Reasons for Disclosure of Deformation Seams of Foundations at the NPS-2 Station of the Kuyumba – Tayshet Oil Pipeline

Some issues of need for development of the theory and practice of construction under the severe climatic conditions on permafrost soils are considered. The characteristic of severe climate and engineering-geological conditions of the station site is given. Technical solutions to ensure the reliability of the geotechnical system of the site and structural solutions of the foundations are presented. Technical inspection of the slab grillage with determination of physical and mechanical properties of concrete was carried out, defects (cracks) of the structured and their parameters (width, depth and extent) were fixed. During the operation, possible negative geocryological processes such as water accumulation, change in the hydro-geological regime of suprapermafrost waters, seasonal heaving were noted. The results of geo-monitoring and the calculation of deformation and strength with physically nonlinear properties of materials for the II group of limit states with due regard for the joint effect of efforts of thermal strains and shrinkage deformations were obtained. According to the results of a series of checking calculations on deformation and strength of reinforced concrete grillages of tanks, it is established that in the period of the first freeze in the constructions of grillages there are significant tensile stresses, reaching values of about 2.34 to 2.44∙103 kN/m2. On the basis of conducted works, the causes of cracks formation in the high slab grillages operated under severe climatic conditions were determined, and a proposal was formulated on the need for additional study of the influence of the factor of thermal stabilization of the soil on the stress-strain state of reinforced concrete grillage structures.

L.I. KOSHELEVA, Head of the Department of construction materials, corrosion and durability (This email address is being protected from spambots. You need JavaScript enabled to view it.)
S.P. MIUSOV, Chief Designer (This email address is being protected from spambots. You need JavaScript enabled to view it.)
D.G. RYAZANTSEV, Deputy Head of Department of construction materials, corrosion and durability (This email address is being protected from spambots. You need JavaScript enabled to view it.)
S.S. KOVYRSHIN, Chief Specialist (This email address is being protected from spambots. You need JavaScript enabled to view it.)

Research Institute of Concrete and Reinforced Concrete named after A.A. Gvozdev (NIIZHB), JSC “Research Center of Construction” (6, 2nd Institutskaya Street, Moscow, 109428, Russian Federation)

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