Experimental study on mechanical properties of high sand content missing-grades soil under seepage failure
[Objective]The loss of particles and damage to the foundation structure caused by the seepage process often have seri-ous consequences for wading projects.To study the changes in mechanical properties of high sand-content gap-graded soil before and after seepage failure,[Methods]soil internal erosion stress path triaxial apparatus was developed to simulate the seepage failure process under different stress states.The apparatus is used to evaluate the change of seepage failure process and the re-sponse of soil mechanical properties.[Results]The experimental result showed that under low stress conditions,gap-graded soils exhibit a substantial increase in sand boiling volume and a significant reduction in peak strength.[Conclusion]The conclusion highlights that under the influence of non-uniformly distributed effective stresses,gap-graded soils undergo notable changes in permeation failure and mechanical behavior.The loss of fine particles leads to a distortion of the soil's mechanical strength curve,revealing characteristics of strain hardening and volumetric shear dilatation.The stress path had a significant influence on the stress-strain relationship of defective soil.The normalized result of stress paths for high sand-content defective soil differed signifi-cantly from those of common sandy soil due to the seepage damage process.These research findings can provide reference for ana-lyzing the changes in mechanical strength of soil caused by seepage failure and preventing and controlling seepage failure disasters in water conservancy projects.
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