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考虑剪应力水平和土体干密度影响的锚-土界面剪切蠕变模型
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Creep Model for Anchor-soil Interface Considering Shear Stress and Soil Dry Density
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    岩土锚固工程中,土体密实度影响着锚-土界面剪切蠕变特性. 为研究不同干密度土层中灌浆锚杆锚固体-红土界面的剪切蠕变特性,研制了一套钻孔成孔的锚固单元体试样制作装置,制备了不同干密度的锚固单元体试样. 利用自行设计制作的锚-土界面剪切蠕变特性测试系统对试样进行分级加载,并按照陈宗基等提出的蠕变曲线处理方法,得到了不同干密度下锚-土界面分别加载下的蠕变曲线,再采用等时曲线法获得了不同干密度下锚-土界面长期抗剪强度. 选取不同干密度试样中部分应力水平下的蠕变曲线,分别采用双曲线模型对其等时曲线进行回归分析并建立出相应的蠕变模型,再通过建立蠕变模型参数与土体干密度的经验关系,得到可同时考虑剪应力水平和土体干密度影响的锚-土界面剪切蠕变模型. 结果表明,本文模型对已参与和未参与建模的蠕变曲线的预测精度均较高.

    Abstract:

    In geotechnical anchorage engineering,the soil density has a influence on the shear creep behavior of anchor-soil interface. A special device for preparing the element anchor specimens in drilling method was designed and made to investigate the influence of soil dry density on anchor-soil interface shear creep behavior. Several specimens with different soil dry densities were prepared by using this device. Creep loads were applied by incremental step using a self-designed anchor - soil interface shear creep testing system. A cluster of interface shear creep curves in various stress levels for those specimens with different soil dry densities was obtained by T-K Tan's method. Anchor-soil interface long-term shear strengths in different soil dry densities were obtained by the isochronal curves method. Creep curves under partial stress levels of each specimen were selected and translated into isochronal curves. Creep models for each different soil dry density specimen considering shear stress were established by regression analysis for those isochronous curves using a hyperbolic model. The creep model for the anchor-soil interface considering the effect of shear stress and soil dry density was obtained by establishing an empirical relationship between creep model parameters and soil dry density finally. The prediction results show that the proposed creep model has good accuracy for both participated and no participated creep curves in modeling.

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陈昌富?覮,温永凯,朱世民.考虑剪应力水平和土体干密度影响的锚-土界面剪切蠕变模型[J].湖南大学学报:自然科学版,2021,(9):1~9

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  • 在线发布日期: 2021-09-28
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