

Negm

El-Sawwaf

et al. 2017

Journal of Rock Mechanics and Geotechnical Engineering

185

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15This study aims to investigate the ability of using biopolymer (environmental friendly material) to enhance 16 the mechanical characterizations of collapsible soil. Two types of biopolymers were used in this study 17 (xanthan gum and guar gum) because of their stable behaviour under sever conditions and their availability 18 with reasonable prices. The experimental program focused on three major soil properties, which are; 19 compaction characterizations, collapsible potential and shear parameters, these three properties are 20 essential in any soil improvement process. Different biopolymer concentrations were used in this study and 21 the experimental program was performed at two curing periods (soon after mixing the soil with the 22 biopolymer and after one week curing time). shear parameters were measured for the treated specimens in 23 both soaked and unsoaked conditions, while a collapsible potential test was performed under different 24 mixing conditions (wet mix and dry mix). A numerical model was built to predict the behaviour of the 25 treated collapsible soil after and before inundation. The analysis of results indicated the ability of both 26 xanthan gum and guar gum to be used as soil improvement materials for collapsible soil treatment. The 27collapsible potential has been reduced significantly from 9% to 1% after mixing the soil with 2% 28 biopolymer concentration in the wet case. After one week curing period, the cohesion stress has been 29 increased from 8.5 to 105 kPa by increasing the xanthan gum concentration from zero to 2%, leading to 30 overall improvement in the soil shear strength. Also, it proved that the superiority of guar gum over 31 xanthan gum in improving the shear strength is about 30% more than xanthan gum at the same conditions 32 and reduces the collapsible potential by about 20% more than xanthan gum at the same conditions. 33 34 35

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Model Plate-Load Tests on Collapsible Soil

Cited by 10 publications

References 13 publications

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Geotechnical Behaviour of Sandy Sabkha Soils Based on Experimental and Numerical Investigations

Effectiveness of strip footing with geogrid reinforcement for different types of soils in Mosul, Iraq

Enhancing mechanical behaviors of collapsible soil using two biopolymers

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