Abstract
The article describes a variational method for calculating the motorway subgrade stability. The application of this method allows to quickly and accurately determine the most dangerous sliding surface with a minimum coefficient of stability. The purpose of the article is to improve the variational method for calculating the motorway subgrade stability. The article proposes to apply this method in the calculation of the transport earthwork structures, located in the area of mining operations, where there is a danger of failed subsidence. Underground mining operations have a significant impact on the vertical bent curves of a motorway, that leads to the modification of the subgrade geometric dimensions in the negative direction. This is the cause of sharp fluctuations in the values of local curvature and the radii of vertical curves. The use of variational method for calculating the motorway subgrade stability will allow to take into account the velocity of the saturated soil mass movement and the change in the geometric parameters caused by the underground mining operations. The advantages of this method include the possibility to consider the efforts from geosynthetic materials, recommended to use for strengthening the basement and slopes of the subgrade, the rheological properties of the soil, and the load from the vehicle moving along the surface. In the process of research, regulatory documents on the calculation of the stability of road structures reinforced with geosynthetic materials were studied. The identified shortcomings of the existing regulatory documents allowed to conclude that it is necessary to consider the velocity of the saturated soil mass movement caused by the underground mining operations when calculating the stability coefficient of soil structures.
Highlights
The problem of construction and operation of transport facilities in the areas with developed mining industry is the most acute one
The research results allowed to improve the method of calculating the stability coefficient of the motorway subgrade reinforced with geosynthetic materials, which are located in the area of underground mining operations
The authors propose to take into account the velocity of soil masses displacement when calculating the coefficient of motorway subgrade stability
Summary
The problem of construction and operation of transport facilities in the areas with developed mining industry is the most acute one. When using the motorway subgrade in the zones of underground mining operations, the negative factors should be taken into account, arising from the earth’s surface shifts. The degree of impact of underground mining operations depends on the motorway subgrade position in the trough, and on its size. I.V. Shylin has studied the influence of mining operations on the geometric parameters of the longitudinal profile of the road and determined [1], that trough of the earth surface subsidence under the development of a single horizontal seam with a capacity of 1 m, developed at a depth of 600 m, has the following parameters: maximum subsidence ηmax = 0.536 m, the subsidence trough length Ltr = 621.54 m. Besides the geometric changes in the longitudinal profile, the time factor should be taken into account, as well as possible changes within a given time both of the geometric road dimensions and the parameters of undermining [2]
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