LANDSLIDE PROTECTION STRUCTURE OF INCREASED BEARING CAPACITY AND REDUCED MATERIAL CONSUMPTION
DOI:
https://doi.org/10.31650/2786-6696-2023-4-89-101Keywords:
slope, sliding surface, landslide protection structure, bored piles, buttress, calculation model, numerical modeling, load-bearing capacity.Abstract
Recently, there has been active construction development of territories with difficult engineering and geological conditions. Construction on landslide and landslide-prone slopes leads to increased loads on individual areas, which can cause activation of old or the development of new landslides. As a result of the occurrence and activation of landslides, unacceptable deformations are formed, which lead to a violation of the stability of the slope, as well as the destruction of buildings and structures. Therefore, when performing construction works on slopes, it is necessary to provide measures for engineering protection of territories, buildings and structures located on or near slopes.
On many sites, the placement of slopes and the erection of supporting prisms, buttresses and counterbanks is impossible. This is due to the need to observe the limits of alienation, the presence of residential and industrial buildings. In this case, the most rational means is the installation of pile retaining structures. They are optimal for shear strength of up to 15÷20 m. If it is necessary to contain deep landslides, bored piles are exposed to large bending moments, which leads to an increase in the number of piles or their diameters. As a result, the volume of drilling work and consumption of materials increases significantly. Therefore, issues of rationalization of retaining anti-slide structures are of particular practical interest.
The paper calculation models were developed and numerical modeling of the interaction of elements of two structures of retaining anti-slide structures with the soil massif was performed. Numerical modeling was performed in the licensed geotechnical software complex Midas GTS NX, which implements the finite element method. The behavior of the soil in the calculation schemes was described by the Mohr-Coulomb elastic-plastic model. As a result of calculations of the stress-strain state of the elements of the retaining structures compatible with the soil, the coefficients of the reserve of stability were determined by the reduction method and the value of the internal forces (bending moments and transverse forces) arising in the elements of the structures. The reinforcement of the retaining elements was selected for the obtained internal forces using the "SCAD" software complex. On the basis of a comparison of the costs of the main materials necessary for the construction of structures, the economic feasibility of using a landslide protection retaining structure in the form of buttresses made of bored piles has been proven.
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