土工布加筋土的三轴蠕变试验研究

发布时间：2018-01-12 05:13

本文关键词：土工布加筋土的三轴蠕变试验研究　出处：《岩石力学与工程学报》2016年06期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Based on the large size triaxial creep test instrument, the triaxial creep tests of plain soil and reinforced soil with different confining pressures and reinforced layers were carried out, and the different deflection stresses were obtained. This paper presents a PH empirical model which can describe the relationship between stress and strain time of reinforced soil and the creep characteristics of soil under different reinforcement layers and the mechanism of reinforcement to soil reinforcement. The relationship between the model parameters and the number of stiffened layers and the deflection stress is obtained. Based on the Burgers element model, a reinforcement effect coefficient is proposed to evaluate the influence of reinforcement on soil stiffness. The results show that the reinforcement effect increases linearly with the increase of the number of reinforcement layers. Compared with the method of increasing compaction degree to reduce the post-work deformation in high fill engineering, it is more effective to increase the reinforcement in the packing.
【作者单位】：西安理工大学岩土工程研究所;
【基金】：国家自然科学基金资助项目(51308456) 陕西省自然科学基础研究计划项目(2013JQ7022,2015JM5175)~~
【分类号】：TU41
【正文快照】： 1引言近年来,国内外关于加筋材料、加筋土的相关力学特性及工程应用的研究成果较多,C.Tang等[1]研究了聚丙烯纤维和水泥加筋对黏土的强度影响和力学机制。M.X.Zhang等[2-5]提出了立体加筋土的概念,并通过大量三轴试验研究了不同加筋方式对砂土强度的影响程度,探讨了不同加筋高

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