Effect of Reinforcement Compromise on the Behavior of Mechanically Stabilized Earth Walls PDF Download

Author: Ahmed Ragheb
Publisher:
ISBN:
Category :
Languages : en
Pages : 100

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Author: Heung Sea Kim
Publisher:
ISBN:
Category : Retaining walls
Languages : en
Pages : 258

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Author: Wade H. Shafer
Publisher: Springer Science & Business Media
ISBN: 1461528321
Category : Science
Languages : en
Pages : 350

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Book Description
Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1 957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 36 (thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 36 reports theses submitted in 1991, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Author: Christina Vulova
Publisher:
ISBN:
Category : Earth pressure
Languages : en
Pages : 530

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Author:
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Category :
Languages : en
Pages : 226

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Author: Yan Jiang
Publisher:
ISBN:
Category :
Languages : en
Pages : 75

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Mechanically stabilized earth (MSE) walls have been commonly used in highway construction. AASHTO (2007) has detailed design procedures for such a wall system. In the current AASHTO design, only primary reinforcements are used in relatively large spacing (commonly 2 feet), which requires higher connection strength between reinforcements and wall facing. Large spacing between reinforcements may also increase the chances of wall facing bulging and construction-related problems. To alleviate such problems, the use of secondary reinforcements installed between primary reinforcements was proposed. The use of secondary reinforcements could (1) reduce the required connection load for primary reinforcement, (2) increase the internal stability by secondary reinforcement, (3) improve the compaction near the wall facing, and (4) mitigate the down-drag behind the wall facing. However, this idea was not verified in practice. To improve the understanding of the performance of MSE walls with secondary reinforcement and verify its benefits in practice, three MSE wall sections reinforced with geogrids were constructed and monitored in the field: (1) an MSE wall section with uniaxial geogrids as primary and secondary reinforcements, (2) an MSE wall section with uniaxial geogrids as primary reinforcements and with biaxial geogrids as secondary reinforcements, and (3) an MSE wall section with uniaxial geogrids as primary reinforcements only (i.e., the control section). Earth pressure cells, inclinometer pipes and a probe, and foil-type strain gauges were used in these three test wall sections to measure the vertical and lateral earth pressures, lateral wall facing deflections, and strains of primary and secondary geogrids, respectively. The measured results (i.e., the wall facing deflections, the vertical and horizontal earth pressures, and the strains of geogrids) were compared with those calculated using AASHTO (2007). Based on the analysis of the field test results, major conclusions can be drawn in the following: (1) the secondary reinforcements reduced the wall facing deflections as compared with those in the control section; (2) the measured vertical earth pressures were close to the computed trapezoid stresses and increased with the construction of the wall; (3) the distribution of the measured lateral earth pressures in the control section linearly increased with depth, while the distributions of the measured lateral earth pressures in the sections with secondary reinforcements were approximately uniform with depth; (4) the measured tensile strains at the connection in all sections were small; and (5) secondary reinforcements reduced the maximum tensile strains in the primary geogrids.

Author: Andrew W. Strahler
Publisher:
ISBN:
Category : Retaining walls
Languages : en
Pages : 395

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The implementation and construction of Mechanically Stabilized Earth (MSE) walls has undergone substantial expansions in recent years, owing to its relatively low cost, ease of construction, and high efficiency compared to conventional retaining methods. As a result, MSE walls are being constructed to greater heights with complex features (e.g. multiple tiers, equivalent batter angles, close reinforcement spacing) even though impacts on wall response associated with these characteristics are not well understood. Available methods to predict wall responses are limited to empirical databases of single tiered walls less than 20 m and designers are left to complex finite element modelling to estimate the behavior of tall walls (walls with heights greater than 20 m). The current study aims to provide practitioners with a better understanding of the working stress behavior of tall MSE walls during and after construction through the use of a calibrated numerical model that incorporates pressure dependent soil, panel-soil interaction, non-linear soil reinforcement interaction, facing rigidity, foundation stiffness, and compaction stresses. First, an extensive laboratory investigation is conducted to characterize the plane strain and three dimensional stress-strain and stress-dilatancy response of a well-graded gravelly soil. Laboratory pullout tests are performed to characterize the influence of reinforcement spacing on load-displacement response. Results from the high quality laboratory investigations are used to calibrate specific numerical elements in FLAC (e.g. reinforcement-soil interface, facing-soil interface, soil constitutive response) incorporating pressure dependent constitutive responses. A numerical model representing a 46 m tall MSE wall is developed in FLAC, incorporating calibrated element parameters. Measurements made during the construction of a 46 m tall MSE wall are used to establish those factors within the model that most accurately simulate the observed wall performance. Results from a geometric parametric study conducted to assess the influence of boundary conditions on wall response are presented, focusing on impacts associated with tier height, tier offset, and wall height. The synthesis of the results from the geometric parametric study are used to establish a more thorough understanding of wall response, with specific emphasis on wall displacements and reinforcement strains.

Author: W. H. Shafer
Publisher: Springer Science & Business Media
ISBN: 9780306444951
Category : Education
Languages : en
Pages : 368

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Book Description
Volume 36 reports (for thesis year 1991) a total of 11,024 thesis titles from 23 Canadian and 161 US universities. The organization of the volume, as in past years, consists of thesis titles arranged by discipline, and by university within each discipline. The titles are contributed by any and all a

Author: Pamela Elaine Kotrys
Publisher:
ISBN:
Category :
Languages : en
Pages : 296

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Author: Tony M. Allen
Publisher:
ISBN:
Category : Retaining walls
Languages : en
Pages : 112

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