天然椰糠粉增强陕西娄土持水性能研究

Enhanced performance of natural coconut powder for the water retention capacity of Shaanxi Lou soil

以天然椰糠粉为保水剂,研究其对陕西娄土土壤持水能力的增强效应。结果表明,椰糠粉表现出良好的反复吸水性;在较高温度下,椰糠粉仍具有较好的持水性;椰糠粉/陕西娄土混合物的含水量随着椰糠粉比例的增加而增大,含质量分数10%,25%的椰糠粉/陕西娄土混合物在5 k Pa压力吸力下,保持的最低含水量分别增加了127%和274%,Van Genuchten模型拟合数据中参数α从原来的0.397减小至3.90×10-8和1.60×10-8,表明椰糠粉显著增强了陕西娄土土壤持水能力。

Waste coconut bran powder have been used as a novel and natural water-retaining agent to in-vestigate the enhancement of water holding capacity for Shaanxi Lou soil. The result showed that the re-peated swelling test of coconut powder indicated that they had excellent recycle performance for the water retention. Moreover, coconut powder still exhibited a good water binding capacity at a high temperature. The water content of coconut bran powder/Lou soil mixture increased as the proportion of coconut powder increased under the same matrix suction in soli water characteristic curves. Under pressure of 5 kPa,the lowest water content of coconut bran powder/Lou soil mixture with 10% and 25% coconut bran powder were increased by 127% and 274% respectively, in comparison with the pure Lou soil. The parameter a in the Van Genuchten model is reduced from the original 0. 397 to 3.90 ×10 ^-8 and 1. 60 × 10^-8. All of these showed that the coconut bran powder significantly enhanced the water holding capacity of Shaanxi Lou soil.