|Table of Contents|

Study on critical dynamic stress and cumulative deformation characteristics of phosphogypsum stabilized soil(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年06期
Page:
170-180
Research Field:
岩土工程
Publishing date:

Info

Title:
Study on critical dynamic stress and cumulative deformation characteristics of phosphogypsum stabilized soil
Author(s):
CHEN Kaisheng;  ZHANG Kun;  HU Xing;  WANG Lei
(College of Civil Engineering, Guizhou University, Guiyang 550025, Guizhou, China)
Keywords:
phosphogypsum stabilized soil;  improvement mechanism;  critical dynamic stress;  cumulative deformation;  dynamic strength
PACS:
TU446
DOI:
10.19815/j.jace.2022.01006
Abstract:
In view of the resource waste of phosphogypsum and the special engineering characteristics of red clay, the fatigue characteristics and improvement mechanism of phosphogypsum stabilized soil were studied by SDT-20 dynamic triaxial test with cement(lime)as curing agent. The cumulative deformation model and critical dynamic stress model were established, and the dynamic strength index of the mixture was obtained. The results show that the cumulative deformation characteristics increase significantly with the increase of dynamic stress amplitude and confining pressure, and the deformation of plain red clay and phosphogypsum stabilized soil experiences three stages including stable type, critical type and failure type. The critical dynamic stress increases linearly with the increase of confining pressure. Reducing the level of dynamic stress and increasing confining pressure can improve the ability of subgrade to resist instability. The dynamic shear strengths of lime phosphogypsum stabilized soil and cement phosphogypsum stabilized soil is significantly higher than that of plain red clay, and the increase value of dynamic shear strength of cement phosphogypsum stabilized soi is greater than that of lime phosphogypsum stabilized soil. The strength enhancement of phosphogypsum stabilized soil is the joint action of cement(lime)and phosphogypsum. The cement(lime)reacts to form calcium silicate hydrate(C—S—H gel), the phosphogypsum reacts to form ettringite AFt, and the two are intertwined to form a spatial network structure.

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Last Update: 2023-12-01