Download or read book Reliability Analysis of Mechanically Stabilized Earth MSE Walls written by Tanit Chalermyanont and published by . This book was released on 2002 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Mechanically Stabilized Earth MSE Wall Inspection Plan and Procedure for Failure Mode Analysis and Risk Assessment written by Ryan Bruce Maw and published by . This book was released on 2009 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: A large component of the State of Utah's transportation network involves the use of MSE walls, which have proven useful in infrastructure for their reduced costs and footprint compared to other alternatives. As effective as MSE walls have been in responding to demands in transportation, they also have inherent challenges. For the majority of MSE walls the structure is limited in observation as structural components are buried as part of the soils mass. This inability to observe at can lead to the development of complex failure mechanisms, which can be difficult to assess and anticipate. As society becomes increasingly reliant on the transportation networks for goods, services, and security, properly understanding the potential failure mechanisms of MSE walls also increases in importance. This thesis discusses the development of an inspection procedure, data collection, geotechnical asset management database, and an evaluation of gathered information to be used in a reliability analysis of MSE walls for the State of Utah. The findings suggest areas of improvement in the design, specifications, maintenance, and further investigation of MSE walls.

Download or read book Evaluation of the Structural Performance of Bridge MSE Retaining Walls written by Zaid SM Momani and published by . This book was released on 2021 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanically Stabilized Earth (MSE) walls have been used extensively since the first MSE wall constructed in California in the early 70's. MSE walls proved that they are reliable, cost-effective, aesthetically pleasing, and easily constructible. However, the design criteria of an MSE wall does not always incorporate the comprehensive behavior. A reasonable number of MSE walls do not perform as expected; a few experienced catastrophic failure. The current study was inspired by multiple MSE walls showing excessive movement of the precast panels in Fort Worth and Hurst, Texas. Three most critical MSE walls were selected for this study. The main focus of this research is to 1) periodically monitor the movement of the walls; 2) evaluate the effect of wall movement on earth reinforcement, precast panels, approach slab, copings and traffic barriers; 3) recommend remedial measures on the earth reinforcement to prevent rupture or pullout; 4) perform several field and lab tests on the backfill soil material to check the integrity of the backfill soil; and 5) develop a 3D Finite Element Modeling (FEM) of an MSE wall using ABAQUS software to predict the actual behavior of an MSE wall and investigate the wall failure criteria. Several non-destructive tests were performed on the critical walls. A laser scanner was used to monitor the movement of the precast panels. Ground Penetrating Radar (GPR) was used to examine the integrity of the earth reinforcement. A subsurface investigation was conducted using Resistivity Imaging (RI) technique to investigate the presence of groundwater table or perched water zones. Regression and structural reliability analyses were carried out to investigate the effect of significant parameters on wall performance and check the integrity of MSE wall design formulas of FHWA (2009), respectively.

Download or read book Interaction Between Drilled Shaft and Mechanically Stabilized Earth MSE Wall written by J.-L. Briaud and published by . This book was released on 2017 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Drilled shafts are being constructed within the reinforced zone of mechanically stabilized earth (MSE) walls especially in the case of overpass bridges where the drilled shafts carry the bridge deck or traffic signs. The interaction between the drilled shaft and the MSE wall is not well known and not typically incorporated into the design. As part of the research project, a full-scale test was conducted in 2012 at Texas A&M University. The test was performed on an MSE wall where the backfill material was clean sand and the soil reinforcement was made of metal strips. Also two real projects w ere instrumented during construction, and data were gathered for one year. A numerical model was used and calibrated against the results of the three full-scale cases. Then a sensitivity analysis was performed and 64 numerical cases were modeled to understand the effect of different parameters on the interaction between the MSE wall and the drilled shaft. The data from the simulations, the full-scale test results, and the monitoring of the real site were processed, and a modification of the current guidelines was proposed for the case where there is a drilled shaft subjected to a horizontal load in the reinforced zone of the MSE wall. A design chart is presented to take into account the addidtional pressure on the wall created by the drilled shaft.

Download or read book Geosynthetics Leading the Way to a Resilient Planet written by Giovanni Biondi and published by CRC Press. This book was released on 2023-09-15 with total page 2826 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the 12th International Conference on Geosynthetics (12 ICG), held in Roma, Italy, 17-21 September 2023. About 750 Authors - Academics, Researchers, Students, Practitioners, Contractors and Manufacturers – contributed to the peer-reviewed papers of this volume, which includes the Giroud lecture, the Bathurst lecture, the Rowe lecture, four keynote lectures and 296 technical papers. The content of these proceedings illustrates the sustainable use of geosynthetics in a variety of innovative as well as consolidated applications. After the sustainability implications in the correct use of geosynthetics, the ability to overcome the natural events effects, often related to the climate change, and to adequately afford the human activities (as the increase of pollution) forced to refer to a new keyword: Resiliency. The 12 ICG intends to become the base for the next step, hence the conference theme is 'Geosynthetics, Leading the Way to a Resilient Planet'. The conference topics, through general and parallel sessions, invited presentations and keynote lectures, address the most recent developments in geosynthetic engineering, and stimulate fruitful technical and scientific interaction among academicians, professionals, manufacturers, students. The 12 ICG proceedings contain a wealth of information that could be useful for researchers, practitioners and all those working in the broad, innovative and dynamic field of geosynthetics.

