The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform
Biqing Sheng - One of the best experts on this subject based on the ideXlab platform.
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Developing Correlation Relationship Between Modulus of Subgrade Reaction and Resilient Modulus for Florida Subgrade Soils
Transportation Research Record, 2011Co-Authors: W. Virgil Ping, Biqing ShengAbstract:The resilient modulus of pavement Subgrade is an essential parameter for mechanistically based pavement design procedures; the modulus of Subgrade Reaction (k) is used as a primary parameter for rigid pavement design. The AASHTO pavement design guide (1986, 1993) suggested a theoretical relationship between modulus of Subgrade Reaction and resilient modulus of Subgrade based on the assumption that the Subgrade material is linear elastic. This paper presents an experimental study to evaluate the load-deformation and resilient modulus characteristics of the granular Subgrade soils with the use of field and laboratory tests. An extensive field static plate bearing load testing program was conducted to evaluate the in situ bearing characteristics of typical Florida pavement Subgrade soils. A full-scale laboratory evaluation of the Subgrade performance was conducted in a test-pit facility that simulated the actual field conditions. A laboratory triaxial test was performed to evaluate the resilient modulus char...
Anirban Basudhar - One of the best experts on this subject based on the ideXlab platform.
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Treatise on Winkler Modulus of Subgrade Reaction and Its Estimation for Improved Soil–Structure Interaction Analysis
Geotechnical and Geological Engineering, 2018Co-Authors: Prabir Kumar Basudhar, Susheel Kumar Yadav, Anirban BasudharAbstract:The paper pertains to the development of a new relationship expressing the Winkler modulus of Subgrade Reaction as a function of elastic parameters such as the modulus of elasticity and Poisson’s ratio of the foundation soil, and the relative rigidity of the foundation soil and the beam resting over the same. It ensures that the maximum values of beam deflection and bending moment computed by using both the theory of elastic continuum and lumped parameter modeling are either identical or very close to each other. In this respect the developed expression can be construed to be superior to those proposed by Biot and Vesic, which respectively predict correct values for only one of the quantities (either maximum bending moment or maximum deflection). In addition, the proposed model for Subgrade modulus is applicable to multiple load conditions as well unlike the other two approaches as reported.
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treatise on winkler modulus of Subgrade Reaction and its estimation for improved soil structure interaction analysis
Geotechnical and Geological Engineering, 2018Co-Authors: Prabir Kumar Basudhar, Susheel Kumar Yadav, Anirban BasudharAbstract:The paper pertains to the development of a new relationship expressing the Winkler modulus of Subgrade Reaction as a function of elastic parameters such as the modulus of elasticity and Poisson’s ratio of the foundation soil, and the relative rigidity of the foundation soil and the beam resting over the same. It ensures that the maximum values of beam deflection and bending moment computed by using both the theory of elastic continuum and lumped parameter modeling are either identical or very close to each other. In this respect the developed expression can be construed to be superior to those proposed by Biot and Vesic, which respectively predict correct values for only one of the quantities (either maximum bending moment or maximum deflection). In addition, the proposed model for Subgrade modulus is applicable to multiple load conditions as well unlike the other two approaches as reported.
Yu Jian-lin - One of the best experts on this subject based on the ideXlab platform.
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Semi-analytical solutions for single piles subjected to combined vertical and lateral loads by Subgrade Reaction method
Journal of the Harbin Institute of Technology, 2011Co-Authors: Yu Jian-linAbstract:To intensively study the responses of single piles under combined vertical and lateral loads,the common form of the coefficient of Subgrade Reaction was introduced.The semi-analytical solutions were obtained by dividing the pile shaft under ground into many small segments and supposing the axial force of the pile and the coefficient of Subgrade Reaction corresponding to each segment to be constants.Together with the pre-existing power series solutions for the pile shaft above ground,the relevant computer program was developed by Fortran programming.The calculation results indicate that the maximum lateral displacement and bending moment increase significantly with the increase of lateral loads.The vertical load can cause the instability of the pile.The soil resistance at the ground surface and the distribution of the coefficient of Subgrade Reaction along depth play important roles in pile responses.The computed results obtained using solutions corresponding to a special case agree well with those obtained using pre-existing solutions,meaning that the presented solutions are dependable.
