脲酶诱导碳酸钙沉积固化砂土抗侵蚀机理研究
Study on the Erosion Resistance Mechanism of Aeolian Soil Solidified by Enzyme Induced Carbonate Precipitation

EICP技术可通过脲酶水解尿素，诱导形成碳酸钙晶体、将分散的土体颗粒胶结形成整体，从而改善风积沙的性能。本文采用EICP技术联合纤维固化风积沙，探讨固化风积沙在紫外侵蚀与冻融循环侵蚀下的作用机理。试验结果表明：EICP协同纤维加筋固化后的风积沙出现较多的碳酸钙衍射峰，表明纤维的加入有利于碳酸钙生成。在紫外线的照射下CaCO₃晶体出现多孔现象，弱化CaCO₃的胶结能力，孔隙越多试样强度下降越快。在冻结过程中，试样内部产生的冻胀力对砂颗粒产生挤压，导致试样出现裂纹甚至断裂的现象。
EICP technology can improve the performance of aeolian sand by hydrolyzing urea with urease, inducing the formation of calcium carbonate crystals, and bonding dispersed soil particles into a whole. This article uses EICP technology combined with fiber solidification of aeolian sand to explore the mechanism of action of solidified aeolian sand under UV erosion and freeze-thaw cycle erosion. The experimental results show that after EICP treatment and fiber reinforcement, the aeolian sand exhibits more calcium carbonate diffraction peaks, indicating that the addition of fibers is conducive to the formation of calcium carbonate. Under ultraviolet irradiation, CaCO₃ crystals exhibit porosity, weakening the bonding ability of CaCO₃. The more pores there are, the faster the strength of the sample decreases. During the freezing process, frost heave force is generated inside the sample, which compresses the sand particles and causes cracks or even fractures in the sample.