基于生物增产的MICP方法稳定碳酸盐砂的初步研究

Yijie Wang, Ningjun Jiang, Xiaole Han
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引用次数: 1

摘要

微生物诱导方解石降水(microbiological Induced Calcite Precipitation, MICP)是一种通过生物强化或生物刺激来改善软弱沙质土壤的方法。与生物增强法相比,生物刺激法具有更大的优势,因为本地微生物更容易存活并有效地产生MICP。本文通过一系列柱富集试验和土壤直剪试验,初步探讨了生物胶结碳酸盐砂的生物刺激机理和抗剪强度特性。首先用含有营养液和尿素的富集介质处理碳酸盐砂,然后用含有尿素和氯化钙的胶结液处理碳酸盐砂。处理后,在25 kPa、50 kPa、100 kPa、200 kPa四种正应力下进行直剪试验。结果表明,土质中可有效富集原生解尿菌,显著提高土质抗剪强度。模型在本文中并不适用,有必要建立一个更精确的非线性模型。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A preliminary study of carbonate sand stabilization by bio-stimulation based MICP method
Microbiologically Induced Calcite Precipitation (MICP) has been proposed to improve the weak sandy soil ground via bio-augmentation or bio-stimulation. Compared with bio-augmentation, bio-stimulation approach has more advantages since indigenous microbes are more likely to survive and effectively generate MICP. This paper reports a preliminary experimental study of investigating the mechanism of bio-stimulation and shear strength behavior of biocemented carbonate sand via a series of column enrichment and soil direct shear tests. The carbonate sand was firstly treated by enrichment media containing nutrient solution and urea, and then treated by cementation solution containing urea and calcium chloride. After treatment, direct shear tests were conducted under four normal stress (25 kPa, 50 kPa, 100 kPa and 200 kPa). The results indicate that indigenous ureolytic bacteria can be enriched in soil effectively, and the shear strength can be improved significantly. model is not applicable here in this paper, and it is necessary to develop a more accurate non-linear model.
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