The article describes the conduct of field studies carried out during the overhaul of the cultural heritage object – the building of MBOU "Gymnasium No. 45" to establish rational parameters of injection of cement-sand mortar, the choice of the type and design of injectors and the scheme of drilling injection wells. It is proved that the technical solutions adopted in the soil fixing project are not optimal and do not provide the required quality of work. Recommendations on technological and constructive solutions for fixing soils have been developed and implemented in practice, taking into account engineering and geological conditions, the results of the survey and fixing at the pilot site.

Keywords: subsidence soil, foundation, cementation, injector, well drilling, geocomposite

The problems of the operation of buildings on subsidence soils of the Rostov region are considered. A brief analysis of the methods used to consolidate the soil. Concrete examples of the use of cementation and silicatization of soil bases in the development of reconstruction projects for buildings in the cities of Shakhty and Taganrog, Rostov Region are given. An integrated approach to the choice of technology for fixing the soil base of reconstructed objects is proposed, which provides for the simultaneous consideration of the following factors: - basic physical and mechanical properties of soils; - mineralogical composition of soils; - change in the state of the soil base during the operation of the building (local decompression, erosion, chemical and mechanical suffusion, etc.); - chemical composition and groundwater level, forecast of their change; - terrain, the danger of activation of landslide processes; - the presence of retaining walls and other retaining structures in the zone of influence, assessment of the loads on them in the process of consolidation; - the technical condition of building structures of the building, including its underground part and the blind area; - the status of the reconstructed object. With special care and precaution, it is necessary to choose the technological and design parameters of soil consolidation for cultural heritage sites of federal or regional significance; - technical and economic indicators.

Keywords: subsidence of soils, strengthening of soils, fixing of soils, cementation, silicatization, Geology, construction, cultural heritage object

As a result of the analysis of normative documentation and soil fixing works, a brief historical review of the physicochemical methods of soil fixing was presented. Examples of the application of these methods in Russia and the world are considered.

Keywords: subsidence soils, cementation, soaking, heaps, mudding, subsidence, deformation, pit, soil consolidation

Restoration and strengthening of building structures damaged during operation in conditions of constant soaking and aggressive influence of liquids. On the example of the overhaul of the floor structures of the premises and tunnels of the champagne factory "Abrau-Durso" were shown the most effective and technological ways to strengthen the load-bearing structures.

Keywords: shotcrete, concrete, reinforcement, bearing structures, reinforcement, bearing capacity, shotcrete, reinforcement, corrosion, repair, finishing

The use of benign technologies in the reconstruction of a building that is an object of cultural heritage is analyzed on a concrete example. Conclusions on the use of selected technology

Keywords: cultural heritage, cultural heritage object, preservation of cultural heritage objects, monument, sparing technologies, restoration, soil, consolidation, foundation, foundation, deformation, inspection

The analysis of methods for assessing the quality of work on the consolidation of soil massifs with different compositions was carried out, the shortcomings of the existing methods were noted. A new device for determining the properties of a soil massif, fixed by the method of reinforcement with cement-sand mortar, was proposed. The design and features of the application of the developed device for evaluating the deformation properties of a fixed array are described. An example of obtaining and processing the results of soil tests by the developed device is given.

Keywords: soil reinforcement, cement-sand mortar, quality control, die tests, geophysical methods, drilling, draft, deformation module

The methods of injection fixing the soils of the base under the foundations of cultural heritage are considered. The specific examples show the features of soil consolidation by cementation and silicatization methods. The technological features of soil consolidation, taking into account the material of the foundations and the technical condition of cultural heritage sites are given

Keywords: cementation, silicatization, injector, soil, consolidation, foundation, object of cultural heritage, sediment, subsidence, deformation

The analysis of the projects for securing the soil foundations, which are part of the new construction projects of educational institutions in the Rostov region in 2016-18, is carried out. On the example of the construction of schools in the cities of Rostov-on-Don, Taganrog, Shakhty, Novocherkassk, Aksai and the village of Chaltyr, the main technical and technological solutions for soil consolidation are considered, depending on the engineering and geological conditions of the construction sites

Keywords: cementation, injector, soil, consolidation, foundation, soil piles, retaining walls, sediment, subsidence, deformation

The results of a survey of the technical condition of the buildings included in the list of objects of the cultural heritage of the Rostov Region are analyzed. Identified features of the foundations of buildings built in the middle of the XIX - early XX centuries. Recommendations are given on the preliminary assessment of the scope of work on the technical survey of foundations and foundations, as well as restorations for similar buildings constructed in the specified period

Keywords: objects of cultural heritage, bases, foundations, inspection of the technical condition of buildings

Information was collected on the multi-apartment housing stock of six mining towns in the Rostov region: Gukovo, Donetsk, Zverevo, Kamensk-Shakhtinsky, Novoshakhtinsk and Shakhty. A general analysis of emergency residential buildings was carried out in accordance with the year of construction and the number of buildings commissioned and square meters of living space. In the example of the city of Shakhty, the location of the emergency houses relative to the mining zones at shallow depths, the spread of loess subsidence soils, and possible flooding is discussed in detail. Thanks to the map created with the help of the GIS program SAS.Planet, conclusions are drawn about the location of the emergency structures. It is determined that the largest number of houses that are recognized as unfit for further exploitation are located within the distribution zones of the three negative factors listed above or in the immediate vicinity of them.

Keywords: loess soils, flooding, restructuring of the coal industry, postmining, urban areas, emergency buildings, geoinformation systems

The analysis of the gap pile Foundation of the bridge during construction the compressor station "Baydaratskaya" on the Yamal Peninsula, applying the technology of construction in the far North region, identified the cause of the destruction of pile Foundation (pile-rack). The analysis of deformation has been proven the urgency of the problem of deformation and destruction of the bridge piers on the border "water-air" in different traffic and climatic zones of Russia, including in the far North. Based on a practical analysis of the problem of the destruction we can draw the following important conclusions: - The destruction the bridge piers, piles in the area of "water-air", because of intense deformation and the requires external sources of protection. - Further study zone "water-air" is true in our time, and existing protection methods are not able to protect the structure from damage. - necessary practical research to identify ways to protect bridge piers in the area of "water-air". - necessary to control the state of the bridge's pillars after the construction of protective structures above the water level

Keywords: bearing bridge, metal pile, permafrost, concrete, load and impact, thermal deformation, stress-strain state, welding, welds