Modelling of the optimal height of the variable edge of a volumetric anti-filtration geotextile coating for restoring failed water supply structures

Abstract

This article presents the results of numerical modelling of the optimal height of the variable edge of a volumetric anti-filtration geotextile coating for the restoration of failed water supply structures. After a long period of operation, hydraulic structures continue to operate without scheduled repairs, so it is necessary to perform technical reconstruction of the structure on the basis of innovative, as well as previously proven repair technologies. Most of the long-term operated hydraulic structures in Russia are in unsatisfactory condition, requiring modernization and reconstruction. Volumetric anti-filtration geotextile coating is used for technical restoration of long-term water supply structures that have failed. The volumetric cellular structure is filled with soil and has a variable height of the edge from the ridge to the bottom of the slope. Operational reliability and durability of the volumetric coating are provided by a cellular structure with a variable ridge height, to eliminate the formation of landslides in the underlying soil and in the filling, as well as the loss of water for filtration. A solid-state model of the stress-strain state of a bulk anti-filtration geotextile coating was constructed. The number of elements and the number of units of the ensemble was 127830 and 102740, respectively. The source information was encoded in terms of the increment method, taking into account the fragmentary representation of a three-dimensional anti-filtration geotextile coating with a variable edge height in the form of simple geometric objects-plates. The work of the coating from the load from its own weight and filling the volume cells of the soil at various parameters was numerically modelled. The results obtained are adequate to the calculations and do not exceed the operational parameters of the design. Processing of the obtained simulation results showed the presence of minor displacements, both horizontally and vertically along the structure, which indicates the presence of a large margin of safety of the bulk anti-filtration geotextile coating.