Strengthening technology and modeling of dams from reinforced soil

Abstract

The aim of the work is to develop a methodology and technique for modeling reinforced soil for further use and application in hydraulic facilities to ensure their stable operation. The objectives of the study are to substantiate the efficiency of using dams of large canals made of reinforced soil at hydraulic structures of pumping stations of the Republic of Uzbekistan, taking into account local conditions, developing recommendations for the rational design of retaining walls and dams from reinforced soil. To achieve this goal, it is necessary to solve the problems of coordinating the operating modes of the pumping station with the introduction of retaining walls and dams from reinforced soil on full-scale structures. The article discusses the implementation of the method of building them in the management of water distribution on irrigation systems in Bukhara and Kashkadarya regions. The theoretical foundations of modeling and design of test stands for the study of volumetric models of dams of large channels made of reinforced soil have been developed. Studies on volumetric models of dams made of reinforced soil were carried out in compliance with the criteria of approximate similarity, which made it possible to obtain new physical ideas about the operation of structures at the stage of destruction. The conducted studies of the models of the built-up part of the dams made it possible to estimate the bearing capacity by the value of the breaking load of the reinforced model to the value of the breaking load of the unreinforced (reference) model. The presence of reinforcement in the soil increases the bearing capacity of the model in comparison with the unreinforced one: even with the volume percentage of reinforcement μ = 0.064%, the hardening coefficient is equal to Chard = 2.60; with μ = 0.032% Chard = 1.70-2.07. With the same percentage of reinforcement μ = 0.032%, an increase in the vertical spacing of the reinforcement leads to a decrease in the bearing capacity by 12-15%. A more even arrangement of reinforcing elements in the ground (close vertical and horizontal spacing between them Sh ≈ Sv ) ensures the maximum bearing capacity of a reinforced soil structure.

Vibrodiagnostic method of water pump control

“…On the pump chamber, the main source of increased vibration is the hydrodynamic imbalance and flow heterogeneity in the pump. The nature of these two defects is the same -an uneven gap between the blades and the chamber, differences in pitch and angle between the blades, length, and thickness, or their operational uneven wear, and the vibration manifestation is different [14].…”

The adjustment work canal on the Amudarya in the areas of the damless water intake

“…In the studied area, as a result of the displacement of the main stream of the river in the head water intake at a length of 1200 m, the flow concentrated in one canal, the width of which, depending on the water discharge, varied from 250 to 500 m. An island located between the right and middle canals at a length of 2000 m, displaced to the left, towards the middle canal by 200-280 in the head part of the left canal formed a large sandbank. There was also an expansion to 1000 m and an extension to 1200 m of the island located between the middle and left canals [13][14][15][16]. Due to the systematic cleaning of the middle canal, the discharge in it is 80 ... 85 % of the total discharge of the river.…”

Reliability Analysis of High Concrete-Face Rockfill Dams and Study of Seismic Performance of Earthquake-Resistant Measures Based on Stochastic Dynamic Analysis

“…In order to study the influence of GRSS on the stability of dam slope during earthquakes, based on the existing research [9][10][11] and with reference to the common parameter settings in engineering [48], the vertical spacing of GRSS layers (S v ) was set at 4 m and the length (L max ) was set at 50 m, for comparison with the original dam slope as a typical work condition. The random dynamic response of the dam slope was analyzed, and the seismic performance of the proposed measure was evaluated from the perspective of reliability.…”

“…Yang [10] evaluated the seismic stability of reinforced earth-rock dams, based on the upper-bound theorem of limit analysis, and studied the influence of geogrid length on seismic performance. Glovatsky et al [11] developed the theoretical foundations for the modeling and design of test stands in the…”