Humic substances as risk factor for underground structures

Monitoring and testing of buildings and structures

Ways of influence of underground microflora and humic substances on underground building structures are analysed. Experimental data for soil samples are given. Soil samples were taken from metro tunnel in the time of its technic inspection. The classification for biological aggression of soils is proposed. On basis of this classification the research was conducted in the place of future inclined tunnels for projectible branch of underground railway.