New Techniques in Difficult Ground Tunneling

2000 ◽  
Vol 1740 (1) ◽  
pp. 175-181 ◽  
Author(s):  
Arturo Ressi di Cervia
Keyword(s):  
Traffic Flow ◽  
New Technique ◽  
Soil Conditions ◽  
Soft Ground ◽  
New Techniques ◽  
Tunnel Excavation ◽  
Ground Conditions ◽  
Full Face

The construction of tunnels under soft ground conditions has been solved by the use of special technologies and equipment. This equipment opens new possibilities for the enlargement of existing tunnels while maintaining traffic flow. The work can be done safely and economically even under the most difficult soil conditions. Two new tunneling techniques for the full-face excavation of galleries under difficult ground conditions and one new technique for cut-and-cover tunnel excavation are described.

Volume 13 Issue 2 Editorial Note

2019 ◽  
Vol 13 (2) ◽  
Author(s):  
Anne Lemnitzer
Keyword(s):  
Case Studies ◽  
Editorial Note ◽  
Soft Ground ◽  
Research Papers ◽  
Foundation Construction ◽  
Ground Conditions

We are excited to present the work of five excellent author groups who prepared the research papers and case studies featured in this Issue. Three of the five papers deal with piles and the remaining two papers involve foundation construction on soft ground conditions.

Application of Different Rehabilitation and Strengthening Methods for Insufficient RC Beam-Column Joints

2013 ◽  
Vol 688 ◽  
pp. 222-229
Author(s):  
Özgür Yurdakul ◽  
Özgür Avşar ◽  
Kadir Kilinç
Keyword(s):  
Joint Damage ◽  
Reinforced Concrete Beam ◽  
Soil Conditions ◽  
Rc Beam ◽  
Reinforcing Bars ◽  
New Techniques ◽  
Loss Of Life ◽  
Common Causes ◽  
Column Joint ◽  
Damage Type

Earthquake is one of the most destructive natural disasters that cause loss of life and property in the earthquake prone regions. Unsuitable soil conditions, inadequate material properties and deficiencies in the structural system can lead to costly seismic damages to structures. In this study, damages caused by the earthquake were examined for reinforced concrete beam-column joints. The most common damage type observed in earthquakes is the beam-column joint damage that decreases the lateral load bearing capacity and might be the reason for total collapse of structures. Weak bonding between concrete and reinforcing bars, absence of transverse reinforcement and incapable shear strength of RC beam-column joint are the most common causes for RC beam-column joint damage. After numerous experimental works, different strengthening methods were developed in literature. This paper discusses various strengthening methods including conventional and new techniques as well as their technological application details and the issues arise in practice

scholarly journals A Novel Approach by Using a New Algorithm: Wolf Algorithm as a New Technique in Cryptography

Webology ◽  
2020 ◽  
Vol 17 (2) ◽  
pp. 817-826
Author(s):  
Basim Najim Al-din ◽  
Ahmad M. Manasrah ◽  
Salam Abdulkhaleq Noaman
Keyword(s):  
New Technique ◽  
New Techniques ◽  
Novel Approach ◽  
A New Technique

In order to develop the cryptographic systems, it must always find new techniques to construct the strong cryptosystem, the proposed method try to employ the nature and animals activates in their society to propose the new algorithm for new cryptosystem, depending completely on the behaver of the wolfs communications between each other’s through howls to exchange the information between the wolf’s group to determine the locations and for warning each other’s against the dangers, in this paper propose a new algorithm through classify the characters of the message into groups and exchange the keys between the groups to be difficult on the cryptanalytics to follow the path of constructing the system, also using the different cryptanalysis techniques to evaluate the proposed algorithm.

scholarly journals Development of a parametric model for the organization of scientific and technical support during construction

2021 ◽  
Vol 258 ◽  
pp. 09032
Author(s):  
Mikhail Kashirtsev ◽  
Dmitry Topchy
Keyword(s):  
Parametric Model ◽  
Technical Support ◽  
Soil Conditions ◽  
High Rise ◽  
Unique Object ◽  
Specific Object ◽  
Ground Conditions ◽  
Expert Assessments ◽  
The Russian Federation ◽  
Under Construction

The aim of the study is to create a parametric model, using which it will be possible to formulate a program of measures carried out during the scientific and technical support of construction (STSC) for each specific object, as well as increase the efficiency of construction production by preventing unaccounted indicators during design. The uniqueness of this model lies in the fact that it adapts to the conditions of any object of high-rise construction. As a result, it will be possible to simulate a set of measures for the implementation of STSC for each unique object. Since the construction of a unique high-rise building requires the use of STSC, the question arises of the application of various methods and methods at each object. The unique high-rise buildings and structures considered within the framework of the STSC are unique, therefore, each needs to apply its own parameters relevant to a particular facility. For example, we can say that any parameter associated with the monitoring of the bases will be different for each object, since the ground conditions for each building under construction are different. To create a model, a number of parameters were selected that are most necessary for inclusion in the STSC regulation for the construction of unique high-rise buildings, and each parameter has its own criterion that varies depending on changes in the characteristics of the construction object. All parameters are either related to actual data on the construction object, such as: air temperature, soil conditions, material of load-bearing structures, etc., or depend on and are regulated by the regulatory documents of the Russian Federation. In this case, one can avoid the subjective opinion that occurs when using the method of expert assessments. Also, avoiding the method of expert assessments can reduce the time spent on the study itself, obtaining a result, and making a forecast.

