Mineral Injection Mixtures for Construction and Operation of Underground Structures under Dense Urban Development Conditions

Abstract

The high level of complexity and responsibility of underground structures implies the need to develop and implement a set of special protective measures necessary for implementation both at the construction stage and at the operation stage of underground structures. During the construction of tunnel and neartunnel structures, various aboveground structures, including engineering and transport structures, are involved in the zone of their influence. It is also important to ensure reliable protection of enclosing structures from the influence of ground water. Dewatering and drainage of soils is accompanied by the development of additional sedimentary deformations that require the implementation of complex and expensive protective measures. To date, effective design and technological solutions have been developed to protect the surrounding development, as well as methods and technologies for eliminating excess deformations and water seepage through the body of enclosing structures using various injection technologies and mineral-based injection systems. Moscow State University of Civil Engineering developed a range of materials that can successfully implement soil strengthening, elimination of sedimentary deformations and elimination of ground water leaks through the enclosing structures of underground structures. It is shown that the protection of buildings and structures from excessive sedimentary deformations during the development of underground space in conditions of dense urban development is provided by the technology of compensatory injection with the use of special mineral-based injection systems. It is established that to eliminate active water seepage through the body of enclosing structures of underground structures, it is advisable to use combined injection systems. Keywords: underground construction, deformations, water seepage, soil precipitation, compensatory injection, injection, impregnation.