刘博,黄卓
LIU Bo,HUANG Zhuo

• 1:长安大学地质工程与测绘学院

摘要(Abstract)：

基于颗粒流软件PFC2D模拟了纤维混凝土试样劈裂抗拉试验，探究了在加入纤维前后混凝土的力学性能，进一步分析了纤维长度、纤维掺入量以及摩擦因数、变形模量等细观参数对纤维混凝土力学性能的影响。主要结论如下：纤维的加入可以有效改善混凝土裂隙的发展，提高混凝土内部颗粒间的黏结强度，进一步提高混凝土的强度以及延展性；随着纤维长度的增加，纤维与混凝土骨料颗粒之间的接触面积增加，加大了与混凝土内部骨料的接触黏结，纤维混凝土的抗拉强度也随之增加；随着纤维含量的增加，纤维混凝土的抗拉强度是先增加再降低，说明纤维含量对于抗拉强度的增强效果是有限的；纤维的细观参数如摩擦因数和变形模量都对纤维混凝土抗拉强度的影响不大。
The splitting tensile test of fiber reinforced concrete samples was simulated based on the particle flow software PFC2D. The mechanical properties of concrete before and after adding fibers were explored.The influences of fiber properties such as fiber length, fiber content and mesoscopic parameters, friction factor, deformation modulus on the mechanical properties of fiber reinforced concrete were further analyzed.The main conclusions are as follows: the addition of fiber can effectively improve the development of cracks in concrete, improve the bonding strength between particles in concrete, and further improve the strength and ductility of concrete. With the increase of fiber length, the contact area between the fiber and the concrete aggregate particles increases, which increases the contact bond with the aggregate in the concrete,and the tensile strength of the fiber concrete also increases. With the increase of fiber content, the tensile strength of fiber reinforced concrete increases first and then decreases, indicating that the effect of fiber content on tensile strength is limited. The fiber's mesoscopic parameters such as friction factor and deformation modulus have little effect on the tensile strength of fiber reinforced concrete.

关键词(KeyWords)： 纤维混凝土;离散元模拟;纤维长度;纤维掺入量;劈裂抗拉试验
fiber concrete;discrete element simulation;fiber length;fiber content;split tensile test

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 刘博,黄卓
LIU Bo,HUANG Zhuo

DOI: 10.16090/j.cnki.hcxw.2022.06.017

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