Yi Fu, Du Changbo
China Coal Research Institute, Beijing 100013, China.
College of Civil Engineering, Liaoning Technical University, Fuxin 123000, China.
Materials (Basel). 2020 Apr 20;13(8):1943. doi: 10.3390/ma13081943.
To evaluate the shear properties of geotextile-reinforced tailings, triaxial compression tests were performed on geogrids and geotextiles with zero, one, two, and four reinforced layers. The stress-strain characteristics and reinforcement effects of the reinforced tailings with different layers were analyzed. According to the test results, the geogrid stress-strain curves show hardening characteristics, whereas the geotextile stress-strain curves have strain-softening properties. With more reinforced layers, the hardening or softening characteristics become more prominent. We demonstrate that the stress-strain curves of geogrids and geotextile reinforced tailings under different reinforced layers can be fitted by the Duncan-Zhang model, which indicates that the pseudo-cohesion of shear strength index increases linearly whereas the friction angle remains primarily unchanged with the increase in reinforced layers. In addition, we observed that, although the strength of the reinforced tailings increases substantially, the reinforcement effect is more significant at a low confining pressure than at a high confining pressure. On the contrary, the triaxial specimen strength decreases with the increase in the number of reinforced layers. Our findings can provide valuable input toward the design and application of reinforced engineering.
为评估土工织物加筋尾矿的抗剪性能，对设置了零层、一层、两层和四层加筋层的土工格栅和土工织物进行了三轴压缩试验。分析了不同层数加筋尾矿的应力应变特性及加筋效果。试验结果表明，土工格栅应力应变曲线呈现硬化特性，而土工织物应力应变曲线具有应变软化特性。加筋层数越多，硬化或软化特性越显著。研究表明，不同加筋层数下土工格栅和土工织物加筋尾矿的应力应变曲线可用邓肯-张模型拟合，这表明随着加筋层数增加，抗剪强度指标的似粘聚力呈线性增加，而摩擦角基本不变。此外，研究发现，尽管加筋尾矿强度大幅提高，但低围压下的加筋效果比高围压下更显著。相反，三轴试件强度随加筋层数增加而降低。我们的研究结果可为加筋工程的设计和应用提供有价值的参考。
