Rasheed Romana Mariyam, Moghal Arif Ali Baig, Basha B Munwar, Almajed Abdullah
Department of Civil Engineering, TKM College of Engineering, Kollam, 691005, India.
Department of Civil Engineering, National Institute of Technology Warangal, Warangal, 506004, India.
Sci Rep. 2024 Jun 20;14(1):14202. doi: 10.1038/s41598-024-64408-7.
The current study investigated the primary and secondary compressibility characteristics of organic clay with two biopolymers, Chitosan (D) and Casein (D) at dosages of 0.5%, 1%, 2%, and 4%. The primary compression index (C) values were reduced by 18% and 59% at dosage (D and D) of 4% at a consolidation pressure of 800 kPa. The secondary compression indices of chitosan and casein-treated soils fell below the normal range specified for organic soils and lay in the range of 0.01-0.017. The biopolymers also accelerated the consolidation process at all dosages (D) and 2% D. The hydraulic conductivity increased for all dosages of chitosan whereas it declined for all dosages of casein compared to untreated soil. The reliability analysis was conducted for biopolymer-treated soils and presented a rational approach toward the selection of a suitable liner. Chitosan failed to achieve a target reliability index of 3 whereas casein-amended samples attained values equal to and greater than 3 at all dosages and consolidation pressures at COV of K = 20%. At all dosages, the casein-treated soils exhibited reliability index values greater than 3 up to COV of K = 40% indicating the higher stability of casein mixes as a liner material.
本研究调查了两种生物聚合物壳聚糖（D）和酪蛋白（D）在0.5%、1%、2%和4%剂量下对有机粘土的一次和二次压缩特性。在800 kPa的固结压力下，4%剂量（D和D）时一次压缩指数（C）值分别降低了18%和59%。壳聚糖和酪蛋白处理土壤的二次压缩指数低于有机土壤规定的正常范围，在0.01 - 0.017范围内。生物聚合物在所有剂量（D）和2% D时也加速了固结过程。与未处理土壤相比，壳聚糖所有剂量下的水力传导率均增加，而酪蛋白所有剂量下的水力传导率均下降。对生物聚合物处理的土壤进行了可靠性分析，并提出了一种选择合适衬垫的合理方法。壳聚糖未能达到目标可靠性指数3，而酪蛋白改良样品在K的变异系数为20%时，在所有剂量和固结压力下均达到或大于3的值。在所有剂量下，酪蛋白处理的土壤在K的变异系数高达40%时均表现出大于3的可靠性指数值，表明酪蛋白混合物作为衬垫材料具有更高的稳定性。
