脲酶矿化协同纤维加筋固化风积沙复合侵蚀试验研究

Experimental Study on Combined Erosion of Aeolian Soil Solidified by Enzyme Induced Carbonate Precipitation and Fibers

摘要: 风积沙结构松散，颗粒间无粘聚力，承载力和工程性质较差，不宜直接作为风积沙路堤基床底层填料。本文以毛乌素沙漠风积沙为研究对象，采用大豆脲酶协同玄武岩纤维和羊毛纤维固化风积沙，开展紫外线照射、冻融循环、风力侵蚀复合侵蚀条件下固化风积沙的抗侵蚀性能试验。通过侵蚀后固化风积沙试样的表观分析、质量损失分析以及风蚀模数变化情况分析，探讨不同固化条件下风积沙试样的抗侵蚀性能。结果表明：在紫外–冻融交替侵蚀下，固化风积沙试样表面经过粗糙–孔洞–裂纹–凹陷等表观变化过程；随着侵蚀周期的增加，固化风积沙试样风蚀模数逐渐变大；风蚀模数的变化率随侵蚀周期的增多不断增大，且增长幅度逐渐减低；纤维的加入能够改善EICP固化风积沙的力学性能以及提高其耐久性，且羊毛纤维的加筋效果优于玄武岩纤维。

Abstract: Aeolian sand has a loose structure, no cohesive force between particles, poor bearing capacity and engineering properties, and is not suitable as a filling material for embankment foundations. This article takes the aeolian sand in the Mu Us Desert as the research object, and uses soybean urease combined with basalt fiber and wool fiber to solidify aeolian sand. The anti erosion performance of solidified sand is tested under the conditions of ultraviolet irradiation, freeze-thaw cycle, and wind erosion. By analyzing the appearance, quality loss, and wind erosion modulus changes of solidified sand after erosion, the erosion resistance properties of samples are studied under different conditions. The results indicate that under the alternating erosion of UV and freeze-thaw, the surface of the solidified sample undergoes apparent changes such as roughness, pores, cracks, and depressions. As the erosion cycle increases, the wind erosion modulus gradually increases, while the growth rate gradually decreases; The addition of fibers can improve the mechanical properties and durability of solidified samples, and the reinforcement effect of wool fibers is better than that of basalt fibers.