Effective use of microbes in waste soil stabilisation considering natural temperature variations

IF 1.7 Q3 ENGINEERING, GEOLOGICAL

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-09-27 DOI:10.1080/17486025.2021.1981465

B. Mir, K. M. N. S. Wani

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引用次数: 2

Abstract

ABSTRACT Dredged soils are waste deposits left unutilised in huge quantities. In order to effectively utilise such weak deposits, proper improvement techniques need to be adopted. In this study, four different bacillus microbes namely Bacillus pasteurii, Bacillus megaterium, Bacillus sphaericus and Bacillus subtilis along with cementing solution at different molarities (0.5 and 1 CSM) have been incorporated into the soil at an optical density of 1.5 (108 cells/ml). Unconfined compressive strength (UCS) and permeability tests have been performed on the soil samples. The samples were provided treatment (48 h) and curing (7 and 14 days) in natural conditions. The UCS test results at 0.5 CSM and 7 days curing revealed a noticeable enhancement. Permeability reduced by one order at 14 days of curing and 1 CSM. Three different ranges of temperature depending upon natural climatic variations were designated for testing, and it was concluded that 18–23°C was the optimum temperature for all the treatment processes. This study puts forth the importance of green eco-friendly technology in improving dredged soils from wetland peripheries thus helping indirectly in restoring its balance. Scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS) provided conclusive support to the experimental investigations.

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考虑自然温度变化的废土壤稳定中微生物的有效利用

摘要疏浚土是大量未利用的废弃沉积物。为了有效利用这些薄弱矿床，需要采用适当的改良技术。在本研究中，四种不同的芽孢杆菌微生物，即巴氏芽孢杆菌、巨型芽孢杆菌、球形芽孢杆菌和枯草芽孢杆菌，以及不同摩尔浓度（0.5和1 CSM）的胶结溶液，以1.5的光密度（108个细胞/ml）掺入土壤中。对土壤样品进行了无侧限抗压强度（UCS）和渗透性试验。在自然条件下对样品进行处理（48小时）和固化（7天和14天）。在0.5CSM和7天固化条件下的UCS测试结果显示出明显的增强。在固化14天和1个CSM时，渗透性降低了一个数量级。根据自然气候变化，指定了三个不同的温度范围进行测试，得出的结论是，18-23°C是所有处理过程的最佳温度。本研究提出了绿色环保技术在改善湿地周边疏浚土壤方面的重要性，从而间接帮助恢复其平衡。扫描电子显微镜（SEM）和能谱仪（EDS）为实验研究提供了确凿的支持。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomechanics and Geoengineering-An International Journal ENGINEERING, GEOLOGICAL-

CiteScore

3.80

自引率

0.00%

发文量

期刊介绍： Geomechanics is concerned with the application of the principle of mechanics to earth-materials (namely geo-material). Geoengineering covers a wide range of engineering disciplines related to geo-materials, such as foundation engineering, slope engineering, tunnelling, rock engineering, engineering geology and geo-environmental engineering. Geomechanics and Geoengineering is a major publication channel for research in the areas of soil and rock mechanics, geotechnical and geological engineering, engineering geology, geo-environmental engineering and all geo-material related engineering and science disciplines. The Journal provides an international forum for the exchange of innovative ideas, especially between researchers in Asia and the rest of the world.