The article describes the main technological features of strengthening subsidence soils by cementation. The features of quality control of work on strengthening arrays of subsidence soils by cementation are considered. On the example of a multi-storey residential building exposed to uneven deformations, the reasons for the violation of technologies during the strengthening of the foundation soils are analyzed. The results of laboratory and field tests of soils are analyzed as part of a re-examination of the foundations fixed by the cementation method during the construction of a multi-apartment three-section residential building. The actual results of laboratory tests are compared with the values set by the project. The diagrams of the location of pits near the building are given. The photos show the presence of cement veins. The causes of uneven deformations of the newly erected object have been established based on the results of a laboratory study of the fixed subsidence soil. It is noted that strict quality control of work on strengthening subsidence soils will allow avoiding emergency consequences during the construction and operation of buildings in the future.

Keywords: cementation of soils, subsidence soil, artificial strengthening of soils, injection, geocomposite, armoelement, drilling, testing of soils, construction control