| 易富*,周芳颜,杜常博.聚丙烯纤维加筋尾矿剪切特性试验及模型研究[J].实验力学,2023,38(6):789~799 |
| 聚丙烯纤维加筋尾矿剪切特性试验及模型研究 |
| Experimental and model study on shear characteristics of polypropylene fiber reinforced tailings |
| 投稿时间：2022-10-04 修订日期：2022-11-14 |
| DOI：10.7520/1001-4888-22-248 |
| 中文关键词: 聚丙烯纤维 尾矿 直剪试验 抗剪强度 Duncan-Chang模型 |
| 英文关键词:polypropylene fiber tailings direct shear test shear strength Duncan-Chang model |
| 基金项目:国家自然科学基金项目(51774163)；辽宁省教育厅青年基金资助项目(LJKQZ2021153)；辽宁工程技术大学学科创新团队资助项目(LNTU20TD-12) |
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| 中文摘要: |
| 为研究聚丙烯纤维加筋尾矿作为路基填料的可行性，通过大型直剪试验分析不同法向应力下聚丙烯纤维掺量及含水率对尾矿抗剪性能的影响。试验结果表明：纤维掺量对黏聚力的影响比内摩擦角要大，加筋尾矿的黏聚力随纤维掺量的增加先增大后减小，最优掺量为0.3%；随含水率增大，加筋尾矿的黏聚力呈现先增大后减小的趋势，最优含水率为7%，受含水率影响加筋尾矿内摩擦角的变化幅度在5°以内。纤维加筋指数可以反映纤维掺量及含水率对加筋效果的影响，它与黏聚力的关系符合幂函数特征，对内摩擦角的影响不大。通过引入纤维加筋指数来修正Duncan-Chang模型，建立了模型参数与纤维加筋指数之间的数学关系式，破坏比和参数K与纤维加筋指数呈现二次函数的特点，参数n受纤维加筋指数影响较小。修正后模型的预测曲线可准确反映加筋尾矿的真实剪切特性，并能对其在路基工程中的应用提供参考和预测分析。 |
| 英文摘要: |
| In order to study the feasibility of polypropylene fiber reinforced tailings as roadbed filler, the influence of polypropylene fiber content and water content on the shear performance of tailings under different normal stresses was analyzed by large-scale direct shear test. The test results show that: The influence of fiber content on cohesion is greater than that of internal friction angle. The cohesion of reinforced tailings increases first and then decreases with the increase of fiber content, and the optimal content is 0.3%. With the increase of water content, the cohesion of reinforced tailings increases first and then decreases. The optimal water content is 7%, and the variation range of the internal friction angle of reinforced tailings affected by water content is within 5°. The fiber reinforcement index can reflect the influence of fiber content and water content on the reinforcement effect. Its relationship with cohesion conforms to the power function characteristic, and has little effect on the internal friction angle. The Duncan-Chang model is modified by introducing the fiber reinforcement index, and the mathematical relationship between the model parameters and the fiber reinforcement index is established. The failure ratio and the parameter K are quadratic functions with the fiber reinforcement index, and the parameter n is less affected by the fiber reinforcement index. The prediction curve of the modified model can accurately reflect the real shear characteristics of reinforced tailings and provide theoretical guidance and prediction analysis for its application in roadbed engineering. |
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