Study on mechanical properties and mechanism of dual polymer modified dispersive soil
In order to solve the safety problem of dispersive soil in the construction of water diversion and irrigation other projects,this paper takes the dispersive saline soil in the west of Jilin Province as the research object,studies the improvement effects of synergistic treament with lignin and xanthan gum high molecular polymers on the dispersivity and mechanical properties of dispersive soil,and analyzes the influence of freeze-thaw cycle on the dispersivity and mechanical properties of improved soil,and explain the improvement mechanism from a microscopic perspective.The results showed that the dispersity of the improved soil was significantly reduced,and the strength was significantly improved.Among them,3％lignin and 3％Xanthan gum were treated and cured together for 28 days,and the unconfined compressive strength of the improved soil reached 171.12 kPa,about 2.5 times higher than the strength of the undisturbed soil.In the improved ratio of the design of experiments,this ratio has the most significant improvement in the comprehensive performance of the dispersive soil,and the effect of resisting freeze-thaw degradation is also the best.Micro-structure analysis shows that lignin fiber plays a three-dimensional grid like bridging role in the improved soil,and the unique bonding ability of Xanthan gum also makes the soil particles more closely connected.The synergistic treatment of lignin and Xanthan gum has obvious advantages in dispersive soil,which provides a theoretical basis for the improvement of dispersive soil in practical engineering construction.
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