Soil Compressibility as Influenced by Sewage Sludge Incorporation
Soil Compressibility as Influenced by Sewage Sludge Incorporation
复制标题
污泥掺入对土壤压缩性的影响
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
E. Ekwue
中科院分区：
文献类型：
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作者：
R. J. Stone;E. Ekwue
摘要 在 0 至 1000 kPa 的应力范围内，研究了掺入污水污泥对特立尼达四种农业土壤压缩性的影响。将风干污水污泥按四种水平（干土质量的 0%、4%、8% 和 12%）施用于土壤（两种沙壤土、粘壤土和粘土），并在其最佳压实含水量下进行测试。每种土壤的压缩曲线（空隙率与对数施加应力）在施加应力范围内几乎呈线性。所有土壤在四个代表性应力水平下的孔隙比平均值随着污水污泥含量的增加而增加，并随着施加应力和粘土含量的增加而减少。实验因素之间观察到显着的交互作用，其中土壤类型和施加应力之间的交互作用最为显着。在所有情况下，污水污泥都会增加土壤的压缩性。土壤压缩性使用两个压缩指数进行量化：C c 定义为空隙率与对数施加应力的斜率，C 定义为容重与对数施加应力的斜率。 C c 和 C 随着污水和粘土含量的增加而增加，但 C c 被认为是更敏感的指标，特别是在 10-100 kPa 应力范围内。导出了一个方程，将 C c 与压缩前的初始堆积密度 (ρ i )、颗粒密度 (ρ s )、应变差 (e 2 -e 1 ) 以及相应的外加应力（σ 1 和 σ 2 ）联系起来。方程为 C c =( ρ s ( e 2 - e 1 ))/ (ρ i log (σ 2 / σ 1 ))。
Abstract The effect of incorporating sewage sludge on the compressibility of four Trinidadian agricultural soils was investigated over a range of stresses from 0 to 1000 kPa. Air-dried sewage sludge was applied at four levels (0, 4, 8 and 12% by mass of dry soil) to the soils (two sandy loams, clay loam and clay) and these were tested at their optimum compaction moisture contents. Compression curves (void ratio versus log applied stress) for each soil were almost linear over the range of applied stress. Mean values of void ratio for all soils at four representative stress levels increased with increasing sewage sludge content and decreased with increasing applied stress and clay content. Significant interaction effects were observed between the experimental factors, with the interaction effect between soil type and applied stress being the most significant. Sewage sludge increased soil compressibility in all cases. Soil compressibility was quantified using two compression indices: C c defined as the slope of void ratio versus log applied stress and C defined as the slope of bulk density versus log applied stress. C c and C tended to increase with increasing sewage and clay contents, but C c was identified as the more sensitive index, particularly in the 10-100 kPa stress range. An equation was derived to relate C c to initial bulk density before compression (ρ i ), particle density (ρ s ), strain difference (e 2 -e 1 ) and the corresponding applied stresses (σ 1 and σ 2 ). The equation is C c =( ρ s ( e 2 - e 1 ))/ (ρ i log (σ 2 / σ 1 )) .