Ground Response Due to Construction of Shallow Pipe-Jacked Tunnels in Sandy Soil: Laboratory Investigation PDF Download
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Author: Yao Yuan Publisher: ISBN: Category : Tunnels Languages : en Pages : 21
Book Description
Pipe jacking is a microtunneling construction technique that is widely used as a trenchless technology in infrastructure and can be adopted in various geological conditions. Ground responses, such as displacements and soil fracturing, will occur during pipe jacking. In order to reduce disturbance to the surrounding soils, factors resulting in ground responses should be evaluated prior to construction. This article presents a series of laboratory tests to investigate the ground response that is due to shallow buried pipe jacking in sandy soil. Single and parallel pipe-jacked tunnel tests were conducted to simulate different construction conditions. Vertical soil displacements and corresponding jacking forces for various cases were observed and discussed. The results indicate that factors such as the existing pipes, the thickness of overburden soil, and the grouting slurry used have significant effects on the ground responses during pipe jacking. Slurry with a proper ratio is proposed for pipe jacking construction. Soil fracturing and grouting overflow can easily occur in the shallow buried tunnels when slurry injection points are opened at the upper side of the pipe. The jacking parameters should also be controlled within a range to reduce the risk of soil fracture and grouting overflow.
Author: Yao Yuan Publisher: ISBN: Category : Tunnels Languages : en Pages : 21
Book Description
Pipe jacking is a microtunneling construction technique that is widely used as a trenchless technology in infrastructure and can be adopted in various geological conditions. Ground responses, such as displacements and soil fracturing, will occur during pipe jacking. In order to reduce disturbance to the surrounding soils, factors resulting in ground responses should be evaluated prior to construction. This article presents a series of laboratory tests to investigate the ground response that is due to shallow buried pipe jacking in sandy soil. Single and parallel pipe-jacked tunnel tests were conducted to simulate different construction conditions. Vertical soil displacements and corresponding jacking forces for various cases were observed and discussed. The results indicate that factors such as the existing pipes, the thickness of overburden soil, and the grouting slurry used have significant effects on the ground responses during pipe jacking. Slurry with a proper ratio is proposed for pipe jacking construction. Soil fracturing and grouting overflow can easily occur in the shallow buried tunnels when slurry injection points are opened at the upper side of the pipe. The jacking parameters should also be controlled within a range to reduce the risk of soil fracture and grouting overflow.
Author: Bai Yun Publisher: Academic Press ISBN: 0128127031 Category : Technology & Engineering Languages : en Pages : 282
Book Description
Underground Engineering: Planning, Design, Construction and Operation of the Underground Space provides the author's vast experience as both an academic and practitioner. It covers Planning, Design, Construction and the Operation of Underground Structures. Targeted at young professionals, students and researchers new to the field, the book contains examples, illustrations and cases from diverse underground uses, from roads to disposal facilities. Sections cover the history of the field, upcoming challenges, the planning stage of the subsurface use, including financial planning and reliability forecasting, site investigation, instrumentation and modeling, construction techniques and challenges, and more. Young professionals in this area will benefit from the updated and complete overview of Underground Engineering. Students will find the examples and cases particularly didactic. Richly illustrated, this book is an excellent resource for all involved in the development of the underground space. Offers a complete introduction to the area, including planning, design, construction and the operation of underground structures Assumes little previous knowledge from readers Presents the most recent techniques and future technical trends Richly illustrated and packed with examples to help readers understand the fundamentals of the area
Author: Kui Chen Publisher: Woodhead Publishing ISBN: 0128201282 Category : Architecture Languages : en Pages : 590
Book Description
Shield Construction Techniques in Tunnelling presents the latest on this fast, environmentally-friendly and relatively safe construction technique, reflecting on its technical risks and challenges as seen in China. Sections introduce the type of shields, the history of the technique, shielding principles, selection, management, the latest techniques in operation, consider engineering cases, discuss construction in gravel, soft-soil, composite, and rock strata, and present video clips of construction that are accessible through QR codes embedded in the text. The book combines theory and practical experience, giving the reader unique insights into shield equipment and construction techniques. The shield tunneling technique is being used very widely, particularly in China, which is building urban-rail transit systems at an unparalleled scale and speed. The use of tunneling-shields provides a fast, relatively-safe, and ecologically-friendly method for the construction of tunnels. However, a number of incidents have shown the risks involved in tunnelling through geologically complex areas. Gives the principles and practice of shield construction techniques, including shield selection and operation Demonstrates the latest technologies in shield construction that can be applied in practice Reflects on the technical risks and challenges of shield construction, based on extensive use of the technique for tunnel construction in China Discusses challenges in construction in gravel, soft-soil, composite and rock strata Provides engineers with applicable insights into shield equipment and construction techniques
Author: Steffen Praetorius Publisher: John Wiley & Sons ISBN: 3433031371 Category : Technology & Engineering Languages : en Pages : 222
Book Description
Pipe jacking is a construction process for the no-dig laying of pipes. Successful pipe jacking demands low skin friction between the ground and the jacked pipe. This is achieved with bentonite lubrication. The bentonite slurry fed into the annular gap fulfils several purposes. It stabilises the annular gap by supporting the surrounding ground and reduces friction contact between ground and jacked pipe. The Bentonite Handbook deals comprehensibly with the relevant aspects of annular gap lubrication: starting with the ground conditions, which are of decisive importance for lubrication, through the rheological properties of the bentonite slurry to the technical components of lubrication technology and lubrication strategy. The use of standardised measuring apparatus is described as well as mixing equipment and the automatic lubrication system. Overview tables with calculations and suggested values for bentonite consumption quantities depending on the prevailing ground conditions and the pipe jacking parameters complete the recommendations.
Author: Klaus Kirsch Publisher: CRC Press ISBN: 0415599210 Category : Science Languages : en Pages : 515
Book Description
When finding another location, redesigning a structure, or removing troublesome ground at a project site are not practical options, prevailing ground conditions must be addressed. Improving the ground—modifying its existing physical properties to enable effective, economic, and safe construction—to achieve appropriate engineering performance is an increasingly successful approach. This third edition of Ground Improvement provides a comprehensive overview of the major ground improvement techniques in use worldwide today. Written by recognized experts who bring a wealth of knowledge and experience to bear on their contributions, the chapters are fully updated with recent developments including advancements in equipment and methods since the last edition. The text provides an overview of the processes and the key geotechnical and design considerations as well as equipment needed for successful execution. The methods described are well illustrated with relevant case histories and include the following approaches: Densification using deep vibro techniques or dynamic compaction Consolidation employing deep fabricated drains and associated methods Injection techniques, such as permeation and jet grouting, soil fracture grouting, and compaction grouting New in-situ soil mixing processes, including trench-mixing TRD and panel-mixing CSM approaches The introductory chapter touches on the historical development, health and safety, greenhouse gas emissions, and two less common techniques: blasting and the only reversible process, ground freezing. This practical and established guide provides readers with a solid basis for understanding and further study of the most widely used processes for ground improvement. It is particularly relevant for civil and geotechnical engineers as well as contractors involved in piling and ground engineering of any kind. It would also be useful for advanced graduate and postgraduate civil engineering and geotechnical students.
Author: Yao Yuan
Author: Yao Yuan
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Author: Faming Huang
Author: Bai Yun
Author: Kui Chen
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Author: Steffen Praetorius
Author: Klaus Kirsch
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