scholarly journals A New Environmentally Friendly Utilization of Energy Piles into Geotechnical Engineering in Northern China

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jianguo Peng ◽  
Qingwen Li ◽  
Chungho Huang
Keyword(s):  
High Temperature ◽  
Geotechnical Engineering ◽  
Rapid Development ◽  
Northern China ◽  
Tunnel Lining ◽  
Engineering Practice ◽  
Buried Pipe ◽  
Soil Response ◽  
Energy Pile ◽  
Energy Piles

In the past 30 years, because of built-in advantages, energy saving, pollution control, and sustainability, the energy pile system has had a rapid development around the world. Many scholars did numerous researches on the parameters’ optimization, heat exchange efficiency, and structure-soil response. Also, the researches of evolutional GSHP system using high temperature in deep mine and lager collection surface of tunnel lining were learned. At present, most of researchers are discussing the geothermal collection for the heating or cooling the building, and plenteous and significant research achievements have been obtained. It is a novel attempt to apply energy pile to geotechnical engineering, and good results have been achieved in engineering practice in Northern China. The area of northern China is a typical seasonal frozen region: the high temperature in summer and the cold weather and accumulated snow in winter will result in huge challenge and resource consumption of maintaince on highway tunnel, pavement, and other geotechnical engineering facilities. In this paper, taking example of using the geothermal heat exchanger to melt snow, the novel idea of using energy piles to prevent track in summer and crack in winter of pavement, and guaranteeing the safety of frost crack on tunnel lining were discussed. Also, through simulation research, we propose a buried pipe form with good heat transfer uniformity-spiral buried pipe, which has better engineering applicability. This shows us that the application of energy pile in geotechnical engineering will provide solutions to geotechnical problems, which will have a brilliant future.

scholarly journals Load transfer approach for the geotechnical analysis of energy piles in a group with slab

2020 ◽  
Vol 205 ◽  
pp. 05008
Author(s):  
Elena Ravera ◽  
Melis Sutman ◽  
Lyesse Laloui
Keyword(s):  
Load Transfer ◽  
Individual Response ◽  
Thermal Loads ◽  
Thermally Induced ◽  
Soil Response ◽  
Energy Pile ◽  
Analysis And Design ◽  
Energy Piles ◽  
Transfer Method ◽  
Load Transfer Method

Thermally induced group effects characterise closely spaced energy piles. It has been observed experimentally that the behaviour of energy piles subjected to mechanical and thermal loads, in which the piles are located sufficiently close to each other, is different from the behaviour of single isolated piles. Therefore, civil engineers encounter new challenges in the geotechnical design of such foundations. This leads to the necessity to develop practical tools to address their analysis and design. The conventional load transfer method is one of the commonly used methods for the analysis of axially loaded conventional piles. Thus, the purpose of this study has been to propose a formulation of the load transfer method to consider the thermally induced effects among energy piles in groups. The soil response is characterized in a lumped form by ascribing the behavioural features of the soil to interface elements. The individual response, in terms of strain and stress of an energy pile in a group, can be addressed for the first time through the application of the displacement factor in the load displacement curve of the single isolated energy pile. A validation through a full-scale field test reveals the capability of the approach to provide the necessary information in the analysis and design phases of the foundation for one-way thermal loads.

An application of high-temperature superconductors YBCO to magnetic separation

2017 ◽  
Vol 31 (25) ◽  
pp. 1745001 ◽  
Author(s):  
Qiudong Guo ◽  
Peng Zhang ◽  
Lin Bo ◽  
Guibin Zeng ◽  
Dengqian Li ◽  
...  
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
Magnetic Separation ◽  
High Magnetic Field ◽  
Low Cost ◽  
Rapid Development ◽  
High Temperature Superconductors ◽  
New Approach ◽  
Industrial Areas ◽  
Ybco Tape

With the rapid development of manufacturing technology of high temperature superconductive YB[Formula: see text]Cu3O[Formula: see text] YBCO materials and decreasing in cost of production, YBCO is marching into industrial areas with its good performances as source of high-magnetic field and rather low cost in reaching superconductivity. Based on analysis of the performance of high temperature superconductors YBCO and development of technology in superconductive magnetic separation both home and abroad, we propose a new approach of taking YBCO tape to make a solenoid as the source of a high magnetic field of magnetic separatior of ores. The paper also looks into the future of the YBCO high temperature superconductive magnetic separation from the perspective of technology and cost, as well as its applications in other industries.

