Hydraulic characteristics of stabilised expansive subgrade soils in road pavements

Pooni, J.; Robert, Dilan; Giustozzi, Filippo; Gunasekara, Chamila; Setunge, Sujeeva; Venkatesan, Srikanth

doi:10.1080/10298436.2021.1883610

Cited by 11 publications

(6 citation statements)

References 64 publications

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“…Generally, the residual water content of the soil sample decreased with the increase of compactness because the high-density soil sample has few pores. Similar conclusions were drawn by Pooni et al (2021). In addition, according to the results in Table 5, the sum of the residual squares of the fitted data is greater than 99%, indicating that the Van-Genuchten model can effectively predict the SWCC of expansive soil.…”

Section: Swcc and Fitting Modelsupporting

confidence: 78%

“…It is widely accepted that matric suction plays an important role in mechanical properties of the unsaturated soil, including resilient modulus and shear strength (Yao et al, 2018). Pooni et al (2021) applied the dewpoint potentiometer to measure the hydraulic behavior and the results showed the hydraulic variation has strong influence on the stabilization for an expansive subgrade. Therefore, the SWCC features of expansive soil must be investigated to scientifically and effectively evaluate the stability of the expansive soil slope (Dai et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

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Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation

Yao

Xiao

et al. 2021

Front. Earth Sci.

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The creep deformation of expansive soil has been considered as a vital threat to the safety in engineering construction because it may cause serious slope diseases in geological engineering. Meanwhile, since expansive soil usually remains in unsaturated state, its mechanical property is significantly affected by the seasonal environment. Therefore, the nonlinear deformation of expansive soil has received increasing attention, especially the humidity-dependent creep properties. This study focused on the stability of the unsaturated expansive soil subgrade considering rainfall and the creep behavior. Pressure plate extractor and direct shear tests were performed to investigate the hydro-mechanical and creep characteristics of the unsaturated expansive soil. Both the Van-Genuchten and Burgers models were applied to analyze the test results and inserted into the numerical model of the slope under rainfall infiltration. Results show that the compaction degree and the stress state was closely related to the water holding capacity of the expansive soil. The nonlinearity of the creep behavior became increasingly obvious with the increase of time and the stress level. The safety factor of the slope decreased as the rainfall time increased, and the most dangerous slide of the slope moved toward the foot of the slope. Considering the long-term creep process, there was a period of rapid growth in horizontal displacement that is detrimental to the stability of the slope. Besides, the rainfall infiltration could accelerate the slope failure before and after this creep process.

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Section: Swcc and Fitting Modelsupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation

Yao

Xiao

et al. 2021

Front. Earth Sci.

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“…where F, force (N); m, objects mass (kg); v, objects velocity (m/s); d, stopping distance (m). The soil material was obtained from a Melbourne land excavation site, which was used as engineering fill/ subgrade material in other recent soil-based experiments at the laboratory (Karami et al, 2021;Pooni et al, 2020;Pooni et al, 2021). Pooni et al (2020) explains that the soil is classified as a lean clay with sand (CL) and has a target maximum dry density (MDD) and optimum moisture content (OMC) of 1.62 g/cm 3 and 22.9%, respectively.…”

Section: Test Set-up and Proceduresmentioning

confidence: 99%

Qualitative investigations into floodways under extreme flood loading

Greene,

Gunasekara,

Lokuge

et al. 2024

J Flood Risk Management

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The Australian use of the term floodway refers to a trafficable transverse structure designed to facilitate the safe crossing of watercourses. Floodways are also commonly referred to as fords and causeways. This research explores areas of focus through experimental, numerical and survey methods to improve floodway resilience with regard to flood risk management. The industry‐based survey provides a dataset relating to user experiences, deduces the likeliness of floodways to sustain damage, defines several key focus areas, and reveals that the current risk levels are primarily managed without significant investigation into design. A floodway experimental and numerical simulation program was developed to investigate the lateral forces induced through debris impact using scaled models in a soil box and finite element analysis. Qualitatively, crack propagation and displacement correlated closely with the strain concentrations and displacements in the numerical simulation, with failure attributed to tensile strength being exceeded, followed by plastic strain development within the soil elements. It was concluded through this research that floodway failure during flood is complex and can be attributed to several different failure modes including concrete failure, yielding of adjoining soil material, and hydraulically via scour.

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“…Additionally, in South Africa in 2011, around 35% of potential damage to structures was expected to occur by the action of expansive soil conditions ( 24 ). Moisture fluctuations are the primary cause of the propagation of distortion in pavements ( 22 ).…”

Section: Expansive Soilmentioning

confidence: 99%

“…Expansive soils exhibit swell–shrink behavior, and structures constructed on these soils are ruined, with estimated annual reparation costs of $15 billion in the U.S.A. and £150 million in the UK ( 22 ). The worth of annual damage is estimated to be twice that of other types of natural devastation collectively.…”

Section: Expansive Soilmentioning

confidence: 99%

Effect of Swelling Soil on Pavement Condition Index of Airport Runway Pavement

Miah

Chai

et al. 2022

Transportation Research Record: Journal of the Transportation R

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Swelling is one of the distresses that affect the pavement condition index (PCI) of airport runways. In northwest Queensland, swelling was observed in three different runways where sealed flexible pavement runways were deformed by the heaving of the expansive clay subgrades due to water intrusion. In the study, the trends of moisture content (MC) and corresponding swelling of these expansive soils were observed at different times. Subsequently, the PCI was calculated for the swelling of these runways using PAVER software. A correlation has been developed between swelling of different severity levels and the corresponding PCI. In addition, the relationship between MC and PCI has been established to demonstrate the influence of MC on the swell behavior, and the influence of seasonal MC variations on PCI was also examined. Finally, the study generated empirical equations to predict the swelling effects on the PCI and subsequent functional performance of the runway pavements constructed on expansive soils. A good correlation has been achieved between the swell parameter and the PCI. The correlation coefficient of determination R2 is computed to be 0.9981, 0.999, and 0.9987 for low, medium, and high severity of the swelling, respectively. The equations fitted with the experimental data well, which demonstrates the reliability of the empirical equations. From the result of swelling against MC and calculated PCI, it is evident that adverse effects are inevitable when water intrusion occurs in swelling soil subgrade. This high plasticity soil can deteriorate pavement performance and cause early pavement damage if allowed to swell.

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Hydraulic characteristics of stabilised expansive subgrade soils in road pavements

Cited by 11 publications

References 64 publications

Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation

Soil-Water Characteristics and Creep Deformation of Unsaturated Expansive Subgrade Soil: Experimental Test and Simulation

Qualitative investigations into floodways under extreme flood loading

Effect of Swelling Soil on Pavement Condition Index of Airport Runway Pavement

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