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基于自行研发的大尺寸三轴蠕变试验仪,开展不同围压、加筋层数的素土和加筋土的三轴蠕变试验,得到不同偏应力、不同加筋层数下土体的蠕变特性和加筋对土体加固的机制,提出一种可以描述加筋土“应力–应变–时间”关系的PH经验模型,得到所获取的模型参数与加筋层数和偏应力的关系;并基于Burgers元件模型,建议一种加固效果系数来评价加筋前后对土体刚度的影响程度,结果表明:随着加筋层数的增加,其加筋效果呈线性增加,与高填方工程中以增加压实度的方法来减小工后变形相比,在填料中增加筋材具有更佳效果。
Based on the self-developed large-size triaxial creep tester, the triaxial creep tests of plain soil and reinforced soil with different confining pressures and reinforced layers are carried out to obtain the soil with different deviatoric stress and different reinforced layers Creep characteristics and reinforced mechanism of soil reinforcement, this paper presents a PH empirical model that can describe the “stress-strain-time” relationship of reinforced soil. The obtained model parameters are compared with those of reinforced layer and deviatoric stress Based on the Burgers model, a kind of reinforcement effect coefficient is proposed to evaluate the influence of reinforcement on soil stiffness before and after reinforcement. The results show that the reinforcement effect increases linearly with the increase of reinforcement number, Filling projects to increase the degree of compaction method to reduce post-processing deformation compared to adding filler in the filler has a better effect.