Geodetic Deformation Monitoring of a Residential Building Constructed on a Sloping Site
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GEOTECHNICAL MONITORING GEODETIC DEFORMATION MONITORING OF A RESIDENTIAL BUILDING CONSTRUCTED ON A SLOPING SITE
UDC 624.131.54 Y. S. Grigor'ev and V. V. Fateev Nizhny Novgorod State University of Architecture and Civil Engineering, Nizhny Novgorod, Russia, *Corresponding author Email: [email protected].
This article presents an analysis of long-term deformation surveys of a seven-story residential building located on a site over a filled-in ravine tributary. The results of geodetic monitoring and computer simulation of the joint load of the building, its foundation slab, and the ground were used in the justification of measures necessary for ensuring accident-free operation of the building.
Introduction In 1996, a seven-story brick residential building was constructed on a site over a filled-in ravine tributary in Nizhny Novgorod (Fig. 1). The L-shaped building is divided into three sections by two thermal expansion joints. The following construction materials were used: silica brick for the walls; precast reinforced-concrete hollow-core slabs for the inter-floor and roof elements; a 600-mm-thick continuous flat reinforced-concrete slab on the ground base for the foundation. Already at the construction stage, uneven structural settlement of the building began, which has been accumulating for over 23 years. It should be noted that, during the construction process, it was decided to increase the number of floors from 5 to 7, which led to a significant increase in the load. Measures to strengthen the ground base implemented in 1998-2002 turned out to be ineffective [1]. In this work, an analysis of uneven deformations in the building developed from the onset of its construction to 2019 was performed. This information is essential for the development of measures aimed at strengthening the ground base and the foundation slab, thereby ensuring accident-free operation of the building. Monitoring Data And Analysis According to the research carried out by the authors in 2013-2015 [1], strains and fractures in the residential building under study are largely associated with excessive uneven settlement of the ground base. The main problem was the choice of an inappropriate foundation type, which occurred due to abandoning of the originally developed pile foundation project in favor of a flat continuous reinforced concrete foundation slab established on a highly compressible embankment of variable capacity from 2.1 to 11.5 m. This embankment was formed as a result of prolonged sporadic filling of a ravine located in the construction site area.
Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 5, pp. 17-21, September-October, 2020. 0038-0741/20/5705-0401
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Section 2
Section 3
Section 1
Fig. 1. Layout of sections and settlement marks installed in the walls of the seven-story three-section residential building along the outer perimeter (cm)
TABLE 1 Section No. 1 2 3
Settlement S, mm Tilt i ix iy min. max. avg. 124 358 231 0.001 0.007 303 1323 858 -0
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