Historical background and evolution of Soil Mechanics

2021 ◽  
Vol 18 ◽  
pp. 96-113
Author(s):  
Philotheos Lokkas ◽  
Ioannis Chouliaras ◽  
Theodoros Chrisanidis ◽  
Dimitrios Christodoulou ◽  
Emmanouil Papadimitriou ◽  
...  
Keyword(s):  
Building Material ◽  
Soil Mechanics ◽  
Geotechnical Engineering ◽  
Rapid Development ◽  
Building Construction ◽  
Historical Background ◽  
Education Of Students ◽  
Scientific Fields ◽  
Important Branch ◽  
Over Time

The behavior of soil either as a building material or as a load receiver is particularly important and presents a paramount significance in both infrastructure and building construction. Geotechnical engineering has shown a rapid development over the last fifty years and holds a prominent position in all scientific fields of engineers. This paper mainly aims at the historical background along with the progress made on Soil Engineering as an important branch of Surveyors, Civil and Mining Engineers, where, through an important citation of technical works and constructions over time, may be considered as a significant tool for teaching and education of students

scholarly journals Superalloy Technology - A Perspective on Critical Innovations for Turbine Engines

2008 ◽  
Vol 380 ◽  
pp. 113-134 ◽  
Author(s):  
Robert Schafrik ◽  
Robert Sprague
Keyword(s):  
High Temperature ◽  
Customer Value ◽  
Oil And Gas ◽  
Driving Forces ◽  
Ceramic Materials ◽  
Nickel Superalloy ◽  
Engineering Practice ◽  
Jet Engines ◽  
Societal Benefit ◽  
Development Paradigm

High temperature structural materials, such as nickel-based superalloys, have contributed immensely to societal benefit. These materials provide the backbone for many applications within key industries that include chemical and metallurgical processing, oil and gas extraction and refining, energy generation, and aerospace propulsion. Within this broad application space, the best known challenges tackled by these materials have arisen from the demand for large, efficient land-based power turbines and light-weight, highly durable aeronautical jet engines. So impressive has the success of these materials been that some have described the last half of the 20th century as the Superalloy Age. Many challenges, technical and otherwise, were overcome to achieve successful applications. This paper highlights some of the key developments in nickel superalloy technology, principally from the perspective of aeronautical applications. In the past, it was not unusual for development programs to stretch out 10 to 20 years as the materials technology was developed, followed by the development of engineering practice, and lengthy production scaleup. And many developments fell by the wayside. Today, there continue to be many demands for improved high temperature materials. New classes of materials, such as intermetallics and ceramic materials, are challenging superalloys for key applications, given the conventional wisdom that superalloys are reaching their natural entitlement level. Therefore, multiple driving forces are converging that motivate improvements in the superalloy development process. This paper concludes with a description of a new development paradigm that emphasizes creativity, development speed, and customer value that can provide superalloys that meet new needs.

A Basic Analysis of the Application on Linux and μC/O Dual-Core Embedded Operating System in Engineering Practice

2012 ◽  
Vol 246-247 ◽  
pp. 57-61
Author(s):  
Lin Li ◽  
Chan Ji Shan ◽  
Jun Luo ◽  
Nan Xu
Keyword(s):  
Operating System ◽  
Control Systems ◽  
Mobile Communications ◽  
Rapid Development ◽  
Numerical Control ◽  
Engineering Practice ◽  
Embedded Operating System ◽  
Core System ◽  
Research Areas ◽  
Dual Core

With the development of linux and μC/O dual-core embedded operating system, its research areas have been broadened wider and wider. This paper aims to illustrate its importance in engineering practice on the basis of its application in the technological process of injection molding machines and numerical control machines to arrive at its natural conclusion that dual-core system has a brighter and wider prospect by using Linux and μC /OS to solve the problems of Linux because it is more and more widely applied in engineering, mechanical control systems and many other fields such as mobile communications as well as digitalized network, and now is becoming more and more demanded with the rapid development of scientific technology.

scholarly journals Tree-ring based reconstruction of mean maximum temperatures since AD 1829

