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THE IMPACT OF THE FOUNDATION PIT WITH ADDITIONAL TRANSVERSE WALLS ON THE SURROUNDING BUILDING AND THE ASSESSMENT OF THE EFFECTIVENESS OF THE MEASURES UNDER CONSIDERATION

Currently, the implementation of the largest infrastructure projects of the capital continues. The development and modernization of urban transport is accompanied by a large number of deep open workings, often located in established areas of Moscow with developed buildings. Standard design solutions are not always able to provide the necessary safety of nearby buildings, so in some cases additional measures are needed. In this paper, the construction of a pit of an assembly-panel chamber with the use of protective measures in the form of additional transverse walls is considered. To evaluate the effectiveness, compare the results and consider the features of this solution, a series of calculations were carried out in spatial and flat formulation. Within the framework of a two-dimensional task, a methodology for accounting for these measures was proposed, showing close efficiency values in relation to the 3D model. The effects of concrete creep were also considered by using the initial modulus of elasticity Eb and the modulus of deformation Eb,τ. According to the results of calculations of the spatial scheme, the introduction of additional walls reduced the horizontal movements of the fence by 29 %, additional precipitation of foundations by 55 %, creep accounting, in turn, increased the horizontal movements of the SVG by 37 %, but reduced the value of the bending moment by 30 %. However, the actual values of additional deformations of the foundations still turned out to be less than predicted. Thus, it is worth noting that this type of measures is an effective way of passive protection of the surrounding development, implemented at the stage of design decisions, the full effect of which is clearly reflected in the results of the calculation of spatial models and in-situ monitoring data.