The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform
Maosong Huang - One of the best experts on this subject based on the ideXlab platform.
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Winkler load-transfer analysis for laterally loaded piles
Canadian Geotechnical Journal, 2016Co-Authors: Chenrong Zhang, Maosong HuangAbstract:The Winkler Modulus for a vertical beam buried in elastic soil is reassessed for the problem of a horizontal loaded pile in the framework of linear elasticity. By matching the integral solution in elastic continuum and the expression with the elastic Winkler Modulus, the Subgrade Modulus of an infinitely long pile embedded into elastic space is obtained first. Then the influence of embedment depth and pile rigidity on the Subgrade Modulus is evaluated by virtue of Mindlin’s and Kelvin’s solutions, which gives the variation of the Winkler spring stiffness along the pile length. Comparison of the results by the present method for single piles in homogeneous and nonhomogeneous soils has shown good agreement with those obtained from the more rigorous elastic continuum solutions and boundary element method, which also revealed the disadvantage of the conventional Winkler expression in evaluating the displacement of the pile. Finally, the present method is used to analyze the pile–soil–pile interaction of a pil...
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soil pipe interaction due to tunnelling assessment of winkler Modulus for underground pipelines
Computers and Geotechnics, 2013Co-Authors: Jian Yu, Chenrong Zhang, Maosong HuangAbstract:One of the key problems in the implementation of Winkler models to analyze tunnelling effects on existing pipelines lies in the assessment of Subgrade Modulus under external soil displacement. In this paper, an expression of the Winkler Subgrade Modulus for a pipeline buried at arbitrary depth and subjected to free soil displacement with arbitrary curve shape is given. Using superposition principle and the Fourier integral, the Subgrade Modulus of an infinite beam resting on the surface of an elastic half space and buried infinitely are obtained respectively. Then the influence of embedment depth is estimated based on Mindlin and Kelvin solution. The validity of the proposed Subgrade Modulus is verified by comparison with the results from an elastic continuum solution and two centrifuge model tests for the responses of buried pipeline due to nearby tunnelling. Thereafter, parametric studies are shown to assess the accuracy of the proposed Subgrade Modulus by comparing with an elastic continuum solution in homogeneous and non-homogeneous soil stratum and the amount of error is estimated.
Etsuo Sekine - One of the best experts on this subject based on the ideXlab platform.
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Analytical Study on Evaluation of Subgrade Modulus Using Portable FWD
2005Co-Authors: Takahiko Kubodera, Kenji Himeno, Etsuo SekineAbstract:In a portable FWD test, the variations on the loading time and its integration influences the estimated elastic Modulus and K-value of Subgrade even if the peak load is the same. The aforementioned could not be found from the impact numerical FEM analysis of elastic model for the portable FWD. In this research, analytical study has been carried out to investigate the influence of various parameters, such as the mass and the drop height of thefalling weight, on the loading time and its integration from the numerical analysis of viscoelastic model.
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ANALYTICAL STUDY ON EVALUATION OF Subgrade Modulus USING PORTABLE FWD
JOURNAL OF PAVEMENT ENGINEERING JSCE, 2004Co-Authors: Takahiko Kubodera, Kenji Himeno, Etsuo SekineAbstract:It has been indicated, during FWD test, that variations of loading time and time integration of load have influences on the estimated elastic Modulus and K-value of Subgrade even if the peak load is same. The above indication could not be found from the impact numerical FE analysis of elastic model for the portable FWD. In this study, analytical study has been carried out to investigate the influences of various parameters, such as the rigidity of Subgrade, the mass and drop height of falling weight, on the loading time and time integration of load from the numerical analysis of viscoelastic Subgrade model.
Kenan Hazirbaba - One of the best experts on this subject based on the ideXlab platform.
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Effect of soil Subgrade Modulus on raft foundation behavior
MATEC Web of Conferences, 2017Co-Authors: Omer Mughieda, Mohamed Sherif Mehana, Kenan HazirbabaAbstract:The present study is carried out to investigate the effect of soil Subgrade Modulus on bending moment, shear, and deformation characteristics of raft foundation. Subgrade models are an approximate representation for the actual load-displacement behavior of the supporting soil. One of the widely-used methods to model soil Subgrade Modulus is “Winkler” method where the interaction between soil and foundations is represented by a number of springs. The main flaw of this model is the lack of coupling between springs and representation of the non-linearity of load settlement behavior of soil. In this work an attempt is made to analyze “Winkler” method through a commercial software (SAFE V2014) in terms of the effect of soil Subgrade Modulus on the behavior of raft foundation.
Moonkyung Chung - One of the best experts on this subject based on the ideXlab platform.
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A study on the correlation between soil properties and Subgrade stiffness using the long-term pavement performance data
International Journal of Pavement Engineering, 2013Co-Authors: Hee Mun Park, Yong An Lee, Moonkyung Chung, Boo Il KimAbstract:This paper presents the statistical analysis results for correlating the stiffness characteristics of Subgrade with Subgrade soil properties using the long-term pavement performance database in the USA. The stiffness of Subgrade soils was characterised by the falling weight deflectometer deflection basin parameters and Subgrade Modulus calculated using the backcalculation technique. For the statistical approach, both linear fixed- and mixed-effects models were applied to estimate the correlation between Subgrade stiffness and soil properties. It is found from this study that the base curvature index and Subgrade Modulus are highly correlated with Subgrade soil properties and variation of water content. The results also indicate that the mixed-effect model can accurately estimate the stiffness of Subgrade soils using the soil properties and water content. Region-specific factors considered as the sources of random effects in the mixed-effects model can help to improve the degree of correlation.
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Assessment of Influence of Soil Properties on Subgrade Stiffness Using the Long Term Pavement Performance Data
GeoCongress 2012, 2012Co-Authors: Yong An Lee, Moonkyung ChungAbstract:The Subgrade stiffness is essential for pavement design and evaluation. This paper presents the effect of various soil properties on the Subgrade stiffness in the field. Data were extracted from the Long Term Pavement Performance (LTPP) Seasonal Monitoring Program (SMP) database. In this study, the Subgrade stiffness was characterized by the Base Curvature Index (BCI), and the Subgrade Modulus calculated through the backcalculation process. Passing the #200 sieve, maximum dry density and water contents as soil properties were selected to associate with the Subgrade stiffness characterization. It was found from this study that the BCI and Subgrade Modulus are highly correlated with soil properties. It was also observed that the water content is the most significant parameter determining the Subgrade stiffness.
A B Schriver - One of the best experts on this subject based on the ideXlab platform.
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plate load tests on geogrid reinforced expanded shale lightweight aggregate
Geotextiles and Geomembranes, 2002Co-Authors: M R Demerchant, Arun J Valsangkar, A B SchriverAbstract:Abstract In recent years, use of lightweight aggregates in geotechnical applications has increased. An experimental study was therefore conducted on geogrid-reinforced lightweight aggregate beds to determine their Subgrade Modulus. A total of 25 plate load tests were performed in a laboratory test pit measuring 2.2×3.2×1.6 m deep using a 305 mm diameter rigid steel plate. Parameters varied in the study included: soil density (compact and very loose), width of soil reinforcement, location of the top geogrid layer, number of geogrid layers and the tensile strength of geogrid. The results of the testing program are presented in terms of Subgrade Modulus rather than bearing capacity ratio as traditionally presented in the literature. Subgrade Modulus values were calculated for each test at settlements of 6, 12.5 and 25 mm. The results are compared with the data reported in the literature on geogrid-reinforced sands and ceramic beads.
