scholarly journals Reasons for violation of geotechnology during the building of tunnels and subways

2021 ◽  
pp. 74-82
Author(s):  
Nadiia Smolianiuk ◽  
Anatoliy Bilchenko
Keyword(s):  
Human Factor ◽  
Careful Analysis ◽  
Underground Construction ◽  
Underground Structures ◽  
Soil Characteristic ◽  
Foundation Pit ◽  
Design Engineers ◽  
Natural Factors ◽  
Multiphase Systems ◽  
Over Time

Due to its specificity and increased complexity, the building of underground transport interchanges and subways is often accompanied by the occurrence of emergencies. Each accident requires careful analysis for further consideration of abnormal situations during design and building. Goal. The goal is to find causes of emergencies during the building of tunnels and subways for studying them and gaining experience in preventing such situations in the future. Methodology. The experience in the building of underground structures shows that abnormal emergencies arise because of the influence of unfavorable natural factors, technical malfunctions and the human factor. The analysis of errors in tunneling showed that the violation of geotechnologies is a serious problem, and the occurrence of accidents is influenced by a set of causes that are difficult to predict due to their close interconnection. Results. The use of geotechnologies in underground construction is extremely necessary. Only by establishing cooperation between geotechnicians and design engineers, emergencies can be prevented. Originality. In multiphase systems, soil characteristic is accompanied by its stratification into separate phases, one of which is decompaction. This changes the magnitude of the loads that are transferred to the foundation pit fencing or to the temporary fastening of the tunnel. As a result, an inadequate soil model that is very difficult to assess over time arises. Practical value. During the building of tunnels and subways, it is necessary to clearly identify the cause of each phenomenon that has led to the accident, in order to exclude cost and time overspendings.

scholarly journals Choice of technologies of ensuring exploitation suitability of buildings in the underground construction area

Vestnik MGSU ◽  
2020 ◽  
pp. 452-461
Author(s):  
Emil Imran Оglu Alirzaev ◽  
Marina E. Dement'eva
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Strain State ◽  
The Finite Element Method ◽  
Underground Construction ◽  
Underground Structures ◽  
Stress Strain ◽  
Computer Complex ◽  
Stress Strain State ◽  
Element Method

Introduction. One of the serious problems in the construction of underground structures in a dense urban area is the occurrence of excess deformations of the foundations of operating buildings that fall into the zone of influence of underground construction. The subject of the study was the calculated justification of the modern technology of compensatory injection. The relevance of the task is determined by the fact that the choice of the most effective protection technology should be based not only on a comparison of technological precipitation with maximum permissible values, but also on the assessment of the possibility of monitoring and controlling the movements of the foundations of buildings and structures during construction and subsequent operation. The purpose of the study was to compare various methods of protecting the foundations of existing buildings and structures and justify the selection of the most effective of them for further implementation and dissemination in the design and construction of urban underground structures. Materials and methods. On the basis of the survey data of the operated building falling into the impact zone of excavation of the pit for the construction of the installation and shield chamber of the subway, the parameters of the stress-strain state of its foundations are studied by mathematical modeling. The problem was solved by the finite element method based on the software and computer complex Z_Soil v.18.24. Results. Based on the analysis of the results of the examination of the administrative building using the finite element method, a change in the parameters of the stress-strain state of the foundations was modeled with various technologies for strengthening it. In the course of solving the geotechnical problem, it was found that the minimum impact on the foundations of the building during the construction of the pit was obtained in the method of compensatory injection. The system of criteria for making a decision on choosing an effective way to ensure the suitability of buildings in the underground construction zone for operation is substantiated. Conclusions. The results of this work can be used to justify the choice of technology for prevention and control of excess deformations of foundations. The function for calculating the volume of injected material in the Z_Soil software and computer complex can be used to justify the consumption of materials and the economic efficiency of the technological solution.

