Showing papers on "Foundation (engineering) published in 2019"
TL;DR: The number of safety accidents caused by excavation of deep foundation pits in subway stations has been increasing rapidly in recent years as discussed by the authors, thus, precisely predicting the safety risks for subway stations is difficult.
Abstract: The number of safety accidents caused by excavation of deep foundation pits in subway stations has been increasing rapidly in recent years. Thus, precisely predicting the safety risks for s...
70 citations
TL;DR: Using a metric of reaction significance based on river connectivity, this work provides evidence that intermediate levels of connectivity, rather than the highest or lowest levels, are the most efficient in removing nitrogen from Northeastern United States' rivers.
Abstract: U.S. Geological SurveyUnited States Geological Survey; National Science Foundation Hydrologic Sciences ProgramNational Science Foundation (NSF)NSF - Directorate for Geosciences (GEO); USGS National Water Quality Program; DOE Office of Biological and Environmental Research (BER) in the Subsurface Biogeochemistry Program (SBR) as part of SBR's Scientific Focus Area at the Pacific Northwest National Laboratory (PNNL)
69 citations
TL;DR: In this paper, a detailed 3D finite element (FE) model of an 8 MW offshore wind turbine is analyzed by accounting for dynamic soil-monopile interaction in presence of pore pressure effects.
63 citations
53 citations
TL;DR: The study aims to enrich the understanding of the innovative foundation concept and to provide design references for practical applications.
51 citations
TL;DR: Many cases of artificial soft clay foundation constructed by hydraulic filling and improved by the vacuum preloading show the clogging phenomenon in the surrounding soil, which compromises the impr... as discussed by the authors...
Abstract: Many cases of artificial soft clay foundation constructed by hydraulic filling and improved by the vacuum preloading show the clogging phenomenon in the surrounding soil, which compromises the impr...
47 citations
TL;DR: In this paper, a series of centrifuge tests are performed to investigate the vertical bearing capacity of the suction bucket foundation in sandy soil under a drained condition, and the recommended design method is regarded as the upper bound when calculating the ultimate bearing capacity.
46 citations
TL;DR: Sociohydrology: Spatial and Temporal Dynamics of Coupled Human-Water Systems as mentioned in this paper is a special section of the special section dedicated to sociohydrology, with a rich diversity of phenomena studied and an expansion of the knowledge foundations and methodologies applied.
Abstract: Sociohydrology was launched as the science dealing with feedbacks between coupled human and water systems. Much of the early work in sociohydrology involved studies in spatially isolated domains (e.g., river basins) dealing with phenomena that involved emergent patterns in the time domain, with a focus on formulating and testing hypotheses about how they arise. The papers collected in this Special Section “Sociohydrology: Spatial and Temporal Dynamics of Coupled Human‐Water Systems” illustrate that the scientific scope of sociohydrology has broadened over the last few years, with a rich diversity of phenomena studied and an expansion of the knowledge foundations and methodologies applied. These Special Section papers now incorporate methodologies and approaches from a wide range of social science disciplines, including anthropology, complex systems, economics, and sociology. The major themes tackled by these papers are understanding (i) water metabolism—the economic use of water; (ii) interactions between humans and droughts; (iii) interactions between humans and floods; and (iv) the role of human institutions, policy, and management. These collected papers provide a foundation for future research that strives to understand how to achieve water resources sustainability (society to water) and reduce the risk of hydrological hazards in society (water to society). Going forward, we suggest that the development of a common sociohydrology framework will be paramount for research development and student training. Additionally, increased engagement with the broader water management communities will enhance sociohydrology understanding and impact.
45 citations
TL;DR: In this paper, the seismic response of an innovative hybrid monopile foundation is investigated through a series of centrifuge tests, and the seismic performance of the combined system of the superstructure, foundation, and soil are demonstrated.
44 citations
TL;DR: U.S. Geological Survey United States Geological Survey; National Science Foundation Hydrologic Sciences ProgramNational Science Foundation (NSF)NSF - Directorate for Geosciences (GEO); Water Mission Area
Abstract: U.S. Geological SurveyUnited States Geological Survey; National Science Foundation Hydrologic Sciences ProgramNational Science Foundation (NSF)NSF - Directorate for Geosciences (GEO); Water Mission Area
TL;DR: In this paper, the sensitivity of fatigue loads with respect to primary structural, geotechnical and metocean parameters are investigated for a 5MW offshore wind turbine installed on a gravity based foundation.