Download or read book Challenges and Innovations in Geomechanics written by Marco Barla and published by Springer Nature. This book was released on 2022-07-30 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the latest advances, innovations, and applications in the field of computational geomechanics, as presented by international researchers and engineers at the 16th International Conference of the International Association for Computer Methods and Advances in Geomechanics (IACMAG), held in Turin, Italy on August 30 - September 2, 2022. Contributions include a wide range of topics in geomechanics such as: laboratory and field testing, constitutive modelling, monitoring and remote sensing, multiphase modelling, reliability and risk analysis, surface structures, deep structures, dams and earth structures, natural slopes, mining engineering, earthquake and dynamics, soil-atmosphere interaction, ice mechanics, landfills and waste disposal, gas and petroleum engineering, geothermal energy, offshore technology, energy geostructures and computational rail geotechnics.

Download or read book Risk and Reliability in Geotechnical Engineering written by Kok-Kwang Phoon and published by CRC Press. This book was released on 2018-10-09 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Establishes Geotechnical Reliability as Fundamentally Distinct from Structural Reliability Reliability-based design is relatively well established in structural design. Its use is less mature in geotechnical design, but there is a steady progression towards reliability-based design as seen in the inclusion of a new Annex D on "Reliability of Geotechnical Structures" in the third edition of ISO 2394. Reliability-based design can be viewed as a simplified form of risk-based design where different consequences of failure are implicitly covered by the adoption of different target reliability indices. Explicit risk management methodologies are required for large geotechnical systems where soil and loading conditions are too varied to be conveniently slotted into a few reliability classes (typically three) and an associated simple discrete tier of target reliability indices. Provides Realistic Practical Guidance Risk and Reliability in Geotechnical Engineering makes these reliability and risk methodologies more accessible to practitioners and researchers by presenting soil statistics which are necessary inputs, by explaining how calculations can be carried out using simple tools, and by presenting illustrative or actual examples showcasing the benefits and limitations of these methodologies. With contributions from a broad international group of authors, this text: Presents probabilistic models suited for soil parameters Provides easy-to-use Excel-based methods for reliability analysis Connects reliability analysis to design codes (including LRFD and Eurocode 7) Maximizes value of information using Bayesian updating Contains efficient reliability analysis methods Accessible To a Wide Audience Risk and Reliability in Geotechnical Engineering presents all the "need-to-know" information for a non-specialist to calculate and interpret the reliability index and risk of geotechnical structures in a realistic and robust way. It suits engineers, researchers, and students who are interested in the practical outcomes of reliability and risk analyses without going into the intricacies of the underlying mathematical theories.

Download or read book Field Monitoring of Mechanically Stabilized Earth Walls to Investigate Secondary Reinforcement Effects written by Yan Jiang and published by . This book was released on 2015 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Engineering Geology for a Habitable Earth IAEG XIV Congress 2023 Proceedings Chengdu China written by Sijing Wang and published by Springer Nature. This book was released on with total page 839 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Field Study of Construction Deformations in a Mechanically Stabilized Earth Wall written by Nathan Daniel Abele and published by . This book was released on 2006 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanically stabilized earth (MSE) has been used for over thirty years in the United States. The advantages of MSE, including economics, often out weigh their disadvantages. MSE structures are built with a growing frequency and are not likely to disappear in the foreseeable future. Complete understanding of the system has not yet been widely achieved. This thesis is a study of the movement and deformation during construction of a mechanically stabilized earth structure built as a bridge abutment. The MSE wall studied for this research was constructed as part of an ODOT bridge replacement and widening project located in northwest Ohio. The studied MSE system for this project was a Reinforced Earth Company product. The subsurface conditions under the main MSE wall face include an approximate twenty foot thick clay layer over limestone bedrock. Phased construction was used along with both cast in place and precast leveling pads. Some wall facing deformations presented are expected, while others are more difficult to explain. Results of this research provide information that can be used to better understand deformation during the construction process of similar walls constructed in the future. Comparison of these results to performance of other MSE walls may ease concerns of possible larger problems. Further similar work is likely needed to explain some of the trends presented here.

