Methodological and computer-based support for choosing underground utility networks renovation method

Goncharenko, Dmitriy; Shumakov, Ihor; Starkova, Olha; Aleinikova, Alevtyna; Mikautadze, Revaz

doi:10.1051/matecconf/201823002010

Cited by 3 publications

(1 citation statement)

References 3 publications

(3 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Аналіз останніх досліджень і публікацій. Нагнітання цементних розчинів застосовують не тільки під час будівництва транспортних тунелів, а й під час будівництва і ремонту тунелів метрополітену [5,6], тунелів і колекторів систем водовідведення [7][8][9]. В цих випадках також забезпечується заповнення зазору між гірською виробкою і конструкцією обробки з метою забезпечення рівномірного передавання навантаження та запобігання подальшої інфільтрації в споруду підземних або ґрунтових вод або, навпаки, ексфільтрації стічних вод із каналізаційних тунелів і колекторів.…”

Section: Abstract the Natural And Technological Factors Influencing On The Depth Of Injection Cement Mortars Penetration Into The Crackedunclassified

Injection Model of Cement Mortar Penetration Into Cracked Rocks Behind Walling

Plugin¹,

Kalinin²,

Miroshnichenko³

et al. 2021

ЗНПУДУЗТ

View full text Add to dashboard Cite

The natural and technological factors influencing on the depth of injection cement mortars penetration into the cracked rocks and emptiness under the lining of mountain tunnels have been studied. There are the width of cracks in rocks and groundwater pressure in them, the dynamic viscosity of the solution, which is determined by the content of additives-superplasticizer and watercement ratio W/C, the magnitude and duration of pressure during the projection (crimping). Thesefacts were established after the analytical of literature sources and the analysis of features, design and a technical condition of real tunnel, geological structure of processing rocks under their lining. Based on the fundamental rheological equation - Newton's law in viscous flow models of dependences of depth of penetration on factors mentioned above are developed. Because of research of these models the sizes of technological factors, including dynamic viscosity of the mortar, providing the required penetration of cement mortars were received. To ensure the penetration of the solution to a depth of 10 m in cracks with a width of 10 mm, the dynamic viscosity should not exceed over 0.05 Pa·s, and in cracks of 1 mm – 0.01 Pa·s. To ensure the penetration of the solution to a depth of 2 m in cracks with a width of 1 mm, the dynamic viscosity should be in the range of 0.03–0.1 Pa·s, and in cracks of 0.1 mm – 0.0025–0, 01 Pa·s. Superplasticizers allows reducing the dynamic viscosity ofsolutions to such values and effectively increasing the depth of their penetration into cracks and, as a result increasing the water resistance and load-bearing capacity of the fractured rock. The technology of injecting cement mortars with superplasticizer additives has been improved and developed for: the reconstruction of underground structures and massive artificial structures; the designing of a spherical bearing between galvanized concrete without a bald spot and the exposedmetal beams. The technology is recommended to be used for waterproofing and increasing the bearing capacity of tunnel, piers, bridges, and for the device of a laying layer between а withoutballast reinforced concrete bridge plate and longitudinal beams of metal bridges.

show abstract

Section: Abstract the Natural And Technological Factors Influencing On The Depth Of Injection Cement Mortars Penetration Into The Crackedunclassified

Injection Model of Cement Mortar Penetration Into Cracked Rocks Behind Walling

Plugin¹,

Kalinin²,

Miroshnichenko³

et al. 2021

ЗНПУДУЗТ

View full text Add to dashboard Cite

show abstract

Determination of cracking causes in building structural elements

2021

View full text Add to dashboard Cite

The article deals with the problems of buildings built many years ago, in which current and major repairs were not carried out in an appropriate manner. At the same time, buildings experience various deformations, such as yield, heel, subsidence, deflections, bends, twists, distortions, horizontal displacements. The survey of residential buildings built in the 80s is described and the analysis of the results of the survey of one of these buildings is carried out. The theoretical problem of the distribution of moisture in depth and various degrees of soil moisture has been solved. The reasons for the appearance of cracks in structures and cracks between individual building elements are also determined. The survey of a 9-storey brick residential building, built in the late 80s, which is in the period of normal operation, is considered. At the same time, the considered building is operated with significant deviations from regulatory requirements. The causes of cracks in individual structures and cracks between individual elements in the building are found. The problem of the distribution of moisture in depth with local soaking is solved on the basis of a numerical method, and the character of soil moistening at different depths with different degrees of moistening and characteristics of the base soil is obtained.

show abstract