【摘 要】
：
Swelling deformation of expansion soil due to moisture absorption often leads to safety problems of engineering.Taking Nanyang mid-expansive soil as the res
【机 构】
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CollegeofCivilandArchitectureEngineeringWuhanUniversity,China;KeyLaboratoryofGeotechnicalMechanicsan
【出 处】
：
International Conference on Science and Technology of Hetero
论文部分内容阅读
Swelling deformation of expansion soil due to moisture absorption often leads to safety problems of engineering.Taking Nanyang mid-expansive soil as the research object, the relationship between the expansion rate after sufficient moisture absorption, the final water content and the initial water content, the cover load have been studied through expansion experiments at the state of K0 stress.By improving the water inlet control system and the measurement of external volumetric strain, the triaxial expansive experiment has been realized.And the relationship between the volume expansion rate after sufficient moisture absorption, the final water content and the initial water content, the average principal stress has been obtained through the triaxial expansive test.Experimental results show that the volume expansion rate and final water content in different stress state decrease while the cover load or the average principal stress increases, which has a good linear relationship in semi-logarithmic coordinate.Through theoretical derivation, the unified relationship and expression of expansion models in different stress state are established.With this expansion model, the expansive constitutive relation of expansive soil with any water content can be obtained.Operation of this expansion experiment is simple, and the expression of this model is relatively concise, whose parameters are of definite physical meanings.This model can be used in numerical calculation and simplified calculation, which has good practical value.
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