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| 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： |
| 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(51774163)；辽宁省教育厅青年基金资助项目(LJKQZ2021153)；辽宁工程技术大学首批“双一流”学科建设创新团队资助(LNTU20TD-26) |
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| 中文摘要: |
| 为了研究聚丙烯纤维加筋尾矿作为路基填料的可行性,采用直剪试验机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%,受纤维掺量影响加筋尾矿内摩擦角的变化幅度在5°之间；随含水率增大,纤维加筋尾矿黏聚力呈现先增大后减小趋势,最优含水率为7%；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,它与黏聚力的关系呈现幂函数特点,对于内摩擦角的影响微乎其微。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Rf、参数K与纤维加筋指数呈现二次函数特征,参数n受纤维加筋指数影响较小。修正后的模型预测曲线可准确反应加筋尾矿的真实剪切特性,对其在路基工程中应用提供理论指导和预测分析。 |
| 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 direct shear test machine. 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. The optimal content is 0.3 %. The variation range of internal friction angle of reinforced tailings affected by fiber content is between 5 °. With the increase of moisture content, the cohesion of fiber reinforced tailings increased first and then decreased, and the optimal moisture content was 7 %. The fiber reinforcement coefficient can reflect the influence of fiber content and water content on the reinforcement effect. Its relationship with cohesion shows power function characteristics, and its influence on internal friction angle is minimal. The Duncan-chang model was modified according to the direct shear test results, and the mathematical relationship between the model parameters and the fiber reinforcement coefficient was established. The failure ratio Rf, parameter K and the fiber reinforcement coefficient showed quadratic function characteristics, and the parameter n was less affected by the fiber reinforcement coefficient. The modified model prediction curve 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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