scholarly journals Effects of different processes of tunneling on displacements soil using 3D Finite Element Method

2021 ◽  
Vol 16 (2) ◽  
pp. 203-217
Author(s):  
Nawel Bousbia
Keyword(s):  
Three Dimensional ◽  
Urban Site ◽  
Tunnel Excavation ◽  
Excavation Process ◽  
Tunneling Method ◽  
The Stability ◽  
Full Face ◽  
Ground Stability ◽  
3D Finite Element Method ◽  
Underground Constructions

Abstract The excavation process of tunnels induces stresses and deformation in the surrounding soil. The method of excavation is one of the major problems related to the safety of the operators and the ground stability during the construction of underground works. So, it is necessary to choose an ideal method to minimize the displacements and stresses induced by tunneling. The main aim of this study is to simulate numerically the effect of different processes of tunneling on ground displacements, the settlements at surface soil and the internal efforts induced in the lining tunnel; in order to select the best process of excavation, which gives us a less effects on displacements generated by tunneling, thus, ensuring the stability and the solidity of the underground constructions. In addition, this study allows us to control and to predict the diverse movements generated by tunneling (displacements, settlements, efforts internes) exclusively for the shallow tunnel nearby to the underground constructions in the urban site. This modeling will be done by employing five different processes for tunnel excavation using the NATM (New Austrian Tunneling Method) method. The first process, the modeling of the excavation tunnel, is done almost in the same way as in reality; the partial face excavation, with seven slices, made by the excavation. The second process, by partial face excavation, is divided into eleven slices, next, we used the partial face excavation by nine slices, and then in thirteen slices. Finally, the dig is made by full-face excavation. The paper contributes to the prediction of the response of the soil environment to tunnel excavation using the NATM method and to minimize the diverse movements generated by tunneling. The appropriately chosen methodology confirms that displacements and subsidence are strongly influenced by the tunneling method. The three-dimensional Finite Elements Method using Plaxis3D program has been applied in the numerical simulation. The study resulted in the recommendation of a process that minimizes the effect of excavation on subsidence and ground displacement for a particular Setiha tunnel.

scholarly journals Features of operating the instrument georadar «OKO-250» for refining the ground conditions on the ozernovskaya kosa Kultuсhnogo lake (Petropavlovsk-Kamchatsky city)

2021 ◽  
pp. 110-119
Author(s):  
В.Ю. Павлова ◽  
В.А. Соловьев ◽  
А.С. Кокорева
Keyword(s):  
Soil Erosion ◽  
Moisture Content ◽  
Construction Projects ◽  
Soil Conditions ◽  
Ground Conditions ◽  
The Right ◽  
First Time

В статье представлены результаты работы с прибором георадар «ОКО-250» с целью уточнения грунтовых условий в центральной исторической части города Петропавловска-Камчатского на юго-западном берегу Култучного озера. Метод георадиолокации выполнен впервые. Важно отметить значимость георадара для выявления содержания влаги и эрозии грунтов. Благодаря полученным данным, появляется возможность принять правильные решения при проектировании объектов строительства. The paper presents the results of work with the georadar «OKO-250» device in order to clarify the soil conditions in the central historical part of the Petropavlovsk-Kamchatsky city on the southwestern shore of the Lake Kultuchnoye. The GPR method was performed for the first time. It is important to note the importance of GPR for detecting moisture content and soil erosion. The data obtained helps to make the right decisions in the design of construction projects.

scholarly journals A New Technique for Research on Wound Healing through Extraction of Mandibular Lower Incisors in Wistar Rats

2019 ◽  
Vol 13 (02) ◽  
pp. 235-237 ◽  
Author(s):  
Christian Khoswanto
Keyword(s):  
Wound Healing ◽  
Wistar Rats ◽  
Alveolar Bone ◽  
New Technique ◽  
Incisor Tooth ◽  
New Techniques ◽  
Accelerate Wound Healing ◽  
Tooth Socket ◽  
A New Technique ◽  
Lower Incisors

Abstract Objective The aim of this study was to explain a new technique for research on wound healing through extraction of mandibular lower incisors in Wistar rats. Materials and Methods Fifty Wistar rats were used from studies using the experimental animal to investigate the effects of wound healing drugs on alveolar bone. The mandibular incisors of the Wistar rats were extracted using a special modified bein and special pulling pliers under general anesthesia. The tooth socket after extraction was closed using a 5.0 suture nylon needle. Results The results of this technique used in this extraction showed 2% incisor tooth fracture and 3% bleeding, and that all fractured teeth could be removed properly, and bleeding could be stopped after suturing. Conclusion The new techniques we use can be useful for research on mucosal and alveolar bone healing, specifically finding new types of drugs to accelerate wound healing after alveolar bone post extraction.

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