Download or read book Model Uncertainties in Foundation Design written by Chong Tang and published by CRC Press. This book was released on 2021-03-16 with total page 589 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model Uncertainties in Foundation Design is unique in the compilation of the largest and the most diverse load test databases to date, covering many foundation types (shallow foundations, spudcans, driven piles, drilled shafts, rock sockets and helical piles) and a wide range of ground conditions (soil to soft rock). All databases with names prefixed by NUS are available upon request. This book presents a comprehensive evaluation of the model factor mean (bias) and coefficient of variation (COV) for ultimate and serviceability limit state based on these databases. These statistics can be used directly for AASHTO LRFD calibration. Besides load test databases, performance databases for other geo-structures and their model factor statistics are provided. Based on this extensive literature survey, a practical three-tier scheme for classifying the model uncertainty of geo-structures according to the model factor mean and COV is proposed. This empirically grounded scheme can underpin the calibration of resistance factors as a function of the degree of understanding – a concept already adopted in the Canadian Highway Bridge Design Code and being considered for the new draft for Eurocode 7 Part 1 (EN 1997-1:202x). The helical pile research in Chapter 7 was recognised by the 2020 ASCE Norman Medal.

Download or read book Prediction of Soil Reinforcement Loads in Mechanically Stabilized Earth MSE Walls written by Tony M. Allen and published by . This book was released on 2001 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forensic Investigation of Mechanically Stabilized Earth MSE Approaches written by Dar Hao Chen and published by . This book was released on 2008 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: A forensic study was performed to determine: (1) the extent of voids in the retaining wall backfill in the first 1 m behind the wall panels; (2) the extent of moisture in the suspected wet areas where the District is planning to add turnarounds under the bridges; (3) severity of bridge approach settlement and its ride quality; and (4) whether or not there is global stability concern for FM (Farm to Market) 310, FM 1304, and Chatt Rd. mechanically stabilized earth (MSE) walls. Ground penetration radar (GPR), dynamic cone penetration (DCP), drilling, elevation surveys, and instrumentation was performed in this study. Although voids and soft layers were found under the concrete slab, they are all near the MSE wall. Periodic survey results from April 2006 to March 2007 indicate that there is no significant settlement (

Download or read book Soil Dynamics and Earthquake Geotechnical Engineering written by Boominathan Adimoolam and published by Springer. This book was released on 2018-06-09 with total page 268 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected proceedings of the annual conference of the Indian Geotechnical Society, and covers various aspects of soil dynamics and earthquake geotechnical engineering. The book includes a wide range of studies on seismic response of dams, foundation-soil systems, natural and man-made slopes, reinforced-earth walls, base isolation systems and so on, especially focusing on the soil dynamics and case studies from the Indian subcontinent. The book also includes chapters addressing related issues such as landslide risk assessments, liquefaction mitigation, dynamic analysis of mechanized tunneling, and advanced seismic soil-structure-interaction analysis. Given its breadth of coverage, the book offers a useful guide for researchers and practicing civil engineers alike.

Download or read book Proceedings of GeoShanghai 2018 International Conference Advances in Soil Dynamics and Foundation Engineering written by TONG Qiu and published by Springer. This book was released on 2018-05-07 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the sixth volume of the proceedings of the 4th GeoShanghai International Conference that was held on May 27 - 30, 2018. This volume, entitled “Advances in Soil Dynamics and Foundation Engineering”, covers the recent advances and technologies in soil dynamics and foundation engineering. These papers are grouped into four categories: (1) soil dynamics and earthquake engineering, (2) deep excavations and retaining structures, (3) shafts and deep foundations, and (4) offshore geotechnics. It presents the state-of-the-art theories, experiments, methodologies and findings in the related areas. The book may benefit researchers and scientists from the academic fields of soil dynamics and earthquake engineering, geotechnical engineering, geoenvironmental engineering, transportation engineering, geology, mining and energy, as well as practical engineers from the industry. Each of the papers included in this book received at least two positive peer reviews. The editors would like to express their sincerest appreciation to all of the anonymous reviewers all over the world, for their diligent work.

Download or read book Prediction of soil reinforcement loads in mechanically stabilized earth MSE walls written by and published by . This book was released on 2001 with total page 306 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Evolution of Geotech 25 Years of Innovation written by Reginald Hammah and published by CRC Press. This book was released on 2021-11-23 with total page 690 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication includes 82 technical papers presented at Rocscience International Conference (RIC) 2021, held online on April 20 and 21, 2021. Rocscience created this event to bring geotechnical academics, researchers and practitioners together to exchange ideas as part of celebrating 25 years of the company’s existence. The papers in these proceedings were from keynotes, panel discussions and papers, selected after careful review of over 100 technical submissions delivered at RIC 2021. The technical papers were grouped into sessions based on their subject areas. The conference aimed to stimulate discussions that could help the industry work towards overcoming geotechnical engineering limitations today. It also sought to foster creative thinking that will advance the current states of the art and practice. The keynote addresses, panel discussions and technical presentations tried to examine geotechnical problems and situations from fresh perspectives. RIC 2021 hopes that the proceedings will continue to enrich our thinking and contribute to achieving a critical mass of change in our practices and approaches. We look forward to significant improvements in our industry.