The Increasing Laws of the Foundation Strength and Civil Engineering

2011 ◽  
Vol 250-253 ◽  
pp. 2662-2666
Author(s):  
Zhi Hai Qin ◽  
Tong Dong Li
Keyword(s):  
Water Stress ◽  
Bearing Capacity ◽  
Pore Water ◽  
Effective Stress ◽  
Civil Engineering ◽  
Building Construction ◽  
Foundation Pit ◽  
Engineering Construction ◽  
Building Load ◽  
Over Time

In the civil engineering construction, with the building load of building construction or adding storeys, foundation pit dewatering, embankment filling , over time, the pore water stress that is borne by pore water in the foundation decreases gradually, the effective stress that is borne by particle increases gradually, the foundation bearing capacity increases gradually, we use different methods to derive the variation law in the theoretical solution, and carry on the comparison, then get the same conclusion. By using theory to solve the frequently encountered problems during civil engineering construction, including the problems of building construction or adding storeys, foundation pit dewatering, embankment filling, it provides theory basis for both economical and safe civil engineering construction .

Construction Technique of Cement-Soil Mixing Anchor in Foundation Pit in Soft Soil Area

2011 ◽  
Vol 261-263 ◽  
pp. 1784-1788
Author(s):  
Gan Bin Liu ◽  
Rong Hua Ye ◽  
Li Xu ◽  
Xue Yi Shen
Keyword(s):  
Soft Soil ◽  
Drill Pipe ◽  
Soft Clay ◽  
Mechanical Equipment ◽  
Pullout Capacity ◽  
Foundation Pit ◽  
Construction Technique ◽  
Soil Mixing ◽  
Design Engineers ◽  
Cement Soil

In this paper, the construction technique of a new soil anchor-the cement-soil mixing anchor, which is applicable in the area of soft clay, is introduced. During the construction of the anchor, the drill pipe and blade is served as a reinforced body and formed an anchorage body with the cement-soil body. The material and making, technics parameters, mechanical equipment and construction requirement of the cement-soil mixing anchor are presented firstly. Then, the uplift tests of the cement-soil mixing anchor are carried out, and the ultimate pullout force which is 1.6 times greater than that of the soil nailing in the same condition is obtained. At last, an application of the cement-soil mixing anchor in a foundation pit is given. The test results shown that the application of the cement-soil mixing anchor can reach the expected reinforcement effect. Therefore, this framework can then be used by design engineers to more confidently estimate the pullout capacity of cement-soil mixing anchors under tension loading.

scholarly journals Al-Magrizi Inflation Theory Of Islamic Monetary Policy Implementation In Indonesia

2021 ◽  
Vol 2 (2) ◽  
pp. 150
Author(s):  
Ridan Muhtadi ◽  
Safarinda Imani
Keyword(s):  
Monetary Policy ◽  
Policy Implementation ◽  
Human Error ◽  
Human Factor ◽  
Economic Thought ◽  
Natural Factor ◽  
Natural Factors ◽  
Two Factors ◽  
The Subject ◽  
Islamic Economic

During the time of Imam al-Magrizi (766-845 H), inflation had occurred in Egypt. Al-Magrizi shows about the theory of inflation. Inflation becomes a discourse that studied heavily in the subject of the economy. Al-Magrizi is an Islamic economic thought who did a particular study of money and inflation. The paper focused on al-Magrizi inflation theory caused by two factors, namely natural factors and human error factors. To solve these factors, a nation could apply Islamic monetary policy to Umar Chapra's thought, namely a credit-oriented (financing) location as a solution of natural factor theory. Also, moral suasion or moral appeals as a solution to the human factor inflation theory.

scholarly journals Safety Management System Prototype/Framework of Deep Foundation Pit Based on BIM and IoT

2021 ◽  
Vol 2021 ◽  
pp. 1-19
Author(s):  
Wenhan Fan ◽  
Jianliang Zhou ◽  
Jianming Zhou ◽  
Dandan Liu ◽  
Wenjing Shen ◽  
...  
Keyword(s):  
Management System ◽  
Safety Management ◽  
Deformation Monitoring ◽  
Structural Deformation ◽  
Underground Construction ◽  
Construction Sites ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Safety Management System ◽  
Deep Foundation Pit

With the huge demand for building underground spaces, deep foundation pits are becoming more and more common in underground construction. Due to the serious effects associated with accidents that occur in deep foundation pits, it is very important for underground construction safety management to be proactive, targeted, and effective. This research develops a conceptual framework adopting BIM and IoT to aid the identification and evaluation of hazards in deep foundation pit construction sites using an automated early warning system. Based on the accident analysis, the system framework of Safety Management System of Deep Foundation Pits (SMSoDFP) is proposed; it includes a function requirement, system modules, and information needs. Further, the implementation principles are studied; they cover hazardous areas, namely, visualization, personnel position monitoring, structural deformation monitoring, and automatic warning. Finally, a case study is used to demonstrate the effectiveness and feasibility of the system proposed. This research provides suggestions for on-site management and information integration of deep foundation pits, with a view to improving the safety management efficiency of construction sites and reducing accidents.

