用天然生物聚合物改良的压实膨胀土的流动和体积变化行为

Ahmed Bukhary, S. Azam
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摘要

天然生物聚合物具有惰性、用量少、可在常温下使用等特点,因此是一种可持续的土壤改良替代品。本研究评估了天然生物聚合物在压实过程中改善膨胀性土壤的功效,即使用 0.5% 用量的阳离子壳聚糖、电荷中性瓜尔胶和阴离子黄原胶。实验室研究结果表明,膨胀土的流动性和体积变化特性受到了不同程度的影响。壳聚糖和瓜尔胶(AEV 值为 200 kPa)可修复土壤的双重孔隙度,即聚结间孔隙导致的低空气进入量(AEV1 为 4 kPa)和粘土基质导致的高空气进入量(AEV2 为 200 kPa),但黄原胶(AEV1 为 100 kPa,AEV2 为 200 kPa)可增强这种双重孔隙度。土壤的 s 型膨胀收缩路径包括结构阶段(e 值从 1.23 到 1.11)、正常阶段(e 值从 1.11 到 0.6)和残余阶段(e 值从 0.6 到 0.43)。通过使用壳聚糖和瓜尔豆胶进行改良,这种形状被转换成了 "j "形路径,e 值从约 1.25 到 0.5,没有显示出结构体积的变化,但黄原胶将其还原成了更明显的形式,三个阶段的 e 值分别从 1.5 到 1.32、1.32 到 0.49 以及 0.49 到 0.34。土壤的固结行为基本不受生物聚合物添加量的影响,在空隙率从 1.1 降至 0.6 的过程中,饱和导水性从 10-9 m/s 降至 10-12 m/s。在座落应力为 5 千帕时,由于添加了壳聚糖,土壤的膨胀势(7.8%)略微下降到 6.9%,但添加瓜尔豆胶和黄原胶后,膨胀势分别上升到 9.4% 和 12.2%。壳聚糖和瓜尔豆胶的使用将使所调查的膨胀性土壤的压实度达到最佳干度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Flow through and Volume Change Behavior of a Compacted Expansive Soil Amended with Natural Biopolymers
Natural biopolymers offer a sustainable alternative for improving soil behavior due to their inert nature, small dosage requirement, and applicability under ambient temperatures. This research evaluates the efficacy of natural biopolymers for ameliorating an expansive soil by using a 0.5% dosage of cationic chitosan, charge-neutral guar gum, and anionic xanthan gum during compaction. The results of laboratory investigations indicate that the flow through and volume change properties of the expansive soil were affected variably. The dual porosity, characterized by low air entry due to inter-aggregate pores (AEV1 of 4 kPa) and high air entry due to the clay matrix (AEV2 of 200 kPa) of the soil, was healed using chitosan and guar gum (AEV of 200 kPa) but was enhanced by the xanthan gum (AEV1 of 100 kPa and AEV2 of 200 kPa). The s-shaped swell–shrink path of the soil comprised structural (e from 1.23 to 1.11), normal (e from 1.11 to 0.6), and residual stages (e ranged from 0.6–0.43). This shape was converted into a j-shaped path through amendment using chitosan and guar gum, showing no structural volume change, with e from about 1.25 to 0.5, but was reverted to a more pronounced form by xanthan gum, with e from 1.5 to 1.32, 1.32 to 0.49, and 0.49 to 0.34 in the three stages, respectively. The consolidation behavior of the soil was largely unaffected by the addition of biopolymers such that the saturated hydraulic conductivity decreased from 10−9 m/s to 10−12 m/s over a void ratio decrease from 1.1 to 0.6. At a seating stress of 5 kPa, the swelling potential (7.8%) of the soil slightly decreased to 6.9% due to the addition of chitosan but increased to 9.4% and 12.2% with guar gum and xanthan gum, respectively. The use of chitosan and guar gum will allow the compaction of the investigated expansive soil on the dry side of optimum.
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