EICP与木质素联合改性粉土边坡抗雨蚀试验研究

通过设置6组试样，采用降雨试验，通过试样的表面侵蚀状况与冲蚀量、表面强度、碳酸钙含量的变化分析了改性后粉土边坡的抗雨蚀性能。试验结果表明：植物源酶诱导碳酸钙沉淀(EICP)与木质素联合改性试样并在表面喷洒EICP溶液后，试样表面完整度更好，表面强度及碳酸钙含量更高，质量损失更小，抗雨蚀能力明显提高，与其他试样的平均值相比，边坡土体侵蚀量降低了75.0%,表面强度提高了33.8%,碳酸钙含量提高了235.2%;坡面喷洒EICP溶液可形成硬壳层，有效避免坡面侵蚀；木质素可为碳酸钙提供成核位点，使分布散乱的碳酸钙附着在木质素上，添加木质素后试样碳酸钙含量提高，且表面强度随碳酸钙含量提高而增大。

Experimental study on resistance of EICP and lignin joint-modified silt slope to rain erosion

By setting up six groups of specimens and using the rainfall test, the resistance of modified silt slopes to rain erosion was analyzed through the changes in the surface erosion condition of specimens with respect to the amount of erosion, surface strength and calcium carbonate content. The results show that after spraying the enzyme induced carbonate precipitation (EICP) solution on the surface for EICP and lignin joint-modified samples, the surface integrity is better, the strength and calcium carbonate content are higher, the quality loss is smaller, and the resistance to rain erosion is improved obviously. As results, the erosion amount of the slope soil is reduced by 75.0% on average compared with other specimens, the surface strength is increased by 33.8% on average, and the calcium carbonate content is increased by 235.2% on average. The slope surface sprayed with EICP solution can form a hard shell layer that effectively avoids the erosion of the slope surface, while lignin can provide nucleation sites for the calcium carbonate. Therefore, the distribution of scattered calcium carbonate attaches to lignin, so that the addition of lignin improves the calcium carbonate content and the surface strength also increases with the increase of calcium carbonate content.