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摘要: 动力循环荷载作用下长期变形是工程实践中值得关注的问题。由于试验条件的限制，目前对于动力长期变形研究取得的成果比较有限，而静力作用下的流变成果则相对较多。本文以天津滨海新区海积软土为研究对象，利用TSS10土体三轴流变试验仪和GCTS空心圆柱扭剪仪，对其分别进行流变试验以及大数目循环动荷载试验。试验数据分析表明，同围压条件下，当动应力与静偏应力相等时，动力累积变形与静力长期变形具有相似性，区别在于动力累积变形量略大于静力流变变形。基于此，以静力流变元件模型为基础，同时计算同条件下动静荷载作用下变形差值，建立动力长期变形预测公式，并对试验数据进行验证，结果表明该预测公式较为合理，可为相关工程建设提供理论支持。Abstract: The long-term deformation under dynamic cyclic loading is a problem drawing attention in engineering practice. Due to the limitations of the experimental conditions, the results obtained in the study of long-term dynamic deformation are limited, but the rheological results are relatively more. In this work, the marine soft soil of the Tianjin Binhai New Area is used as the research object, and the TSS10 soil triaxial rheological test for the rheological test and the GCTS hollow cylinder torsional shear apparatus for a large number of dynamic cyclic loading tests are carried out. The experimental results show the under the same confining pressure, when the dynamic stress is equal to the static stress, the dynamic accumulative deformation is similar to that of the long-term static deformation, and the difference is that the dynamic accumulative deformation is slightly larger than that of the static deformation. Based on the static rheological element model, together with calculating deformation difference between the dynamic and static load under the same condition, the long-term dynamic deformation prediction formula is established and used to verify the experimental data. The results show that the prediction formula is more reasonable, which can provide theoretical support for engineering constructions.
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Key words:
- soft clay /
- static loads /
- rheology /
- long-term dynamic deformation /
- forecasting model
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