GEOTECHNICAL ACCIDENTS OF ROAD STRUTURES AND THEIR LICVIDATION

Abstract

Geotechnical accidents often occur during road operation. To eliminate their consequences, various measures are required, taking into account the geological features of the site. Three cases of geotechnical accidents of road structures are considered: landslide damage to the bridge cone and the slope of the road embankment; the formation of a local landslide, plastic deformation and loss of stability of the roadbed, settlement of the culvert links; suffusion from the side of the railway cut under the cone of the bridge structure due to damage to the anti-filtration clay screen. In the first case, the reasons for the intensification of the landslide were periodic rises in the level of groundwater, the presence of areas not protected by vegetation, and areas of loose soil. The accident was eliminated by installing an anti-landslide structure made of bored piles, embedded with their lower ends into rocky ground. In the second case, the reasons were waterlogging due to heavy summer rains and melting snow next spring. To eliminate the accident, drainage was arranged in the adjacent territory; the soil was partially replaced, reinforcement with geotextiles was carried out, slopes with a berm were laid, the base of the subgrade was strengthened. In the third case, the removal of soil particles (suffusion) from the side of the railway excavation under the cone of the bridge structure occurred due to damage to the anti-filtration clay screen during the creation of the construction site. After the restoration of the screen and the drainage device, the suffusion was eliminated. The above examples show the importance of engineering and geological substantiation in the design of transport construction facilities.