聚丙烯纤维加筋砂土的剪胀特性

孔玉侠; 沈飞凡; 王慧娟

doi:10.11779/CJGE201812012

聚丙烯纤维加筋砂土的剪胀特性 English Version

南京工业大学岩土工程研究所,江苏南京 211816

基金项目: 国家自然科学基金项目（11402109）; 江苏省自然科学基金项目（BK20130909）

详细信息

作者简介:
孔玉侠(1981- ),女,工学博士,主要从事土的本构关系及其数值计算方面的研究工作。E-mail：kongyuxia@njtech.edu.cn。

中图分类号: TU43
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出版历程
- 收稿日期: 2017-09-03
- 发布日期: 2018-12-24

Stress-dilatancy properties for fiber-reinforced sand

Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 211816, China

摘要

摘要: 随机分布的聚丙烯纤维在土体中彼此交错形成网状,可显著提高砂土的抗剪强度,减少其峰值强度折减。描述土体剪胀规律的剪胀方程是建立纤维加筋土的本构模型的核心。以聚丙烯纤维加筋南京细砂为主要研究对象,通过不同围压下的常规三轴压缩试验,研究了不同纤维质量百分比含量对南京细砂强度、变形以及剪胀特性的影响。对比聚丙烯纤维加筋砂土与纯砂土的应力应变关系和强度特性,分解出聚丙烯纤维对砂土的内在约束应力。将外力克服剪胀阻力需要做的额外功分解为由土颗粒运动和纤维变形两部分所消耗的能量,利用纤维对土的内在约束应力表示与加筋纤维有关的耗散能,基于最小比能原理建立了聚丙烯纤维加筋砂土的剪胀方程,揭示了聚丙烯纤维加筋砂土的特殊剪胀特性。经过对比发现常规三轴压缩试验结果与模型结果具有良好的一致性。
- 砂土 /
- 纤维加筋 /
- 应力剪胀方程
Abstract: It is observed that randomly distributed polypropylene fibers act to interlock particles and thus improve the mechanical behavior of the reinforced soils. The polypropylene fiber inclusion clearly increases the shear strength of soils, and reduces the loss of post-peak strength. The stress-dilatancy relationship can be employed as the foundation to develop a constitutive model for polypropylene fiber-reinforced (PFR) soils. In this study, a number of conventional triaxial compression tests are carried out to investigate the effect of randomly distributed fiber reinforcements on the stress-dilatancy relationship of Nanjing sand. A new parameter, $\sigma_{FR}$ , representing the reinforcing effect of fibers in Mohr-circle space is introduced to describe the behaviors of PFR sand. When a polypropylene fiber-soil assembly dilates in response to the applied shear deformations, the work done by the driving stress will be dissipated by the particle sliding and the fiber deformation. The work dissipated by the polypropylene fiber deformation can be expressed by introducing $\sigma_{FR}$ . Based on the minimum rate of internal work assumption, the stress-dilatancy relationship is deduced for fiber-reinforced sand. It is shown that the predicted results are in good agreement with the experimental ones.
- sand /
- fiber reinforcement /
- stress-dilatancy relationship

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参考文献(30)

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聚丙烯纤维加筋砂土的剪胀特性 English Version

作者简介: 孔玉侠(1981- ),女,工学博士,主要从事土的本构关系及其数值计算方面的研究工作。E-mail：kongyuxia@njtech.edu.cn。

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出版历程

Stress-dilatancy properties for fiber-reinforced sand

期刊类型引用(11)

其他类型引用(16)

计量

出版历程

目录

作者简介:
孔玉侠(1981- ),女,工学博士,主要从事土的本构关系及其数值计算方面的研究工作。E-mail：kongyuxia@njtech.edu.cn。