玄武岩纤维加筋黄土动力特性试验研究

Experimental Study on Dynamic Characteristics of Basalt Fiber Reinforced Loess

摘要: 为了分析玄武岩纤维加筋黄土的动力特性，通过开展动荷载作用下三轴固结不排水剪切试验，针对含水率为13%的加筋土试样，分析纤维长度、纤维含量、围压及循环应力比等因素对玄武岩纤维加筋黄土抗剪强度的影响得出结论，随着纤维长度的增加，纤维加筋土的动强度随之增加，且加筋土强度明显高于素土。当纤维长度一定时，随着纤维含量的提高，纤维分布更加均匀，受力更加稳定。随着围压的增加，纤维加筋土的动强度逐渐提高。在不同循环应力比下，素土与纤维加筋土的动应变均表现不同状态。且当循环应力较大时，素土与纤维加筋土的破坏时间也大大缩减。结合试验结果得出，动荷载下玄武岩纤维加筋土的最优长度为16 mm，最优含量为0.8%。上述研究对于提升黄土强度有重要参考价值。

Abstract: In order to analyze the dynamic characteristics of basalt fiber reinforced loess, a triaxial consolidated undrained shear test was carried out under dynamic load to analyze the effects of fiber length, fiber content, confining pressure and cyclic stress ratio on the shear strength of basalt fiber reinforced loess with a water content of 13%. The results showed that with the increase in fiber length, the dynamic strength of fiber reinforced soil is increased, and the strength of reinforced soil is obviously higher than that of plain soil. When the fiber length is fixed, the fiber distribution is more uniform and the force is more stable with the increase in fiber content. With the increase in confining pressure, the dynamic strength of fiber reinforced soil increases gradually. Under different cyclic stress ratios, the dynamic strain of plain soil and fiber reinforced soil is different. When the cyclic stress is high, the failure time of plain soil and fiber reinforced soil is reduced greatly. Combined with the test results, the optimal length of basalt fiber reinforced soil under dynamic load is 16 mm and the optimal content is 0.8%. The above research has important reference value for improving loess strength.