scholarly journals MARKETING SERVICES MIX FOR HEALTHY TERRITORIES: EUROPE – UKRAINE FEATURES

2020 ◽  
Author(s):  
Anna Rosokhata ◽  
◽  
Nataliia Letunovska ◽  
Adam Jasnikowski ◽  
Daria Moiseienko ◽  
...  
Keyword(s):  
Public Health ◽  
Human Factor ◽  
Marketing Mix ◽  
Over Time

The peculiarity of healthy territories is that this concept is complex and multifaceted. It includes implementing a healthy economy in some territory and security of public health in a particular territory. Therefore, from the standpoint of the territories' marketing as a component of the country's economy, it should be considered comprehensively. Usually, it is customary to use the 4P complex for territory marketing, but when we research a healthy territory, this concept is continually changing over time and shaping its image. In this case, for the implementation of healthy territories marketing and its image, it is advisable to use additional elements of the marketing mix, which can describe the processes and the human factor and the conditions of the territory marketing.

Risks as a cause of industrial safety inhibition in underground construction

2020 ◽  
pp. 146-154
Author(s):  
E. Yu. Kulikova ◽  
O. V. Vinogradova
Keyword(s):  
Underground Structure ◽  
Regulatory System ◽  
Mine Planning ◽  
Psychological Climate ◽  
Industrial Safety ◽  
Accident Risk ◽  
Underground Construction ◽  
Underground Structures ◽  
Planning And Design ◽  
Definition Of

Underground construction is always affected by numerous hazards. The risks degrade safety and longevity of underground structures. The risk analysis shows that the main root causes of risk are the errors and ill-coordinated wok of personnel in construction and operation of an underground facility. The major risks in underground construction are described. The modes of industrial supervision over construction quality are presented. The definition of an accident risk is discussed. The majority of accidents falls at the errors of personnel, both managers and executives. Shortage of skills, lack of coordination, violation of labor discipline and deficiency of control lead to disasters in underground constructions. The required organizational arrangements are developed subject to assessment of underground structure conditions. Mitigation of technical risks should base on advance of protection technologies and equipment to ensure collective safety of workers. Furthermore, it is necessary to improve regulatory system, assessment of the industrial environment condition, mine planning and design methods, etc. Organizationally, risk reduction needs creation of social and psychological climate to motivate personnel to work safely and efficiently, including each individual and the whole company.

Methodical principles for improving the ecological and technological reliability of urban underground structures

2020 ◽  
pp. 176-185
Author(s):  
E. Yu. Kulikova
Keyword(s):  
Underground Space ◽  
Head Part ◽  
Underground Construction ◽  
Underground Structures ◽  
Rock Formations ◽  
Jet Grouting ◽  
Geological Conditions ◽  
Scientific Task ◽  
Modern Experience ◽  
Urban Conditions

Construction processes and construction conditions are never repeated. Therefore, a method for improving environmental and technological reliability, which is applicable to the development of underground space, is necessary. Improving environmental and technological reliability in the development of the underground space of cities should be based on the reliability of the construction technologies. Systematization and analysis of world experience in the use of various combinations of construction technologies that increase the reliability of construction of underground facilities is an urgent scientific task, the solution of which allows increasing the efficiency of underground space development. Modern experience of underground construction expands the range of possibilities for improving the reliability of underground space development, based on the use of various underground construction technologies. Thus, the design of the head part of the tunneling boards is being improved, and the range of conditions for their use is increasing from inhomogeneous unstable soils to fragmented rock formations. The technology of micro - and mini-tunneling for laying pipelines for various purposes is becoming widespread. In almost any mining and geological conditions and at any depth, the new Austrian method of tunneling is used. Methods of soil strengthening aimed at reducing the risk of precipitation of the earth’s surface in urban conditions are being improved: chemical reinforcement, jet-grouting, etc. The role of monitoring of deformations and sedimentation of the earth’s surface in the area of underground object placement, its scientific support at all stages of the life cycle, and measures to minimize all types of risk is increasing.

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