Stabilization of weak soil can be achieved through different methods, some of which include jet column, cement stabilization and fly ash stabilization. Unfortunately, the use of the aforementioned methods of soil improvement affects the environment negatively thereby leading to environmental degradation. With the aforesaid impediment in mind, the need for devising methods of weak soil improvement becomes pertinent. Bacillus sp. — a non-pathogenic organism found abundantly in soil — was investigated in this study as a potential agent of soil improvement. The usability of Bacillus sp. in soil improvement was investigated with direct shear tests and permeability tests under optimum conditions in this study. Time-dependent study on the effect of the ureolytic bacteria Bacillus sp.-induced calcium carbonate precipitation shows reduction in permeability and increase in the strength of the soil under study. On exhaustion of the available nutrients in the soil, however, the strength of the soil is not negatively impacted. Microbially induced calcium precipitation by Bacillus sp. is effective in soil improvement as such it may serve as substitute for conventional soil stabilization techniques. The ability of the bacteria to precipitate calcium carbonate in the soil leads to reduction in the permeability and increase in the shear strength of the soil.

中文翻译：

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一种微生物碳酸盐沉淀改善砂土工程性质的实验方法

可以通过不同的方法实现弱土的稳定，其中一些方法包括喷射柱、水泥稳定和粉煤灰稳定。不幸的是，使用上述土壤改良方法会对环境产生负面影响，从而导致环境退化。考虑到上述障碍，设计弱土壤改良方法的必要性就变得很重要。芽孢杆菌 - 在土壤中大量发现的非病原生物 - 在本研究中作为土壤改良的潜在因素进行了调查。芽孢杆菌的可用性。在本研究中，在最佳条件下通过直接剪切试验和渗透试验研究了土壤改良。对尿素分解细菌芽孢杆菌的影响的时间依赖性研究。诱导的碳酸钙沉淀显示出所研究土壤的渗透性降低和强度增加。然而，当土壤中的可用养分耗尽时，土壤的强度不会受到负面影响。芽孢杆菌属微生物诱导的钙沉淀。在土壤改良方面是有效的，因此它可以作为传统土壤稳定技术的替代品。细菌在土壤中沉淀碳酸钙的能力导致土壤渗透性降低和剪切强度增加。在土壤改良方面是有效的，因此它可以作为传统土壤稳定技术的替代品。细菌在土壤中沉淀碳酸钙的能力导致土壤渗透性降低和剪切强度增加。在土壤改良方面是有效的，因此它可以作为传统土壤稳定技术的替代品。细菌在土壤中沉淀碳酸钙的能力导致土壤渗透性降低和剪切强度增加。