2013 ◽  
Vol 89 (02) ◽  
pp. 184-191 ◽  
Author(s):  
Zhongjie Shi ◽  
Jixi Gao ◽  
Xiaohui Yang ◽  
Zhiqing Jia ◽  
Hao Guo ◽  
...  
Keyword(s):  
High Temperature ◽  
Tree Ring ◽  
Global Climate ◽  
Northern China ◽  
Warming Trend ◽  
Reconstructed Temperature ◽  
Maximum Temperatures ◽  
Temperature Levels ◽  
June July ◽  
Climate Events

The correlation between tree-ring widths and climate was developed using Pinus sylvestris var. mongolica after which mean maximum temperatures of June–July since 1829 were reconstructed. Results show that the transfer function of temperature explains more than 40% of the variance and that the reconstruction sequence was consistent with several reconstructed temperature variations in the region. Over the past 181 years, climate in the region has undergone eight distinct low temperature and eight high temperature periods. A high temperature period in the 1920s to 1930s is consistent with a drought that occurred in most regions of northern China. Periods of drought in the 1870s were also identified. There was no significant increase or decrease in mean maximum June–July temperatures over the last 181 years, although since the 1950s temperatures have increased gradually. A warming trend has become more pronounced since the early 1990s but temperature levels are not significantly higher than those of the 1850s. A multi-taper spectral analysis shows that there are significant periodicities of 2.4, 2.8, 4.9, 5.1 and 21.3 years in the sequence of reconstructed temperatures. Temperatures were also affected by global climate events and solar activity.

Mitigation of Debris Flows—Research and Practice in Hong Kong

2021 ◽  
Vol 27 (2) ◽  
pp. 231-243
Author(s):  
Ken K. S. Ho ◽  
Raymond C. H. Koo ◽  
Julian S. H. Kwan
Keyword(s):  
Hong Kong ◽  
Debris Flow ◽  
Debris Flows ◽  
Geotechnical Engineering ◽  
Mitigation Strategies ◽  
Mitigation Measures ◽  
Landslide Risk ◽  
Engineering Practice ◽  
Design Methodologies ◽  
Technical Framework

ABSTRACT Dense urban development on a hilly terrain coupled with intense seasonal rainfall and heterogeneous weathering profiles give rise to acute debris-flow problems in Hong Kong. The Geotechnical Engineering Office (GEO) of the Hong Kong SAR Government has launched a holistic research and development (R&D) programme and collaborated with various tertiary institutes and professional bodies to support the development of a comprehensive technical framework for managing landslide risk and designing debris-flow mitigation measures. The scope of the technical development work includes compilation of landslide inventories, field studies of debris flows, development and calibration of tools for landslide run-out modelling, back analysis of notable debris flows, physical and numerical modelling of the interaction between debris flows and mitigation measures, formulation of a technical framework for evaluating debris-flow hazards, and development of pragmatic mitigation strategies and design methodologies for debris-flow countermeasures. The work has advanced the technical understanding of debris-flow hazards and transformed the natural terrain landslide risk management practice in Hong Kong. New analytical tools and improved design methodologies are being applied in routine geotechnical engineering practice.

scholarly journals Thermal Effect on Structural Interaction between Energy Pile and Its Host Soil

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Qingwen Li ◽  
Lu Chen ◽  
Lan Qiao
Keyword(s):  
Thermal Stresses ◽  
Heat Transfer Process ◽  
Structural Element ◽  
Energy Pile ◽  
Structural Interaction ◽  
Comprehensive Method ◽  
Green Power ◽  
Energy Piles ◽  
Distribution Of Stress ◽  
Peak Value

Energy pile is one of the promising areas in the burgeoning green power technology; it is gradually gaining attention and will have wide applications in the future. Because of its specific structure, the energy pile has the functions of both a structural element and a heat exchanger. However, most researchers have been paying attention to only the heat transfer process and its efficiency. Very few studies have been done on the structural interaction between the energy pile and its host soil. As the behavior of the host soil is complicated and uncertain, thermal stresses appear with inhomogeneous distribution along the pile, and the peak value and distribution of stress will be affected by the thermal and physical properties and thermal conductivities of the structure and the host soil. In view of the above, it is important to determine thermal-mechanical coupled behavior under these conditions. In this study, a comprehensive method using theoretical derivations and numerical simulation was adopted to analyze the structural interaction between the energy pile and its host soil. The results of this study could provide technical guidance for the construction of energy piles.

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