冻融循环作用下秸秆纤维加筋土抗压强度试验研究

通过室内无侧限抗压试验,分析纤维掺量和冻融循环次数两个因素对棉花秸秆纤维加筋土强度的影响规律,研究冻融循环作用对纤维加筋土强度的影响。试验结果表明:土体中掺入纤维能有效提高土体的抗压强度,明显改善土体的软化程度;加筋土无侧限抗压强度随冻融循环次数的增加呈指数下降趋势,经历5次冻融后,强度下降幅度最大;通过将不同加筋率的纤维土与冻融循环次数进行拟合,建立两者之间的半经验公式,为纤维加筋土的实际工程应用奠定理论基础。

Experimental Study on Compressive Strength of Straw Fiber-reinforced Soil Under Freeze-thaw Cycles

Through indoor unconfined compression test, the influence of fiber content and freeze-thaw cycles on the strength of cotton straw fiber reinforced soil was analyzed, and the influence of freeze-thaw cycles on the strength of fiber reinforced soil was studied. The test results show that the incorporation of fiber into the soil can effectively increase the compressive strength of the soil and significantly improve the softening degree of the soil. The unconfined compressive strength of reinforced soil decreases exponentially with the increase of the number of freeze-thaw cycles, and the strength decreases the most after 5 freeze-thaw cycles. The semi-empirical formula between the fiber-reinforced soil with different reinforcement ratio and the number of freeze-thaw cycles is established, which lays a theoretical foundation for the practical engineering application of fiber-reinforced soil.