纤维增强的岩石砂填充材料的曲特性和损伤演变
Yanan Sun1, Bing Liang1, Tao Liu2
1School of Mechanics & Engineering, Liaoning Technical University, Fuxin, 123000, Liaoning, China.
Scientific reports
|October 10, 2024
概括
聚烯 (PP) 纤维通过提高性和抗裂性质来增强纤维增强的岩沙填充材料 (FAB). 最佳的PP纤维长度和分数显著提高曲强度,并延迟裂传播.
科学领域:
- 材料科学 材料科学 材料科学
- 地质技术工程 地质技术工程
- 采矿工程 采矿工程 采矿工程
背景情况:
- 填充控制沉降和处置矿区的固体废物.
- 增强的性和抗裂纹性能对于复杂负载下的回填材料寿命至关重要.
- 聚烯 (PP) 纤维为提高回填性能提供了一个潜在的解决方案.
研究的目的:
- 研究PP纤维对岩沙填充材料 (FAB) 机械性能和故障机制的影响.
- 为了确定最佳的PP纤维体积分数和长度,以提高性能.
- 分析纤维增强FAB中的裂纹传播和损伤演变.
主要方法:
- 在具有不同PP纤维含量的FAB上进行了四点曲和单轴压缩测试.
- 数字图像相关性 (DIC) 用于监测移位和菌株演变.
- 采用声波发射 (AE) 技术来检测和分析裂的开始和传播.
主要成果:
- 压力强度随着PP纤维含量的增加而下降,而四点曲强度最初增加,然后下降,在0.6%的PP纤维体积分数处是最佳的.
- 聚乙烯纤维,特别是长度为9毫米的纤维,显著增加了四点曲强度 (高达81.62%),并有效控制了位移和裂纹的发展.
- 较长的PP纤维 (9毫米) 显示出优越的裂纹延伸延迟特征,由更高的AE环数证明.
结论:
- 聚烯纤维可以有效地提高性和抗裂纹性质的岩沙填充材料.
- 建议最佳PP纤维含量为0.6%和长度为9毫米,以最大限度地提高曲强度和抗裂性.
- 这项研究为采矿和土木工程应用中应用PP纤维增强回填材料提供了理论基础.
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