Purpose: to study the effect of nonlinear soil movement in a deep-laid pit when designing an above-ground reservoir for irrigation as part of a system for regulating the precipitation runoff in the mountain-piedmont zone, subject to the technical regulations on the structure safety and subsequent safe operation.
Materials and methods: the construction of a deep-laid pit in difficult geological design conditions in the mountain-piedmont zone of a hydraulic structure, which is responsible in terms of safety, namely, a system for regulating the rainfall runoff for irrigating agricultural land, prompted us to a more detailed study of measures to prevent soil uplift. In the analysis two conditions were modeled, namely, the construction of a deep-laid pit for an above-ground reservoir in the mountain-piedmont zone for irrigation without measures to prevent soil uplift and with appropriate measures.
Results and discussion: when analyzing the results of soil uplift calculation without taking additional measures, it is stated that the soil uplift has a negative impact on the reservoir and in this case the hydraulic structure safety is not ensured. As an alternative option, the use of pit sheathing with a Larsen sheet pile model VL606a is considered. As a result of numerical modeling using the MIDAS software product, which made it possible to take into account all the factors necessary for solving such problems, it was found that the indicators are included in the confidence zone and, as a result, this structure will meet all safety requirements.
Conclusions: when constructing a deep-laid pit without additional measures, the soil uplift is 52.5 cm, and when arranging additional measures in the form of a sheet pile – 1.97 cm, which must be taken into account when designing an above ground reservoir for irrigation as part of a system for regulating the precipitation runoff in a mountain-piedmont zone.
doi: 10.31774/2712-9357-2021-11-3-78-94
irrigation, reservoir, fresh water, hydraulic structures, sheet pile, mathematical modeling, nonlinear soil movement
Degtyareva O. G., Vasilyev S. M. The use of deep-laid pits when using precipitation runoff for irrigation in the mountain-piedmont zone // Land Reclamation and Hy-draulic Engineering [Elec-tronic resource]. 2021. Vol. 11, no 3. P. 78–94. URL: http:www.rosniipm-sm.ru/en/article?n=1215 (date of access: 18.08.2021). doi:10.31774/2712-9357-2021-11-3-78-94
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