TL;DR: In this paper, the lateral-moment response of the monopile-friction wheel foundation in saturated sand is investigated via centrifuge tests and three-dimensional finite element method (FEM).
TL;DR: The design and development of a safety monitoring and warning system for deep foundation pits and adjacent buildings is introduced and the results show that the excavation of a rock foundation pit has relatively little influence on the inclination of adjacent buildings.
Abstract: With the development of urban underground space in China, foundation pits have followed a trend toward larger area and greater depth. To ensure the safe excavation of foundation pits, it is necessary to monitor their deformation and the internal force of supporting structures and then use assessments of pit and building stability to guide construction. This paper introduces the design and development of a safety monitoring and warning system for deep foundation pits and adjacent buildings. The monitoring information management system uses Visual Studio 2013 as its development platform and adopts the SQL and C# programming languages to realize its powerful data management and visualization functions. By combined consideration of the monitoring information and the layout of the measuring points, monitoring data on the deformation of the deep foundation pit, ground subsidence and deformation of adjacent buildings are analyzed comprehensively. The results show that: first, the horizontal deformation of the side wall of the rock foundation pit achieves its peak value when 50% of the excavation has been completed and tends to change steadily after the completion of anchor construction. Second, the ground surface around the Fengjing area exhibits upward vertical deformation closest to the side wall of the foundation pit, and then downward deformation at greater distances from it. The ground surface relatively far from the side wall exhibits settlement. Third, the internal force of a plate-ribbed anchor retaining wall in the Fengjing area becomes greater at greater depths. Finally, the excavation of a rock foundation pit has relatively little influence on the inclination of adjacent buildings.
TL;DR: In this article, the authors evaluated the seismic response of a shallow foundation including bearing capacity and settlement over a single DSM column in terms of its diameter and depth and also DSM group columns in terms with the diameter of columns and their center-to-center distance.
Dataset•
04 Jun 2019
TL;DR: In this article, the authors proposed a method for constructing a Naval Facility Engineering Command (NFEC) for the first time, which is based on the work of the National Science Foundation (NSF).
Abstract: National Science Foundation, U.S. Department of Defense Naval Facilities Engineering Command
TL;DR: William D. Loughlin Membership Fund; Raymond and Beverly Sackler Foundation Fund; Friends of the Institute for Advanced Study; Spanish fellowship [PRX18/00444]; Corning Glass Works Foundation Fellowship Fund.
Abstract: William D. Loughlin Membership Fund; Raymond and Beverly Sackler Foundation Fund; Friends of the Institute for Advanced Study; Spanish fellowship [PRX18/00444]; Corning Glass Works Foundation Fellowship Fund
TL;DR: In this paper, the authors present a classification of gravity-based structures (GBS) based on the current state of the field, including the concepts of GBS constructed so far, but also other concepts that are in a less mature state of development.
Abstract: In recent years, the offshore wind industry has seen an important boost that is expected to continue in the coming years. In order for the offshore wind industry to achieve adequate development, it is essential to solve some existing uncertainties, some of which relate to foundations. These foundations are important for this type of project. As foundations represent approximately 35% of the total cost of an offshore wind project, it is essential that they receive special attention. There are different types of foundations that are used in the offshore wind industry. The most common types are steel monopiles, gravity-based structures (GBS), tripods, and jackets. However, there are some other types, such as suction caissons, tripiles, etc. For high water depths, the alternative to the previously mentioned foundations is the use of floating supports. Some offshore wind installations currently in operation have GBS-type foundations (also known as GBF: Gravity-based foundation). Although this typology has not been widely used until now, there is research that has highlighted its advantages over other types of foundation for both small and large water depth sites. There are no doubts over the importance of GBS. In fact, the offshore wind industry is trying to introduce improvements so as to turn GBF into a competitive foundation alternative, suitable for the widest ranges of water depth. The present article deals with GBS foundations. The article begins with the current state of the field, including not only the concepts of GBS constructed so far, but also other concepts that are in a less mature state of development. Furthermore, we also present a classification of this type of structure based on the GBS of offshore wind facilities that are currently in operation, as well as some reflections on future GBS alternatives.