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Semi-analytical Solutions for Single Piles Under Lateral Loads Based on Subgrade Reaction Method
Journal of Sichuan University, 2011Co-Authors: Yu Jian-linAbstract:In order to investigate the responses of laterally loaded single piles and the principle of the pile-soil interaction,the deflection curve differential equation based on the three-parameter method was introduced.Based on the pre-existing analytical solutions for laterally loaded piles in which the coefficient of Subgrade Reaction was assumed to be a constant and the continuity principle of pile responses,the semi-analytical solutions were submitted.The relevant computer program was developed by Fortran programming,and the obtained solutions were verified by comparing them with the pre-existing solutions corresponding to a special case.The calculation results indicated that the boundary condition at the pile tip plays a marginal role in pile responses when the pile length is comparatively great,the influences of two parameters from the coefficient of Subgrade Reaction,including the index and the parameter which represents the ability of soil at the ground surface to resist the lateral deflection on pile responses are too great to be ignored,and the obtained solutions are effective and can be applied widely.
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Solutions for laterally loaded single pile by nonlinear Subgrade Reaction method
Chinese Journal of Geotechnical Engineering, 2011Co-Authors: Yu Jian-linAbstract:In order to improve the design and calculation of laterally loaded single pile when the pile deflection is comparatively great,the calculation method of the deflection and internal force of the pile is proposed based on the sugrade Reaction method,in which the limiting resistance of soil and the common expression of the coefficient of Subgrade Reaction are considered.Analytical and semi-analytical solutions for the pile shaft in the plastic and elastic zones of soil are presented,respectively,and then the relevant computer program is developed using the Fortran language.The computed results indicate that the displacement and the bending moment increase significantly when the loads increase.The pile head condition plays an important role in the distributions of the displacement and the bending moment along the pile shaft.When the pile length exceeds the critical value,which is almost not influenced by loads and the pile head condition,pile responses nearly do not change when the pile length increases.The maximum lateral displacement and bending moment can be effectively decreased by improving the mechanical properties of the soil surrounding the pile.The maximum lateral displacement decreases when the pile stiffness increases,while the maximum bending moment is hardly influenced by the pile stiffness.The computed values are in good agreement with the measured values from a field experiment,which means that the suggested solutions are reliable.
W. Virgil Ping - One of the best experts on this subject based on the ideXlab platform.
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Developing Correlation Relationship Between Modulus of Subgrade Reaction and Resilient Modulus for Florida Subgrade Soils
Transportation Research Record, 2011Co-Authors: W. Virgil Ping, Biqing ShengAbstract:The resilient modulus of pavement Subgrade is an essential parameter for mechanistically based pavement design procedures; the modulus of Subgrade Reaction (k) is used as a primary parameter for rigid pavement design. The AASHTO pavement design guide (1986, 1993) suggested a theoretical relationship between modulus of Subgrade Reaction and resilient modulus of Subgrade based on the assumption that the Subgrade material is linear elastic. This paper presents an experimental study to evaluate the load-deformation and resilient modulus characteristics of the granular Subgrade soils with the use of field and laboratory tests. An extensive field static plate bearing load testing program was conducted to evaluate the in situ bearing characteristics of typical Florida pavement Subgrade soils. A full-scale laboratory evaluation of the Subgrade performance was conducted in a test-pit facility that simulated the actual field conditions. A laboratory triaxial test was performed to evaluate the resilient modulus char...
Sangseom Jeong - One of the best experts on this subject based on the ideXlab platform.
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Experimental Study of Estimating the Subgrade Reaction Modulus on Jointed Rock Foundations
Rock Mechanics and Rock Engineering, 2016Co-Authors: Jaehwan Lee, Sangseom JeongAbstract:The Subgrade Reaction modulus for rock foundations under axial loading is investigated by model footing tests. This study focuses on quantifying a new Subgrade Reaction modulus by considering rock discontinuities. A series of model-scale footing tests are performed to investigate the effects of the unconfined compressive strength, discontinuity spacing and inclination of the rock joint. Based on the experimental results, it is observed that the Subgrade Reaction modulus of the rock with discontinuities decreases by up to approximately 60 % of intact rock. In addition, it is found that the modulus of Subgrade Reaction is proportional to the discontinuity spacing, and it decreases gradually within the range of 0°–30° and tends to increase within the range of 30°–90°.
