Guan'gai paishui xuebao (Aug 2023)
Optimizing the Materials for U-shaped Channel in Solidified Soda-saline Soils
Abstract
【Objective】 Saline soil needs reinforcement in constructing channels. The objective of this paper is to investigate the engineering characteristics of a new material used to reinforce saline soil to resolve issues such as dissolution, erosion and water wastage in west Jilin province. 【Method】 A house-made frost-crack resistant agent was used in the study. It was mixed with the soil at ratios ranging from 20% to 45%, with soil water content varying from 14% to 20%. The hydraulic and mechanical properties of each sample were measured using unconfined compressive strength test, freeze-thaw test, and permeability test, from which we determined the optimal mixing ratio. The ABAQUS software was then used to analyze the stress and displacement of a 2 m U-shaped channel under different operating conditions. 【Result】 The optimal material ratio was 40% with the soil moisture being 16%. Its strength was 14.91 MPa at the optimal age of 28 days. The specimens lost less than 5% of its quality after undergoing more than 200 indoor freeze-thaw cycles; its hydraulic conductivity was 1×10-7 cm/s. The numerical simulations revealed that the 2 m U-shaped channel experienced a maximum principal stress of 87.4 kPa and maximum displacement of 0.08 mm under a two-point lifting of the bottom force. Under full water operating conditions, the maximum principal stress was 94.32 kPa, and the maximum displacement was 2.85 mm. Considering the effect of frost heave, the maximum principal stress was 312 kPa, and the maximum displacement was 17 mm. 【Conclusion】 Under the test conditions, the optimal agent ratio was 40%. This ratio reduced the displacement deformation of the U-shaped channel and improved its stability. These findings provide guidance for constructing U-shaped channels in saline soils in western Jilin province and regions with similar environments.
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