TL;DR: In this paper, a water soaking system (WSS) was improved based on the existing CTE for simulating various loess soaking conditions, and some tests were conducted to show the capability of the improved WSS in centrifugal model tests firstly, then it was used to carry out the tests on a metro tunnel under full-range and half-range foundation soaking conditions with different soaking depths.
Abstract: The collapsibility is one of the key properties for loess. Harmful impacts on the metro tunnels could be obviously subjected to the soaking collapsibility in collapsible loess. However, loess soaking cannot be effectively modeled by the existing centrifugal test equipment (CTE) due to its inherent limitations. In the present paper, a water soaking system (WSS) was improved based on the existing CTE for simulating various loess soaking conditions. The WSS was made of a water storage subsystem and a water distribution subsystem. Some tests were conducted to show the capability of the improved WSS in centrifugal model tests firstly, then it was used to carry out centrifugal model tests on a metro tunnel under full-range and half-range foundation soaking conditions with different soaking depths. The impacts of various soaking conditions on the mechanical properties of the metro tunnel were discussed in detail.
01 Dec 2019
TL;DR: The role and position of educational leadership at this time must also be in line with these developments, both in terms of patterns and communication tools as mentioned in this paper, and the existence of technological developments will affect the principal's interaction pattern as an educational leader with all school residents (teachers, staff, and students).
Abstract: The industrial revolution is currently entering an increasingly advanced era with the support of internet use and digitalization. The 4.0 industrial revolution that is currently developing changes the records of all fields, including the world of education. The incessant flow of information that occurs at this time requires individuals to be able to organize into useful data. The information obtained can change the mindset of individuals. Strengthening character and identity is important so that individuals do not lose their identity. The role and position of educational leadership at this time must also be in line with these developments. Because with these developments, interactions and communication that occur in schools will change, both in terms of patterns and communication tools. The existence of technological developments will affect the principal’s interaction pattern as an educational leader with all school residents (teachers, staff, and students). For the principal’s leadership behaviors and teacher behavior and student behavior to remain in a good corridor, the Pancasila leadership is important and becomes the basis for behaving. Keyword: the leadership of Pancasila, principalship, industrial revolution era 4.0
19 Dec 2019
TL;DR: In this article, a series of three-dimensional finite element (FE) parametric analyses are presented to examine the feasibility of the standard methods (FHWA and API) as well as an analytical solution proposed by the authors through varying scour-hole dimensions, soil properties, and pile properties.
TL;DR: In this paper, a case study in which the construction of a mass concrete bridge foundation in Iowa, USA was investigated and a computer program, ConcreteWorks (CW), was used to predict its overall thermal performance with an aim to prevent thermal cracking.
TL;DR: In this article, the wide-shallow composite bucket foundation (WSCBF) is proposed as an appropriate type of foundation for offshore wind turbines (OWTs), and it has a unique and special substructure.
Abstract: As an appropriate type of foundation for offshore wind turbines (OWTs), wide-shallow composite bucket foundation (WSCBF) is cost-competitive, and it has a unique and special substructure that compr...
TL;DR: In this article, the effects of nonlinear soil behaviors on the structural responses of offshore wind turbines (OWTs) subjected to wind, wave and earthquake loadings are investigated, and a novel seismic analysis framework (SAF) is developed for the assessment of seismic behaviours of OWTs with flexible and fixed foundations.
TL;DR: In this paper, the Russian Foundation for Basic Research (grant #15-04-06567 and partially grant #18-41-242003 r_mk) and the Natural Environmental Research Council (Grant # NE/N009495/1).
Abstract: This research was supported by the Russian Foundation for Basic Research (grant #15-04-06567 and partially grant #18-41-242003 r_mk) and the Natural Environmental Research Council (grant # NE/N009495/1).
TL;DR: In this paper, the impact of the foundation model and calibration approach on the simulated response of a monopile-based OWT installed in the North Sea by comparing simulations and full-scale field data is evaluated.
TL;DR: In this article, a geosynthetic reinforced composite soil (GRCS) foundation system is proposed for seismic protection of mid-rise buildings supported by a shallow foundation potentially suffering from residual structural drift or permanent foundation settlement.