scholarly journals Technical Note: Example of the Application of Jet Grouting to the Neutralisation of Geotechnical Hazard in Shaft Structures

2015 ◽  
Vol 37 (3) ◽  
pp. 95-99
Author(s):  
Piotr Dybeł ◽  
Daniel Wałach ◽  
Justyna Jaskowska-Lemańska
Keyword(s):  
Low Pressure ◽  
Technical Condition ◽  
Technical Note ◽  
Foundation Soil ◽  
Jet Grouting ◽  
Pressure Grouting ◽  
Shaft Lining ◽  
Ventilation Duct

Abstract The article presents a geotechnical hazard neutralisation technology for shaft structures. The diagnosis of problems with uncontrolled subsidence of the ventilation duct provided by the authors enabled the development of a schedule of works required for the protection and reinforcement of foundation soil in the shaft area. The technology of protection works was selected after the analysis of the technical condition of shaft structures as well as hydrological and geomechanical conditions. Due to the closeness of the shaft lining, it was necessary to form grout columns using jet grouting and low-pressure grouting technologies. The article presents the issues related to the selected technology and its application to the neutralisation of the emergent geotechnical hazard. The method of performance of recommended works was also described together with their impact on the technical condition of structures discussed as well as their functionality and usage.

Investigating the Long-Term Settlement of a Tunnel Built over Improved Loessial Foundation Soil Using Jet Grouting Technique

2018 ◽  
Vol 32 (5) ◽  
pp. 04018066 ◽  
Author(s):  
Junling Qiu ◽  
Houquan Liu ◽  
Jinxing Lai ◽  
Hongpeng Lai ◽  
Jianxun Chen ◽  
...  
Keyword(s):  
Foundation Soil ◽  
Jet Grouting

scholarly journals Assessment of the technical condition of deep mine shafts

2018 ◽  
Vol 239 ◽  
pp. 01021 ◽  
Author(s):  
Mikhail Pleshko ◽  
Elena Kulikova ◽  
Andrey Nasonov
Keyword(s):  
Coefficient Of Variation ◽  
Technical Condition ◽  
Water Filtration ◽  
Concrete Lining ◽  
Deep Mine ◽  
Actual Strength ◽  
Shaft Lining

In the present research, the estimation of actual durability of a shaft lining is made, considering the influence of factor of water filtration through “cold” seams of lining. This study is carried out on two vertical shafts of Donbas mines on eight sample plots. The data on the actual strength of the concrete lining after excavation and after 10 years of operation of the shaft were compared. The analysis of the data showed that the zone of “cold” seams is characterized by a decrease in the strength of concrete lining and an increase in the coefficient of variation of strength. It is established that the exhaustion of the resource of the shaft lining in the zone of leaking “cold” seams will occur in 16,9 years after the start of operation of the shaft, which is 4,6 years earlier than in the central areas of the lining stope.

scholarly journals Comprehensive Restoration of an Efficient Technical Condition of the Bearing Brickwork, Having Physical Wear

2020 ◽  
Vol 24 (2) ◽  
pp. 60-72
Author(s):  
S. V. Dubrakov ◽  
K. O. Dubrakova ◽  
A. V. Masalov
Keyword(s):  
Residential Building ◽  
Technical Condition ◽  
Building Structures ◽  
Foundation Soil ◽  
Adverse Conditions ◽  
Area 7 ◽  
Blind Area ◽  
Heating Water ◽  
Inspection Work

Purpose of research. Inspection and assessment of the technical condition of the enclosing structures of a residential building located at st. Engelsa, 107 in Kursk were carried out in connection with the development of the reinforcement project.Methods. Inspection of the technical condition of buildings and structures is necessary to determine the residual resource and service life of the building structures. The current regulatory documents require an examination of the technical condition of buildings and structures no later than two years after their commissioning. In the future, the inspection of the technical condition of buildings and structures is carried out at least once every 10 years and at least once every five years for buildings and structures or their individual elements operating in adverse conditions (aggressive environments, vibrations, high humidity, seismicity of the area 7 points and more, etc.). A permanent monitoring regime is established for unique buildings and structures.Results. In the process of examining a residential building located at st. Engelsa, 107, the following tasks have been solved: determination of damage to enclosing structures; analysis of the results of the study of the degree of wear of building structures; implementation of proposals for strengthening the brickwork. To eliminate the above damages, a proposal was developed to increase the rigidity of the above-foundation part of the building, having previously excluded soaking the foundation soil: by repairing the blind area and heating, water supply and sewerage networks.Conclusion. The solution of a narrow task of strengthening individual structures of buildings and structures may not give the desired result, therefore, when performing inspection work, it is necessary to consider the existing defects and damage in the complex. Within the framework of this work, we consider the strengthening of the load-bearing walls of a residential building with an increase in the overall rigidity of the above-foundation part of the building and the elimination of individual damages.

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