Influences of basalt fibers on characteristics of shrinkage cracking of clay
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摘要: 黏土的膨胀收缩会导致裂缝的产生，裂缝的产生会显著改变其水理-力学性能，常引起各类工程地质问题。为了研究玄武岩纤维对黏土抗裂性的改善作用，进行了室内试验，对取自呼和浩特市郊区某建筑工地黏土，共设计5组试样以定量分析纤维掺量对黏土开裂的影响，并采用数字图像处理技术进行了分析，并结果表明：土体试样的开裂可分为三个阶段，分别为裂隙产生阶段、裂隙网格形成阶段、裂隙宽度扩展阶段；在掺入纤维的土体试样中，其裂隙之间的正交性会发生改变，并会产生更多的死端裂隙；玄武岩纤维抑制了土体的开裂，降低了裂隙宽度、裂隙比，随着纤维含量的增加，土体试样首次开裂所对应的含水率减小。Abstract: The expansion and contraction of clay can lead to the formation of cracks, which can significantly alter its hydraulic and mechanical properties and often cause various engineering geological problems. In this study, the indoor experiments are conducted to investigate the improvement effects of basalt fibers on the cracking resistance of clay. A total of 5 sets of samples are designed to quantitatively analyze the effects of fiber content on clay cracking. The soil is taken from a construction site in the suburbs of Hohhot and analyzed using the digital image processing technology. The final results show that the cracking of the soil samples can be divided into three stages: crack generation stage, crack grid formation stage, and crack width expansion stage. In the soil samples mixed with fibers, the orthogonality between the cracks will change, and more dead end cracks will be generated. Through the researches, it is found that the basalt fibers inhibit the cracking of soil, reducing the width and ratio of cracks. With the increase of the fiber content, the moisture content corresponding to the first cracking of the soil samples decreases.
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Keywords:
- basalt fiber /
- moisture content /
- clay /
- crack ratio /
- crack width
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表 1 土的基本物理参数
Table 1 Basic physical parameters of soil
土体类型 Gs 塑限wP/% 液限wL/% 塑性指数IP 颗粒成分/% 砂粒 粉粒 黏粒 黏土 2.71 25.3 53.7 28.4 48.19 26.35 25.46 
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