Investigation of Deflection of a Laterally Loaded Pile and Soil Deformation Using the PIV Technique

Yuan, Bingxiang; Xu, Kun; Wang, Yixian; Chen, Rui; Luo, Qingzi

doi:10.1061/(asce)gm.1943-5622.0000842

Cited by 63 publications

(21 citation statements)

References 28 publications

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“…To remedy this reduced plasticity, both synthetic and natural fibers have been added to lime-stabilized soil [49,50]. Although the beneficial role of a combination of lime stabilization and fiber reinforcement is an established concept [51][52][53][54][55][56], the coupling effect of them with regard to magnitude and microstructural mechanisms is not well understood, especially for natural fibers with special microstructures such as coir and wheat straw.Wheat straw is an abundantly produced agricultural residue of which disposal by burning results in large amounts of air pollutants. An alternative way to dispose of wheat straw is utilization of it for soil reinforcement.…”

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confidence: 99%

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Wang

Guo

et al. 2019

Applied Sciences

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The beneficial role of combining fiber reinforcement with lime stabilization in altering soil behavior has been established in the literature. However, the coupling effect of their combination still remains unclear in terms of its magnitude and microscopic mechanism, especially for natural fibers with special microstructures. The objective of this study was to investigate the coupling effect of wheat straw fiber reinforcement and lime stabilization on the mechanical behavior of Hefei clayey soil. To achieve this, an experimental program including unconsolidated–undrained (UU) triaxial tests and SEM analysis was implemented. Static compaction test samples were prepared on untreated soil, fiber-reinforced soil, lime-stabilized soil, and lime-stabilized/fiber-reinforced soil at optimum moisture content with determining of the maximum dry density of the untreated soil. The lime was added in three different contents of 2%, 4%, and 6%, and 13 mm long wheat straw fiber slices with a cross section one-quarter that of the intact ones were mixed in at 0.2%, 0.4%, and 0.6% by dry weight of soil. Analysis of the derived results indicated that the addition of a small amount of wheat straw fibers into lime-stabilized soil improved the intensity of the strain-softening behavior associated with mere lime stabilization. The observed evidence that the shear strength increase brought by a combination of 0.4% fiber reinforcement and 4% lime stabilization was smaller than the summation of the shear strength increases brought by their presence alone in a sample demonstrated a coupling effect between fiber reinforcement and lime stabilization. This coupling effect was also detected in the comparisons of the secant modulus and failure pattern between the combined treatment and the individual treatments. These manifestations of the coupling effect were explained by a microscopic mechanism wherein the fiber reinforcing effect was made more effective by the ways in which lime chemically stabilized the soil and lime stabilization development was quickened by the water channels passing through the surfaces and honeycomb pores of the wheat straw fibers.

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confidence: 99%

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Wang

Guo

et al. 2019

Applied Sciences

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“…where is the internal friction angle in soil. (4) In the range of embedding depth of foundation, the friction between the foundation and soil and the shear strength of the soil on both sides of the foundation are not taken into account, and the weight of the buried soil on both sides is simplified as overloading.…”

Section: 1mentioning

confidence: 99%

“…As one of the classical stability problems in soils mechanical, the foundation bearing capacity has always been the focus of scholars and engineers. In recent years, many scholars have devoted themselves to the ultimate bearing capacity and deformation of pile foundations [2][3][4]. In permafrost regions, shallow and deep foundation are the two commonly used types.…”

Section: Introductionmentioning

confidence: 99%

Ultimate bearing capacity of circular shallow foundations in frozen clay

Liu¹,

Yao²,

Shang³

2019

J. vibroeng.

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This paper presents a study on the ultimate bearing capacity of circular shallow foundation in frozen clay. The bearing capacity were determined by model test, numerical simulation and analytical solution. In numerical simulation, the temperature field considering the phase transition was transformed into a temperature load and applied to a three-dimensional solid model. The generalized Kelvin model was used to describe the creep of frozen clay, and step loading was used. Based on the tests results that frozen soil fails because of local shear, we proposed an analytical model to estimate the ultimate bearing capacity of circular shallow foundation with local shear failure mechanisms. Based on the limit equilibrium theory, it was assumed that the fracture plane of the model only develops to the boundary between the transition zone and the passive zone. The results from present study and some other method are presented and compared, which has shown and verified the feasibility of our method. And the analytical solution is in good consistent with the results of the model test and numerical simulation.

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“…For a long time, many scholars at home and abroad have deeply explored the main factors affecting the resilient modulus of subgrade soil and established many prediction models, based on different factors, such as stress state and basic physical properties of soil [42][43][44][45][46][47]. According to the different stress variables, prediction models can be divided into three categories: Single factor model related to mass stress, a composite model related to shear stress and mass stress, and a composite model related to shear stress and confining pressure [48][49][50][51][52][53][54][55][56][57][58][59][60]. However, most of existing prediction models only consider the influence of stress state on the resilient modulus [42], and rarely consider the influence of compactness, moisture content, and additive content.…”

Section: Introductionmentioning

confidence: 99%

Resilient Modulus—Physical Parameters Relationship of Improved Red Clay by Dynamic Tri-Axial Test

Yuan

Wang

et al. 2019

Applied Sciences

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As one of the important parameters used in the analysis and design of subgrade, resilient modulus is directly related to the safety, economic and life time of subgrade structure. In this paper, the characteristics of resilient modulus of improved red clay at different additive content were studied through conducting laboratory repeated load tri-axial tests. The influence of stress state, moisture content, compactness, additive types, and content on resilient modulus were analyzed. In addition, the regression analysis of resilient modulus, was carried out referencing three existing prediction models. The results showed that the Andrei model can better fit the resilient modulus of red clay and have a higher determination coefficient. However, the Andrei model and other existing prediction models, reflect only the influence of stress state on resilient modulus, without considering the influence of moisture content, compactness and additive content. Therefore, based on the Andrei model, a comprehensive prediction model, which can reflect the influence of compactness, moisture content, additive content, and stress state on resilient modulus was introduced. Good agreement between the regression results and the measured ones demonstrated the integrative ability of the introduced model.

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Investigation of Deflection of a Laterally Loaded Pile and Soil Deformation Using the PIV Technique

Cited by 63 publications

References 28 publications

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Behavior of Fiber-Reinforced and Lime-Stabilized Clayey Soil in Triaxial Tests

Ultimate bearing capacity of circular shallow foundations in frozen clay

Resilient Modulus—Physical Parameters Relationship of Improved Red Clay by Dynamic Tri-Axial Test

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