短纤维在纤维增强水泥稳定土中的拉拔行为

Jia Sun, W. Duan, Qiang Li
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引用次数: 0

摘要

短纤维增强水泥土的破坏机制取决于纤维与水泥土基质的相互作用。通过实验研究和数值模拟,揭示了纤维增强的机理。首先,通过单纤维拉拔试验,结果表明:不同埋置长度下单纤维的最大拉伸力随龄期的发展而增大;在此基础上,建立了单纤维与水泥稳定土相互作用的三维有限元模型。数值结果与实验结果的对比表明,黏性界面参数对单纤维与水泥稳定基体的相互作用有重要影响。引入适当的内聚模型,数值结果与实验结果吻合较好。该纤维能抑制水泥土膨胀,提高水泥土的抗裂性和长期强度。近年来,为了获得更好的加固效果,大量研究者通过实验对水泥稳定土的加固公式进行了研究[1,2,3]。实验表明,增强效果主要取决于六个因素:纤维体积分数、纤维取向、纤维形状、纤维材料性能、基体材料性能、纤维与基体表面接触特性[4]。而对纤维与基体相互作用机理的认识依赖于单纤维拉拔试验,这是确定纤维作用及其增强效果的关键问题,也是研究人员和工程技术人员一直关注的重点。为了精确测量单纤维拔出曲线,许多研究者开发了各种先进的精密仪器进行单纤维拔出试验[5,6]。为了进一步了解纤维与基体的相互作用,Cox引入了剪切滞后模型,建立了纤维与基体相互作用的数学模型[7],求解复合材料的应力场和应变场。基于剪切滞后模型或更严格的纤维与基体相互作用的三维模型,以下研究者获得了大量的研究成果[8,9,10]。众所周知,界面粘滞效应对纤维与基体相互作用分析具有重要意义。Hsueh[11]考虑了界面中的粘性效应和纤维拉拔过程中因泊松效应引起的径向收缩。这些理论分析只适用于简单的形状和边界条件,不适用于更复杂的条件。Morrison采用预设剥离长度的方法建立二维有限元模型,计算纤维的剥离结果和拔出力,发现断裂能量释放率G和断裂长度b对破坏模式的影响是显著的[12]。Povirk基于拔出率的摩擦本构关系进行了单纤维准静态分析,反映了纤维与基体界面摩擦速度的减弱[13]。以上对纤维与基体相互作用的分析忽略了界面处的粘性接触条件,仿真结果有待进一步完善。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Behavior of a Short Fiber Pull-out from Fiber Reinforced Cement Stabilized Soil
Failure mechanism of short fiber-reinforced cement-stabilized soil depends on the interaction between the fiber and the cement-stabilized soil matrix. And the mechanism of fiber reinforcement is revealed by experimental studies and numerical simulations. Firstly, by using the single fiber pull-out test, the results show that the maximum tensile force of single fiber under different embedding lengths increases with the development of age. Then based on a cohesive model, a three-dimensional finite element model is established to simulate the interaction between single fiber and cement-stabilized soil. The comparisons of numerical results and experimental results reflect that viscous interface parameters have vital effects on the interaction between single fiber and cement-stabilized matrix. Introducing the proper cohesive model, numerical results agree well with the experimental results better. Introduction The fibers can inhibit the expansion of cement-stabilized soil, also can improve crack resistance and long-term strength. In recent years, a large number of researchers studies the cement-stabilized soil reinforcement formula [1,2,3] by means of experiments in order to get better effects. According to the experiments, the reinforcement effects mainly depends on six factors: fiber volume fraction, fiber orientation, fiber shape, fiber material properties, matrix material properties, and surface contact characteristics of fiber and matrix [4]. And the understanding of the mechanism of fiber and matrix interaction relies on the single fiber pull-out test, which is a critical problem to decide the role of fiber and its reinforcement effects, and it is also the key point that researchers and engineers have been concerning about. For the accurate measurement of single fiber pull-out curves, many researchers have developed a variety of advanced precision apparatus for single fiber pull-out tests [5,6]. For further insight of fiber and matrix interactions, Cox introduced the shear lag model to established the mathematical model of fiber and matrix interaction [7], which solving stress field and strain field of the composite. Based on the shear lag model or more rigorous three-dimensional model of interaction between fiber and matrix, a large number of research results are obtained by the following researchers [8,9,10]. It is well known that the interfacial viscous effects is very important for the interaction analysis between fiber and matrix. Hsueh [11] considered viscous effects in the interface and the radial shrinkage in fiber pull-out process caused by the Poisson effect. These theoretical analyses are only applicable to simple shapes and boundary conditions, they are inconvenient for application in more complicated conditions. Morrison used the method of preset debonding length to establish the two-dimensional finite element model to calculate the results of fiber debonding and pull-out force, and he found that the effects of fracture energy release rate G and fracture length b was significant for failure modes [12]. Povirk developed a single fiber quasi static analysis depending on friction constitutive relation of pull-out rate, reflecting fiber and matrix interface friction velocity weakening [13]. The above analysis of the interaction between fiber and matrix ignored the viscous contact condition at the interface, and the simulation results needed to be improved further.
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